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29 巻, 201 号
選択された号の論文の19件中1～19を表示しています
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葛西 泰二郎, 高松 康生1963 年 29 巻 201 号 p. 853-859
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーAs the suction performance of a centrifugal pump is in close connection with the flow condition at the blade inlet, the absolute velocities and static pressures at the immediate front of the blade inlet of the test pump were measured by three-hole yaw probes on a wide range of discharge, prior to the tests on cavitation performance. After comparing these test results with those values in the case of potential flow obtained by the electrolytic liquid-bath method, growing process of the reverse flow from impeller passages to the suction pipe which occurs on partial flow-rate, its effects on the flow condition at the blade inlet, and the effects of change of the blade loading on the flow direction at the blade inlet are clarified. And the effects on the inlet flow condition caused by the separation zone on the shrouding surface are discussed.抄録全体を表示PDF形式でダウンロード (936K) -
葛西 泰二郎, 高松 康生1963 年 29 巻 201 号 p. 860-868
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーCavitation aspects in the centrifugal pump impeller have been investigated considerably so far, and yet there is lacking in the detailed observation on the growing processes of the cavitation ensuing its inception. Then, the aspects of the inception of cavitation and its growth in a centrifugal pump impeller were observed by a stroboscope and photographed by means of micro-flashes, over the extensive ranges of speed, discharge and suction static pressure of the pump. In this paper, we clarified the growing processes of cavitation zones and their three dimensional shapes under various operating conditions, then explained the causes of their behavior by the flow conditions in the impeller passage. Besides, the occurrence of distinctive phenomena such as the sudden change of direction of the characteristic curve of the pump and the cavitation on the convex surface of the blade at small flow-rate were reported.抄録全体を表示PDF形式でダウンロード (2269K) -
堀江 親延, 大島 政夫1963 年 29 巻 201 号 p. 868-877
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーSeveral mixed-flow pump impellers were tested in a test pump for the purpose of studying the effects of the number of vanes and the inlet edge shapes on their performance and cavitation characteristics. The impact-free-entry flow rates were obtained from the incipient cavitation conditions and inlet flow deviation angles were found, their degree varying with the number of vanes. There was very little effect of the inlet edge shapes on the normal performance, but they proved to be considerably influential on the cavitation characteristics. For the blunt inlet edge cavitation was observed on both sides of the edge simultaneously, while for the sharp inlet edge it occurred on one side. The values of cavitation parameter kd for the impellers with the blunt inlet edge were about twice as large as those for the ones with the sharp inlet edge when compared at the beginning of the total head drop.抄録全体を表示PDF形式でダウンロード (1469K) -
大橋 秀雄1963 年 29 巻 201 号 p. 878-889
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーTwo adjacent rows of blades, which constitute a tandem compressor cascade, interfere aerodynamically with each other, so that the deflection angle and losses are different from those of a system having no interference. In order to calculate the interference effect on cascade performance, a method must be found for calculating the change of flow field due to interference. This paper presents a theoretical method for determining the two-dimensional incompressible potential flow through an arbitrary tandem compressor cascade based on a singularity method. This theory is especially suitable for the case in which the relative position between the two blade rows varies, while the blade profiles and settings remain constant. Results of sample calculation are shown and compared with the corresponding experimental results.抄録全体を表示PDF形式でダウンロード (1074K) -
山口 誉起1963 年 29 巻 201 号 p. 890-894
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーThis paper deals with an analytical study of the inlet-flow field for a two-dimensional cascade, where the axial flow is subsonic and the relative flow is supersonic. The flow model accounts for the case where the suction surface of a blade is a convexed line in the entrance region. Using the ana1ysis, the complete inlet-flow field can be constructed, the losses due to shock waves being estimated. Two numerical examples for the different circular entrance regions are given in the case where either Mach number is 1.6 at the end in the entrance region. The results in either case indicate that the pressure amplitude decreases below about 4% of the dynamic pressure at infinite distance upstream and the losses due to shock waves are neglegibly small.抄録全体を表示PDF形式でダウンロード (570K) -
山口 誉起1963 年 29 巻 201 号 p. 895-902
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーBlade passages affect much on the performance of the supersonic axial-flow compressor blading of internal shock type. To investigate their effects and obtain basic data for the design of a supersonic compressor having a good efficiency, a single channel investigation for five different passages was carried out at the entrance Mach number of 1.55, using Freon 113. Real channel flows were radically different from those with ideal fluid because of the shock-boundary layer interaction, that is, having poor pressure rises through shocks and different starting conditions from theoretical ones. Results at the maximum back pressure are that the Mach numbers ahead of the normal shocks in the divergent portions of the passages and losses in the free streams coincide approximately with those obtained from one-dimentional analysis for an ideal flow, but the locations of the normal shocks and pressure rises through them depend upon the divergent angles and widths of the passages. And separation was observed for the passage with its divergent angle of 10°.抄録全体を表示PDF形式でダウンロード (1188K) -
相原 利雄1963 年 29 巻 201 号 p. 903-909
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーThe heat dissipation from two parallel plates vertically held in free air is experimentally studied. From the Schlieren photos taken under various conditions of S (spacing of two plates) and ΔT (temperature difference between the heated surface and environment), the temperature gradients over the surface are evaluated and the local heat transfer coefficients : αx are calculated. An experimental formula representing the mean Nusselt number is obtained.[numerical formula] for [numerical formula] where [numerical formula] H : height of plate. The physical properties at the wall temperature are considered. A comparison is made between the result of this work and the experimental works of Kennard and Elenbaas.抄録全体を表示PDF形式でダウンロード (962K) -
安本 武之助, 根岸 完二, 西岡 清1963 年 29 巻 201 号 p. 910-914
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーFor the design of ramjet combustor, the characters of flameholders are very important. By L.W Huellmantel's experiment, it is sure that recessed wall flameholders have smaller pressure drop and wider range of flame stabilization than bluff body flameholders. The authors investigated this before applying the recessed wall flameholder to the ramjet combustor. Namely, they were able to know that the flame-holding mechanism by the grooves was alike that by the bluff body flameholders, and experimented on the relation between the width of grooves and their flame stability limits. The result is that l/h=5 is the best condition, where l is the width and h is the depth of the groove.抄録全体を表示PDF形式でダウンロード (1173K) -
河村 長司1963 年 29 巻 201 号 p. 915-923
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーConcerning a diffusion flame stabilized by the rim type flameholder in the two dimensional duct in which air flows, the effects on a few blockage ratios (" BR"s) for the flame configuration, the brief ratio of air flowing into the reaction zone through the flame boundary, and the blow-off velocity were studied experimentally. The main conclusions obtained are as follows : (1) It is clear that the flow pattern near- by the flameholder is considerably similar to that of the premixture flame stabilized by a bluff body when the velocity of the fuel jet is smaller than that of the free stream as in the present experiment. (2) A part of fuel flows into recirculation zone (RZ) immediately. But the greater part of fuel flows from the nozzle to both sides of the flameholder and mixes with a part of the free air stream at the shear layer. RZ plays an important role for flame stabilization. (3) The brief ratio of air flowing into the reaction zone through the flame boundary for the total air flow entering into the duct is about 20 % at BR=0.5 and is 0 % at BR→0. The percentage variation between the above " BR"s is linear.抄録全体を表示PDF形式でダウンロード (1584K) -
赤川 浩爾1963 年 29 巻 201 号 p. 924-931
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーThe most remarkable characteristic in two-phase flow is the pulsating phenomenon of flow that liquid piston and gas piston flow alternately. In this study, the pulsation has been measured as the fluctuation of void ratio with an electrode probe which indicates the existence of liquid or gas-phase at the tip of probe. The experiment has been carried out for air-water two-phase upward flow in 27.6mm ID glass tube. The periods of the fluctuation of void ratio have normal distribution and the mean values are expressed with a experimental formula.[numerical formula] Where, wd0 : superficial velocity of air (m/s), ww0 : superficial velocity of water (m/s). The standard deviations are about 30 % of the mean values. The radial distribution of " the gas-phase existence time ratio" in the tube has been measured by shifting the probe.抄録全体を表示PDF形式でダウンロード (965K) -
一色 尚次1963 年 29 巻 201 号 p. 932-943
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーConsidering rachet mechanism of the combined steady mechanical stress and intermittent thermal stress on a thin tube wall of ductile material, Miller pointed out that, there exists a limit for the strength of thermal stress, above which the tube material shows one directional plastic flow at every start and stop of heating. In this report, the above Miller's theory is extended to the case where creep takes place in tube material, and some consideration on thermal fatigue effect is added to the theory, and upper limits for permissible combination of thermal and mechanical stresses on thin and thick wall tubes are analysed for many cases. By the analysis, the maximum heat flux design and minimum tube wall weight design of heat flux and wall thickness, with given inside diameter and pressure of a tube and given yield strength of its material, are approximately predicted theoretically, within the stress ranges, where plastic flow or plastic hysteresis cycle does not occur even if creep takes place. Some calculated examples show that the heat-flux of this kind will be very important for super high pressure boiler tube in the near future.抄録全体を表示PDF形式でダウンロード (1248K) -
葉山 真治1963 年 29 巻 201 号 p. 944-950
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーAn investigation is carried out on the hydrodynamic instability in a system having two boiling channels. The basic equations for the circulation flow rates and driving heads are introduced from the laws of conservation of mass, energy and momentum. The stability of equilibrium in the hydrodynamic system and the modes of vibration are discussed. As the results, the following facts are found. (a) The system is always stable when the equilbrium of the hydrodynamic system lies in the range of positive inclination of the characteristic curve for each channel and (b) always unstable when the equilibrium in the range of negative inclination of the characteristic curve for each channel ; (c) When the equilibrium lies in the range of positive inclination for one channel and in that of negative inclination for the other channel, the system is either stable or unstable ; (d) There are two normal modes of vibration in the system with two boiling channels. The first is a mode in which each channel vibrates in the same phase and the second is a mode in which each channel vibrates in the opposite phase ; (e) In the case of (b) the second mode is always unstable and a throttle or a pump in the downcomer is not effective to cause positive damping to the second mode and (f) In the system with parallel channels there can be many equilibriums, so that non-uniform distributions of flow rates may occur.抄録全体を表示PDF形式でダウンロード (700K) -
菅原 菅雄, 佐藤 俊, 南山 竜緒, 富田 仁治1963 年 29 巻 201 号 p. 951-957
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーAs discussed by SUGAWARA and SATO, the equation of the state of steam in the virial expansion form is favorable in high temperature range, because it may be accurately approximated by small terms. And in order to determine the second and the third virial coefficients of steam experimentally, the accurate experimental results in the region of comparatively low density are considered to be necessary. By using an apparatus for this purpose, the experimental results of the relation between pressure, temperature and specific volume of steam up to 650°C were obtained. Moreover, in order to obtain the more accurate experimental data in the higher temperature range, some considerations on the experimental apparatus and procedure were done, and the results in the temperature range up to 850°C will be shown in the subsequent report.抄録全体を表示PDF形式でダウンロード (906K) -
菅原 菅雄, 佐藤 俊, 南山 竜緒1963 年 29 巻 201 号 p. 958-968
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーBy using the new improved apparatus and procedure mentioned in the previous report, the experiments on the relation between pressure, temperature and specific volume of steam in high temperature range up to 850°C and comparatively low pressure range up to 150kg/cm2 were carried out. The experimental results are presented and discussed here. And the second and third virial coefficients of steam were determined on the basis of our results and compared with the results by the several investigators. The equation of the state of steam in the high temperature range is pressented as follows in terms of these second and third virial coefficients. [numerical formula] where, P is pressure kg/m2, V is specific volume m3/kg, T=273.15+t is absolute temperature °K, t is temperature °C, R is the gas constant of steam 47.06 kg m/kg °K, B is the second virial coefficient m3/kg and C is the third virial coefficient (m3/kg )2. Moreover, the equations of the several thermodynamical properties of steam are proposed, basing on this equation of state, and the relations between these thermodynamical properties and pressure and temperature numerically calculated, are shown.抄録全体を表示PDF形式でダウンロード (1125K) -
小竹 進, 岡崎 卓郎1963 年 29 巻 201 号 p. 969-978
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーIt is the purpose of the present investigation to theoretically indicate the relation between the far-noise-field of subsonic-free-air-jet and the flow-field and make clear the characteristics of the acoustic field of jets on the basis of experiment. The noise intensity depends upon the turbulent velocity correlations and its derivative correlations. The noise emitted in the jet-axis direction is mainly contributed to fluctuations parallel to the axis with lower frequency and that radiated in the direction perpendicular to the axis is determined by those perpendicular, with higher frequency. The eddy convection effect is to make spectra move towards the lower frequency side, which is proportional to ω-4 in higher frequency and to ω2 in lower. The acoustic intensity of higher frequency increases proportionally to y1-3 in the mixing region and to y1-10 in the turbulent region and of lower, to y1+3 and to y1-4 respectively, that is, the higher frequency noise is generated mainly near the nozzle exit and the lower, in the transition region.抄録全体を表示PDF形式でダウンロード (994K) -
佐藤 豪1963 年 29 巻 201 号 p. 979-987
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーDas Zweikreis-Turbolader-Strahltriebwerk eignet sich besonders in Fluggeschwindigkeits-bereichen, die fur den Propeller zu hoch, fur das reine Strahltriebwerk zu niedrig sind. In dieser Abhandlung wird die Bedingungen der optimalen Wirkungsgrade dieser Strahltrieb-werke durch Lagrangesche Methode vom thermodynamischen Standpunkt durchberechnet. Von dieser Berechnung kann man die Charakteristik von ZTL kennenlernen, damit wird es mog1ich bei Gestaltung fur eine bestimmte Fluggeschwindigkeit und ein bestimmtes Hochsttem-peraturverhaltnis das Umfuhrungsverha1tnis und die entsprechenden Temperaturverhaltnisse jeder Komponente notwendigerweise richtig wahlen zu konnen.抄録全体を表示PDF形式でダウンロード (833K) -
南 正巳, 向原 誠也, 高木 三郎1963 年 29 巻 201 号 p. 988-994
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーUsing the temperatures of piston, ring and liner measured by means of thermocouples, some heat resistances between the ring-land and the ring Rp, the ring itself Rr, and between the ring and the cylinder-liner Rl were calculated and examined separately. As a result, the following facts were found. (1) Rp in the running condition is nearly equal to that value, which has been reported, as the contact resistance, when the metals are brought into static contact with each other. (2) Rp is hardly affected by the kind of piston metals and also the engine load. (3) Rl depends mainly upon the thickness of oil film formed on the ring surface. As the ring temperature rises with the increase of engine load, the film becomes thin and then Rl decreases. (4) Since the values of Rr and Rl are very smaller than that of Rp, the total heat resistance in such a heat transmisson process seems to be almost governed by Rp only.抄録全体を表示PDF形式でダウンロード (865K) -
長尾 不二夫, 太田 脩二, 井上 悳太, 高倉 稔1963 年 29 巻 201 号 p. 995-1000
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーThe temperature rise of the inlet-air due to throttling is very useful for starting aid in Diesel engines as described in the previous papers. To the two-cycle Diesel engine with a scavenging pump, the same method has been applied, throttling the inlet side of the pump. The theoretical calculation and the measurement of the scavenge air temperature was carried out for the various thrott1e ratios, which contain thrott1e area, stroke volume, and rotating speed. Results obtained are summarized as follows : (1) The scavenge air temperature rises as the throttle ratio decreases. For the same throttle ratio, the temperature rise becomes large with increasing rotating speed of the pump. (2) In a practical engine, the minimum starting temperature of cooling water was lowered by about 30°C by appling this method, for a certain throttle ratio.抄録全体を表示PDF形式でダウンロード (787K) -
山内 高調1963 年 29 巻 201 号 p. 1001-1004
発行日: 1963/05/25
公開日: 2008/03/28
ジャーナル フリーPDF形式でダウンロード (500K)
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