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堀 利文, 塚田 吉昭, 平田 信行
1995 年 15 巻 Supplement1 号 p.
193-196
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
Once again, the recent trend of super high-speed ships is to use a Power-Augmented Ram Wing In Surface Effect Ship(=PAR-WISES). APAR-WISES is a wing in free-surface effect, whose lift is enhanced by using the air flow of a thruster, which is placed upstream of the wing, so as to create a high pressure region under the wing. The PAR effects enable the vehicle to take off and land at lower speed and the structual weight and engine power can be reduced compared with conventional WISES.
In order to understand the mechanism of PAR effects, measurements of pressure distribution on the lower surface of the wing and the ground, flow visualization for a low aspect ratio wing with end plates were performed in the wind tunnel at the Ship Research Institute. Aerodynamic characteristics and interactions among the wing, ground and thruster are discussed.
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松尾 繁, ツォイチィウス ミヒャエル, 中野 智弘, 瀬戸口 俊明, 金子 賢二
1995 年 15 巻 Supplement1 号 p.
197-200
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
In recent year, research and development activities for next generation supersonic transport are being car-ried out actively by the world aeronautical community. In a supersonic intake, a cavity plays an important role in the control of shock waves. The study of the supersonic internal flow with the cavity is important not only for resarch on industrial applications but also for basic research in gasdynamics. In the present study, the supersonic internal flow with cavities was investigated experimentally by a schlieren optical method and pressure measurements in the case of the flow Mach number 1.9 at the cavity entrance. The effects of configurations of cavity leading edge and porous wall on the flow-induced pressure oscillation were clarified qualitatively.
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黒杭 保久, 青山 俊治, 渡辺 則彦, 前野 一夫, 本間 弘樹
1995 年 15 巻 Supplement1 号 p.
201-204
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
In order to obtain small density variations in flow field, an image processing system for analyzing interferograms is developed. A Mach-Zehnder interferometer is used for visualization of flow field, and images are directly taken by a CCD-camera. The image is displayed immediately after each shot, and processed on a personal computer. Using this system, weak shock waves in carbon dioxide are observed for incident shock Mach number 1.02 to 1.06 and initial pressure 147 to 196 kPa. This paper presents the detail of density distribution of flow fields, which are generated by weak shock waves, passing over a hemicylinder and reflecting from wedges, in carbon dioxide.
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井上 雅弘, 益田 光治, 古川 雅人, 村石 隆
1995 年 15 巻 Supplement1 号 p.
205-208
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
To investigate the turbulence in the transonic flow field with shock wave-boundary layer interactions, the laser-induced fluorescence (LIF) method is developed. This diagnostic system is based on the argon laser with seeded iodine as fluorescence material. The photomultiplier is used as a fluorescence detector to obtain high temporal resolution. The effect of the detector noise due to the photon statistics is investigated, and it is shown that the distribution of the temperature fluctuation in the transonic duct is measured by this method.
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棚橋 真左夫, 川橋 正昭, 平原 裕行
1995 年 15 巻 Supplement1 号 p.
209-212
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
The phenomena described in this paper are concerned with air-column oscillation induced by acoustic standing wave in a closed duct driven by a sound source. When the driving frequency is in the vicinity of the resonance frequency of the air-column, a large amplitude oscillatory flow is produced in the duct. According as an increase of the amplitude, steady pressure distribution, steady streaming and thermoacoustic effect appear in addition to the oscillatory fluid motion in the duct. The steady streaming, which is called Rayleigh's acoustic streaming caused by frictional dissipation in the Stokes layer, results in circulating flows within each segment of 1/4 wave-length of the standing wave. When a strong acoustic standing wave is superimposed on the field of unstable convection generating in a horizontal duct by heating of duct floor, the coupling of acoustic streaming on the convection is capable of transforming it.
This paper describes experimental investigations on the coupling of the acoustic streaming with the natural convection developed in a rectangular duct. The results obtained show that the coupling of the sound field on the unstable convection not only transforms it into a stable convection with cellular structure characterized by the wave length of the sound, but also the velocity of convection current increases.
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渡邉 京司, 神谷 信彦
1995 年 15 巻 Supplement1 号 p.
213-216
発行日: 1995/07/01
公開日: 2009/07/31
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The characteristics of a steady axial flow around a stepped cylinder with small attack angle was investigated by means of the flow visualization technique of the smoke method at the Reynolds numbers less than 2×105. The experiments were carried out with the protrusion step length of the cylinder between -1.5mm and 16mm. The attack angle of cylinder model has an maximum value of 5 degrees. The pressure distributions on the cylinder surface were measured with respect to the two cases at the velocity of 15m/s and 30m/s.
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近江 和生
1995 年 15 巻 Supplement1 号 p.
217-220
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
The vortex wake generated behind circular cylinders in side-by-side arrangement is investigated by discrete vortex calculations in comparison to flow visualization experiments. The discrete vortex calculation is based on the inviscid fluid theory (Reynolds number at infinity) whereas the visualization experiment is conducted at Re numbers from 80 to 300. The cylinder spacing ratio Tld is varied between 1.5 and 4.0 in both cases. The topics of the study are biased flow phenomenon at Tld between 1.5 and 2.0, as well as phase interaction between upper and lower vortex streets usually observed at spacing ratios greater than 2.5.
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小川 雅弘, 山本 富士夫, 太田 淳一, 井口 学, 幸川 光雄
1995 年 15 巻 Supplement1 号 p.
221-224
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
The purpose of the present study is to measure and investigate unsteady flows inside and outside a hollow circular cylinder with sudden rotating and stopping in a uniform flow and finally in order to obtain some fundamental data about the virtual mass effect. The flows inside and outside a hollow cylinder which is made of transparent acrylic resin are visualized by the particle tracer technique and analyzed using the PIV technique based on the two-dimensional binary image cross-correlation method. As a result, the unsteady whole field flows are discussed.
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西尾 茂, 奥野 武俊
1995 年 15 巻 Supplement1 号 p.
225-228
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
The velocity distribution around a circular cylinder oscillated transversely in uniform flow was measured using an image measurement system. The external controllable VTR enables to obtain any image data on specified VTR frame, and automatic processing of image measurement. The conditional sampling and ensemble average are adopted to increase the spatio resolution.
The vortex shedding process under the lock-in phenomena was considered from the measured velocity and vorticity distribution. The anti-clockwise vortex shed at 0.42π<ωat<0.54π, and has small dissipation after the shedding.
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安部 静生, 鈴木 誠
1995 年 15 巻 Supplement1 号 p.
229-232
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
A visualization system was developed for the analysis of engine compartment flow. This system consists of mesh generation, calculation, and animation system. Analytical mesh was generated by a new method applying STAR-CD. This method made it possible to accurately define the object shape easier than conventional multi-block method. Fan model was developed by measuring the axial and rotational com-ponent of flow velocity behind fan blades. As the results, it was found that fan rotation has large effect on the engine compartment flow especially under low vehicle speed condition.
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黒田 成昭, 仙北谷 直美, 山崎 薫
1995 年 15 巻 Supplement1 号 p.
233-236
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
Flows around an elastic plate with a pitching motion in a uniform flow are visualized. The pitching motion is one cycle of oscillaion with constant angular velocity. The flow patterns are visualized by the tracer techniq using Al-pouder.
In the experriment, the amplitude and frequency of oscillaion, velocity of the uniform flow and the length and flexural rigidity of plate are changed. Flow patterns around a pitching elastic plate are compared with that of a rigid plate.
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高藤 圭一郎, 秋山 光庸, 杉山 均, 筒井 壽博
1995 年 15 巻 Supplement1 号 p.
237-240
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
The measuring method of the unsteady temperature field by using Mach-Zehnder interferometer was presented. In this study, an image processing techniqe assisted by computer has been constructed. And the analysis of the unsteady heat transfer around the vibrating plate has been performed under low Reynolds number experimentally. In the steady state, the experiment was compared with the calculated resulets, then it was found out this system had excuted properly. As a result of this study the heat transfer coefficient at vibrational condition increased 19 % respect to the steady state.
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亀岡 利行, 岡田 裕紀, 秋野 詔夫, 高瀬 和之, 久保 真治
1995 年 15 巻 Supplement1 号 p.
241-244
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
The report describes an experiment on natural convective heat transfer of silicone oil and water around a horizontal cylinder in a rectangular box and on the visualization of temperature distribution by the liquid-crystal suspension method. The natural convection around the heated cylinder in the box is effected by the thermal stratification and plume. Experimental results are summarized as follows: The Nusselt numbers on the heated horizontal cylinder are correlated with the Ra numbers. The reference fluid temperature on the heat transfer is determined from the thermal stratification in the box. The swaying motion of the thermal plume is effected by the stratification.
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鶴 大悟, 佐藤 泰, 班目 春樹, 岡本 孝司, 文沢 元雄, 菱田 誠
1995 年 15 巻 Supplement1 号 p.
245-248
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
In this study, buoyancy-driven exchange flow through a rectangular small opening with a vertical partition was investigated. In the helium-air exchange flow experiment, the exchange flow rate and the flow pattern around opening exit were simultaneously measured. Two flow-pattern were formed even in the same condition. In the water-brine exchange flow experiment, the exchange flow rate and the flow pattern in opening were simultaneously measured. Penetration and entrainment were visualized in the opening, which affect the exchange flow rate.
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高雄 信吾, 園田 克樹
1995 年 15 巻 Supplement1 号 p.
249-252
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
When a stratified fluid with a sharp double-diffusive interface is heated laterally, intrusive convection starts to form from the diffusive interface along the heated wall. This paper describes experimental investigation of the particular convection patterns by flow visualization. Two types of unique convection patterns were observed: one is streaklike convection pattern and the other is a wave convection pattern. Studies of the pictures. indicated that intrusive convection fluid are supplied from some fixed burst points naturally formed at the diffusive interface along the heated wall.
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坂元 美定, 功刀 資彰, 一宮 浩市
1995 年 15 巻 Supplement1 号 p.
253-256
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
Experimental and numerical flow visualizations were presented to study laminar mixed convection with flow reversal in the thermal entrance region of a horizontal channel. Flow reversal near the upper wall at the entrance region of the channel was visualized by a dye-injection method, and the mechanisms of flow reversal were discussed. The experimental results showed in coincident with the stream lines with three-dimensional numerical analysis. The effects of wall temperature and Reynolds number were also studied for the size of flow reversal region (i.e., the separation bubble).
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大場 正昭
1995 年 15 巻 Supplement1 号 p.
257-260
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
Video imaging techniques were used to measure concentration fluctuations including concentration spectra in the wake of a stack model and a rectangular building model using a high-speed video camera. From the experiments the following results were obtained. The image signals had linear relationships with gas concentrations for mean values. The distance extinction of laser light due to light scattering had negligible effects on the linearity under the experimental conditions. The video image spectra were also found to coincide well with those measured by a high-response hydrocarbon analyzer. The peak frequency in the wake existed in the range from several Hz to 20 Hz for the reference velocity of 1 m/s. For the standard deviation of image signals the linearities showed to decrease in comparison with those for mean values. A free stagnation point existed at the point of X/H=0.1 and Z/H=0.7 in the wake of the rectangular building model.
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岡本 孝司, O.G. PHILIP, Y.A. HASSAN
1995 年 15 巻 Supplement1 号 p.
261-264
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
The interaction between the flow and free surface was evaluated measuring the velocity distribution and surface movement simultaneously. The test section was a rectangular tank having a free surface. A rectangular nozzle was set near the free surface to form a quasi two-dimensional jet. The jet interacted with the free surface, causing the wavy free surface condition. The flow under the free surface was visualized by a laser light sheet and small tracer particles. With image processing techniques, the movement of the free surface and the movement of the particles were simultaneously measured from the recorded images, resulting in the velocity distributions and surface locations. Then, the interactions between the flow and free surface were evaluated using the form of turbulent energy and surface-related turbulent values. By increasing the turbulent energy near the free surface, the fluctuations of the free surface height and the inclination of the free surface were increased. The higher fluctuation of horizontal velocity was related to the higher surface position and negative inclination. The image processing technique is found to be very useful to evaluate the interaction between free surface and flow.
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小林 敏雄, 佐賀 徹雄, 瀬川 茂樹, 金 泰均, 甘 勝己, 李 〓〓
1995 年 15 巻 Supplement1 号 p.
265-268
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
A color image processing technique has been applid to measure the temperature on a wall cooled by a cold air jet. Temperature distribution on the wall was visualized by a thereto-sensitive liquid crystal sheet. To achieve the color image analysis, the optical characteristics affecting to the temperature measure-ments, e.g, intensity of refractive light, relative angle between camera, crys-tal sheet and illumination, media configurations between camera and the crystal sheet, were quantitatively evaluated. The reflected colors from the liquid crys-tal-sheet were captured through a 3-tips color TV camera and the temperature distribution was obtained through a neural network color-temperature calibration scheme. This color image analysis is capable of measuring the spatial distribu-tion of mean temperature on the wall.
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植村 知正, 井口 学, 吉本 元信, 木村 誠
1995 年 15 巻 Supplement1 号 p.
269-272
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
In order to identify binary patterns between a template pattern and given ines, a new and high speed algorithm is proposed by combining a binary image correlation coefficient and a simultaneous multiple processing algorithm. The correlation coefficient is derived analytically from a ordinary correlation coefficient. And the relation to a difference-accumulation method is also shown. The performance of the new method is examined by evaluating the coefficient between a 32x32-pixel template patten and various ones. It is found that the new method offers a quite reliable index and high speed performance by obtaining 20000 correlation coefficients per one second on a common personal computer.
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大場 謙吉, 池戸 重雄, 浦部 丈晴, 澤 賢一
1995 年 15 巻 Supplement1 号 p.
273-276
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
A laser-induced fluorescence (LIF) method was used to visualize and measure instantaneous velocity profiles in pulsatile water flow through a tapered U-bend of circular cross-section. Visualization of instantaneous velocity profiles across the tube was made at eight different phases in a period of the pulsatile flowrate waveform. Stereographs of instantaneous velocity profiles and instantaneous contours of equi-velocity in a tapered U-bend was obtained. As a result, it was found that at the outlet of the tapered tube the flow velocity gradient near wall was very steep, and in spite of this fact, some reverse flow appeared near the inner wall of the tapered U-bend at the deceleration phase in the pulsatile flow.
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進藤 章二郎
1995 年 15 巻 Supplement1 号 p.
277-280
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
Wind tunnel testing in general is described for those who are not familiar with this field of engineering. Wind tunnels are grouped according to the testing speeds, test section geometry and configurations, and tunnel circuit shapes. Similality laws of and problems in wind tunnel testings are presented. Types of testings conducted in wind tunnels are described. The future of wind tunnel testing is briefly discussed.
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森島 弘吉
1995 年 15 巻 Supplement1 号 p.
281-284
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
Consideration of wind-resisting properties constitutes one of the key factors in design of long and large structures. As well as the static strength analysis, the dynamic effects of the wind must be taken into consideration in the windresisting design for structures. A wind tunnel is be used for testing the resistance and the aero-dynamic performance of long span bridge, high rise building, steel and offshore structures.etc.
This paper describes the outline of the low-speed wind tunnel facility for research and development of aerodynamic stabilities.
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松添 潤吾
1995 年 15 巻 Supplement1 号 p.
285-286
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
This experimental facility simulates accurately large-scale natural phenomena of the atomosphere above ocean and land.
This wind tunnel is a suction type and the test section is 1.5m wide by 1.2m high and 13.5m long. In order to produce thermally stratified flows, the tunnel has two independent temperature systems of thermal stratification unit(TSU) and heating and cooling floor panel unit(HCFU). The TSU heats up intake air flow at various proportions in the perpendicular direction and forms a thermal stratification air flow having various temperature gradients in the perpendicular direction. The HCFU performs heating and cooling of air flow from the floor surface in the test section by heating and cooling floor panels.
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深瀬 彊
1995 年 15 巻 Supplement1 号 p.
287-290
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
The component parts of the existing smoke wind tunnels are explained. Also, br iefly introduced the practically important points to plan or design the tunnels. It is indispensable to show the requirement of the users reasonably to the maker designer, for realizing the good performance of the installations.
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東島 鎮〓, 小野 洋彰
1995 年 15 巻 Supplement1 号 p.
291-294
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
Many instruments, called wind tunnel balance, are used for measuring aero-dynamic forces applied to model in wind tunnel.
Past, strain gage type load cells are only applied as supplementary maens of mecanical balance system. But recently, multi-component load cell are used most of force measuring in wind tunnel test.
In future, we will be possible to use them in various fields where we can not apply now.
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山越 一男
1995 年 15 巻 Supplement1 号 p.
295-298
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
Explanation For Accessorirs Of Wind-Tunnel. Lattice, Spire, Roughness Blocks, Gust-Equipment, Ajustable-Ceilling, Sting-&-Strut, Trverse-Equipment, & Others.
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中村 卓哉, 三浦 善男
1995 年 15 巻 Supplement1 号 p.
299-300
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
Moving belt is known as effectual ground simulation method. It is applied some wind-tunnel test, especialy racing car, but it is not populer to other case.
This paper introduce the present condition of moving belt system, and consider the technical problem in developping the system.
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日比 一喜, 菊地 浩利, 嶋田 健司
1995 年 15 巻 Supplement1 号 p.
301-304
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
Wind resistance design on structure flame, glass and cladding requires a knowledge of the wind load to act on the building by flow disturbances in the incident flow and generated by the building itself. On high rise building the wind tunnel experiment has been carried out to obtain the design load in the boundary layer in typhoon condition. There are many unknowns in the field of wind tunnel technique in civil engineering for the Reynolds similarity This paper describes the wind tunnel techniques for building design and the fullscale measurement of wind response of tall building.
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菊池 直志
1995 年 15 巻 Supplement1 号 p.
305-308
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
From'80, the low noise wind tunnel was required to develop a wind noise reducing equipment for power transmission. lines. Therefore, the low noise wind tunnel that had three types independent silencers was, constructed. This low noise wind tunnel was remodeled two times to make a low turbulence flow and high uniformity wind velocity distribution, to lower the wind noise. This paper reported some experience for reducing the wind tunnel noise.
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深谷 宏
1995 年 15 巻 Supplement1 号 p.
309-310
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
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粟倉 雄一, 青木 克己, 岡永 博夫
1995 年 15 巻 Supplement1 号 p.
311-314
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
In insulating liquid, fluid flow is produced by applying a high electric voltage between the pole electrode and plate electrode. This phenomenon are called Electro-Hydro-Dynamics
(EHD)phenomenon. This flow is changed when particle mixed to insulating liquid. In the present paper, flow characteristics are investigated experimentally. We use silicone oil and furon as insulating liquid. Velocity measurment by LDV and flow visualization by tracer method are carried out in this experiment. It becomes clarify that relations between velocity profile and applied voitage, gap length, electrode form, mass of particle, and kind of particle.
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野崎 勉, 李 輝, 園田 裕和
1995 年 15 巻 Supplement1 号 p.
315-318
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
This paper presents the results from an experimental investigation in the near field characteristics and the flow interaction of a doublet flow which consists of coaxial injection and suction flow. The mixing and diffusion of the inner injection flow can be manipulated by the outer suction flow. The higher the ratio of the suction velocity U
s at the pipe edge to the injection one U
i at the same location, the faster the decay of the center axis mean velocity in the doublet flow becomes. For a large value of U
s/U
i, the fluctuation velocity on the center axis abruptly increases and the doublet flow behaves an oscillating turbulent flow. From the results of flow visualization, it is clear that the width and the spreading angle of the doublet flow increase rapidly with increasing U
s/U
i and are larger than that of a free jet.
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二村 正, 野中 晃二, 原口 富博, 上野 道雄
1995 年 15 巻 Supplement1 号 p.
319-322
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
In this paper, we describe on the results of our investigation of a stern flow field around a ship in oblique towing motion. The purpose of this inveitigation is to get basic data available for developing, improving and verifying an estimation method of hydrodynamic forces acting on a ship in manoeuvring motion. Kinds of experiments which we carried out on three VLCC model ships are measurements of flow field by 5 hole Pitot tube, observation of flow field by tuft and measurements of hydrodynamic forces acting on a model ship. By these experiments, we investigated characteristics of flow field around a ship in oblique towing motion, and discussed relation between stern shape, flow field and hydrodynamic forces.
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橋本 親典, 辻 幸和, 杉山 隆文
1995 年 15 巻 Supplement1 号 p.
323-326
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
This research aims to increase the mixing efficiency of a bi-axial forced mixing type mixer so as to produce concrete without compromising the specific property intended for placing or after hardened. The arranged paddle angle and the installed blade angle of a developed model mixer were varied to investigate the flow pattern of simulating model concrete during mixed with the help of a visualization technique. The visualization technique allowed a macro-mixing efficiency to be evaluated by the movement of tracer particles which simulated coarce aggregate particles during mixed. The change in the distance between position of the tracers' gravity and the central position was measured with mixing time elapsed. The applicability of the finding in the mixing test using the model concrete to the mixing efficiency of actual mixer was proved by the mixing test using actaul concrete.
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小森谷 徹
1995 年 15 巻 Supplement1 号 p.
327-330
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
In order to calculate air flow around a passenger by using a numerical simulation of thermal flow, the heat boundary conditions of a human body have been investigated. In this study the passenger's skin temperatures, which are determined by solving the heat balance equation in the human body, have been taken for the heat boundary conditions. The correspondence between calculations and experiments by using a mock-up is qualitatively good. It may be concluded that this method is effective for the prediction of human skin temperatures in nonuniform thermal environments such as the vehicle compartment.
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藤沢 延行, 堀 陽一, 真柄 隆志
1995 年 15 巻 Supplement1 号 p.
331-334
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
The flow around a Darrieus wind tubine rotating at relatively low tip speed ratio is studied in a water tunnel by flow visualization with dye injection and the velocity field near the blade is measured by image processing with conditional sampling technique at some rotor angles. The flow visualization result indicates the production of some pairs of vortices in the flow field during a rotation of the blade, which is caused by the dynamic stall phenomenon. The measured velocity field around the blade reproduces the global features of the vortex formation in the flow visualization study and gives some quantitative informations on the flow field.
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板橋 明吉, 中瀬 敬之, 福富 純一郎, 妹尾 泰利
1995 年 15 巻 Supplement1 号 p.
335-338
発行日: 1995/07/01
公開日: 2009/07/31
ジャーナル
フリー
Connection between low flow rate characteristics and internal-flow condition in a centrifugal blower casing of commercial design was investigated by static pressure measurement and flow visualization using oil-film and depth-tuft methods. Inward flow oil-film pattern depicted on the top and bottom plates in scroll was basically unchanged over the whole flow rate. At the inlet region of exit duct, where sudden pressure rise occurred, reverse flow region was already observed on the top plate and the upper part of the side wall at flow rate φ/φ
d=0.61. This separation zone grew with decreasing flow rate. It was suggested that condition of flow from scroll toward the exit duct was closely connected to the low flow rate characteristics of blower.
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和田 存功, 山本 富士夫, 井口 学
1995 年 15 巻 Supplement1 号 p.
339-342
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
The present study deals with the torque converter (T/C) internal flow which is used for automatic transmission car. The T/C internal flows are visualized by the particle tracer technique. The technique, called the binary image cross-correlation method is applied to measure the flow velocity distributions. Since the velocity vectors are computed discretely at the particle positions in the PIV, some rearrangement methods are needed to get the velocity vectors at any point in order to extract the other physical informations. In this study, three new methods for velocity vector rearrangement using the equation of continuity, boundary element method (BEM in abbreviation), and the least square method are applied to the PIV results of T/C internal flow, and the performance of the new methods are examined.
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李 寅燮, 洪 起用
1995 年 15 巻 Supplement1 号 p.
343-346
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
The mechanism from suction pipe to suction muffler will be called "suction system" hereinafter. The compressor suction system has following complicated flow motion. It is theoretically known that the compressor efficiency decreases 2-3% as temperature of a suction refrigerant gas increses 10°C; it has slight deviation depending upon compressor capability. And measuring exact physical quantity from experiment and getting exact solution from theoretical approach in small hermetic compressor have its limits. As results of above reasons, there was no way to confirm the suction system because suction pipe and suction muffler inlet gap and its positions have been designed without theoretical solution and experimental data. So, the purpose of this research is suggest the optimized suction path from refrigerant visualization of reciprocating compressor suction system, and to see the refrigerant gas flow motion in the shell.
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加藤 裕之, 西野 耕一, 進士 晃, 鳥居 薫
1995 年 15 巻 Supplement1 号 p.
347-350
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
A direct-imaging technique for measuring size and velocity of solid/liquid particles dispersed in two-phase flows was developed. The depth-of-focus effect that has been imposing a serious limitation on the previous techniques was resolved here by use of stereo-imaging. Three-dimensional information provided by stereo-imaging has made it possible to obtain simultaneously the size, location and velocity of each particle. The measurement procedures were fully automated with an on-line system consisting of two CCD cameras, strobe lamps, a digital image processor. and others. Particle identification was done by using a newly devised algorithm, which was shown to be robust against the out-of-focus effect. The performance of this algorithm was verified by sizing still particles. As a comprehensive test of the present technique, transparent glass beads falling through a vertical pipe were measured.
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住野 和哉, 鈴木 敏夫
1995 年 15 巻 Supplement1 号 p.
351-354
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
It is generally known that there are many methods to measure wave height, but they are measured only at a point. So they demand a lot of labor for measuring in a plane.
Therefore in the past several years, our research is development of wave measurement method using image processing. In this paper we suggest the method using Photometric Stereo, and made sure their validity through experiments.
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植村 知正, 廣瀬 泰
1995 年 15 巻 Supplement1 号 p.
355-358
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
Some range sensing methods using a single camera have been proposed. Most of them utilize eccentric apertures. In these techniques, the higher the resolution of the picture, the more accurate range sensing can be achieved. In order to obtain the high spatial resolution, a HDTV camera is employed in the present system. And three eccentric apertures, which form a right-angle triangle, is placed in front of the camera lens. As the results of the calibrating experiment, the system has shown a fairly good measuring precision of about 0.2% of the picturing distance. Adding to the precision, it is found the eccentric aperture realizes the faster analysis by offering easier pattern recognition.
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西野 耕一, 山本 英, 川村 洋, 斉田 浩明, 新倉 治
1995 年 15 巻 Supplement1 号 p.
359-362
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
Three-dimensional particle tracking velocimetry (PTV) was applied to the measurement of fluid flows in a liquid bridge suspended between two disks in a microgravity environment achieved by the aircraft parabolic flight. This PTV is scheduled to be used in the sounding rocket (TR-IA#4) experiment, which is aiming at investigating the Marangoni convection and its turbulence transition in a liquid bridge. In the current study, a correction method for light refraction at the deformed gas-liquid interface was developed, and its performance was verified by making three-dimensional measurements of fixed points and tracer particles in the liquid bridge of silicone oil.
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加賀 昭和, 山口 克人, 井上 義雄, 近藤 明
1995 年 15 巻 Supplement1 号 p.
363-366
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
Since the life of tracer particles is very short in an airflow visualization using smoke or mist particles, it is difficult to fill the whole space with tracer particles. Therefore, tracer particles are supplied locally by predicting flow direction and the plane which is expected to include main flow is illuminated by a light sheet. Although velocity vectors are usually assumed to be two-dimensional in an airflow measurement through pattern tracking, the velocity componen tperpendicular to the visualized plane exists frequently in a real situation. In this paper we propose a new technique in which two planes perpendicular to camera axis are visualized simultaneously and the velocity component perpendicular to the planes is calculated from the differenc eof two images. The performance of the technique is investigated by a numerical experiment.
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気泡噴流からなる気液二相流への応用
纐纈 光幸, 山本 富士夫, 井口 学, 太田 淳一
1995 年 15 巻 Supplement1 号 p.
367-370
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
This paper proposes a new three consecutive time picture cross-correlation 3-D PTV (Particle Tracking Velocimetry), which is based on the combination of the binary image cross-correlation 2-D particle tracking between two projected screens, stereo pair matching and 3-D particle identification on three consecutive time pictures at regular time intervals. The present technique is applied to measure the flow structure of a weak bubbling-jet two-phase flow, and as a result, about one-hundred and fifty particle velocity vectors in the liquid motion and several higher velocity vectors of air bubbles are successfully measured.
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一岡 順, 望月 貞成, 八木 良尚
1995 年 15 巻 Supplement1 号 p.
371-374
発行日: 1995/07/01
公開日: 2009/07/31
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フリー
In a heat exchanger, the behavior of air flow influences the peformance of heat transfer greatly. Understanding the flow will help in improving the peformance and the cost reduction in the system of the heat exchanger. The purpose of this study is to grasp the flow structure and its influence on the peformance of the heat transfer. Flow visualization test was conducted using scale up models of heat exchanger cores which were produced geometrically similar to the actual heat exchangers. By comparing the flow visualization results with those obtained by heat transfer test, the way how the flow in a core affects the heat transfer performance was disclosed.
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