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Fumio YOSHINO, Tatsuo HAYASHI
1984 Volume 50 Issue 449 Pages
3-10
Published: January 28, 1984
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Koichi NAKABAYASHI
1984 Volume 50 Issue 449 Pages
11-18
Published: January 28, 1984
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Nobuhiko YAMASAKI, Masanobu NAMBA
1984 Volume 50 Issue 449 Pages
19-27
Published: January 28, 1984
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Hisataka TAMURA, Masaru KIYA, Mikio ARIE
1984 Volume 50 Issue 449 Pages
28-35
Published: January 28, 1984
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Manabu IGUCHI, Munekazu OHMI
1984 Volume 50 Issue 449 Pages
36-44
Published: January 28, 1984
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Masataka SHIRAKASHI
1984 Volume 50 Issue 449 Pages
45-50
Published: January 28, 1984
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Takaaki SHIZAWA, Hiromitsu SHIRAI, Shinji HONAMI
1984 Volume 50 Issue 449 Pages
51-58
Published: January 28, 1984
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Kazuo MURAOKA
1984 Volume 50 Issue 449 Pages
59-67
Published: January 28, 1984
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Hiroshi YAMASHITA, Genichiro KUSHIDA, Ryotaro IZUMI
1984 Volume 50 Issue 449 Pages
68-78
Published: January 28, 1984
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Kensuke KAWASHIMO, Kichiro MORIKAWA
1984 Volume 50 Issue 449 Pages
79-84
Published: January 28, 1984
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Kichiro MORIKAWA, Kensuke KAWASHIMO
1984 Volume 50 Issue 449 Pages
85-90
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Shinobu TOKUDA, Toshio OSANAI
1984 Volume 50 Issue 449 Pages
91-97
Published: January 28, 1984
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Masataka ARAI, Tsugio KISHI, Hiroyuki HIROYASU
1984 Volume 50 Issue 449 Pages
98-106
Published: January 28, 1984
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Tetsu FUJII, Kousuke ODA
1984 Volume 50 Issue 449 Pages
107-113
Published: January 28, 1984
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Hideo YOSHIKAWA, Masaharu KORI
1984 Volume 50 Issue 449 Pages
114-121
Published: January 28, 1984
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Katsuyuki OHSAWA, Katsuhiko SUGIYAMA, Kenji FUJIKAKE
1984 Volume 50 Issue 449 Pages
122-131
Published: January 28, 1984
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Norimasa IIDA, Kensuke KONO, Osamu KAWAGUCHI, G. Takeshi SATO
1984 Volume 50 Issue 449 Pages
132-141
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Kenichi ITO, Masafumi SASAKI
1984 Volume 50 Issue 449 Pages
142-150
Published: January 28, 1984
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Toshio ISHII, Ken KISHIMOTO, Katsuya NAGATA
1984 Volume 50 Issue 449 Pages
151-158
Published: January 28, 1984
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Teruhiko UEMUKAI, Tomohiro NOMURA, Ichiro HIGASHINO
1984 Volume 50 Issue 449 Pages
159-167
Published: January 28, 1984
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Tsutomu HOSOKAWA, Tsutomu KAWAI, Genichi KOMATSU
1984 Volume 50 Issue 449 Pages
168-172
Published: January 28, 1984
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Ikuo TOKURA, Hakaru SAITO, Koki KISHINAMI
1984 Volume 50 Issue 449 Pages
173-178
Published: January 28, 1984
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Hiroshi KATAKURA, Shigeru TSUJI, Ryuichiro YAMANE, Hirotaka FUJITA
1984 Volume 50 Issue 449 Pages
179-184
Published: January 28, 1984
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In this report, results obtained from researches on air solubilities of petroleum-base oils and on changes in diameters of stationary bubbles in the oils are presented. Some of the results are as follows. The air solubilities are calculated by the theory on regular solutions and measured for 5 petroleum-base oils. And we obtained that measured values of the air solubilities fit in the calculated values by assuming that solubility parameters of the oils are 1.4×10
4√(J/m
3) for paraffin-base oils and 1.6×10
4√(J/m
3) for naphthene-base oils, as the results. From the observations of the changes in diameters of single stationary bubbles in the oils, we obtained that the diffusivities of the dissolved air in the 5 petroleum-base oils are in 1×10
-10m
2/s at temperature T≅300 K.
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Hiromu SUGIYAMA
1984 Volume 50 Issue 449 Pages
185-192
Published: January 28, 1984
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A numerical method (inverse method) was developed for gas-particle supersonic flow past axisymmetric blunt bodies. This method is based on a stream function coordinate system, which makes it convenient for determining the shock layer flowfields and body shapes. In using the present method, the gas-solid particle flows in the shock layers around blunt bodies (nearly spheres) were solved for freestream Mach number M
∞=2. The effects of freestream loading ratio and particle diameter on the shock layer thickness, the body surface pressure and the flow quantities along the stagnation streamline are shown, and the flow patterns (gas streamlines and particle streamlines) in the shock layers are also shown.
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Masatkata HASHIMOTO
1984 Volume 50 Issue 449 Pages
193-201
Published: January 28, 1984
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Unsteady aerodynamic damping force and its chordwise distribution over a cascade blade in a bending motion were experimentally studied for the wide range of non-dimensional frequency k and inter-blade phase angle σ by use of a wind-tunnel and by the forced oscillation method. For the range of k≤1, the experimentally obtained aerodynamic damping forces agreed well with the one predicted by the subsonic unsteady potential flow cascade theory. But, in the range of 1<k≤4.2, the experimental values were less than the theoretical ones, and even negative, especially for σ <0. The reason of this discrepancy is considered to be attributed to the superposing effect of the downwash contributions from adjacent blades and the so-called boundary-layer time lag.
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Yutaka TSUJI, Yoshinobu MORIKAWA, Yoshitaka FUJIWARA
1984 Volume 50 Issue 449 Pages
202-209
Published: January 28, 1984
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A group of solid spheres were hung by thin rods in a pipe to make a model of two-phase flow of solid particles. Pressure drops and velocity distributions were measured for different types of the model. Drag coefficients of spheres, which were calculated from experimental values of pressure drops, were larger than that of a single sphere in an unifrorm stream. Properties of mean and turbulent velocities in the model showed the same tendency as observed in the two-phase flow of coarse particles.
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Tamotsu IGARASHI
1984 Volume 50 Issue 449 Pages
210-218
Published: January 28, 1984
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Experimental investigations on the characteristics of the flow around square prisms at angles of attack (0°≤α≤45°) were carried out in the range of subcritical Reynolds numbers. For α<15°, the perfect separated regime may be further subdivided into the symmetric and unsymmetric flows at α=5°. For 15°<α≤35°, the lower separated shear layer reattaches and a separation bubble exists on lower surface. For 35°<α≤45°, the flow field resembles that about a wedge. It becomes clear that the rms values of the pressure fluctuations is closely related to another characteristics of the flow corresponding to those flow patterns.
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Ikuo NAKAMURA, Shintaro YAMASHITA, Takashi WATANABE
1984 Volume 50 Issue 449 Pages
219-225
Published: January 28, 1984
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For a prescribed external pressure gradient, the laminar boundary layer equations which govern the flow developing on a rotating thin circular cylinder in an axial flow are solved numerically. It is shown that both self-induced favorable pressure gradient caused by rotation and adverse pressure gradient largely influence the flow fields. Although the two-dimensional boundary layer equations usually have a singularity at the separation point, in this paper the numerical solutions are obtained to integrate the equations without using special techniques through the separation point and into the region of reverse flow. Alternatively the numerical instability and the abrupt change of the slope of stream lines appear downstream beyond separation point and computation is terminated. It is suggested that the singular properties occur not on the wall but within the boundary layer.
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Kenjiro KAMIJO, Kunio HIRATA
1984 Volume 50 Issue 449 Pages
226-232
Published: January 28, 1984
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Several small cryogenic pumps for a liquid rocket engine have been made and tested. These pumps have a small impeller and are characterized by high speed and high head. The main design characteristics of these pumps are as follows: stage specific speeds of 80∼200 (m, m
3/min., rpm), flow rates of 16∼52.5 L/s, pressure rised of 4.9∼26.0 Mpa, rotating speeds of 16, 500∼80, 000 rpm and impeller diameters of 83∼146 mm. The present test pumps showed higher efficiency even in the range of small stage specific speeds than previously reported. Furthermore, the two-stage pumps showed considerably higher efficiency than the single-stage pumps with the same stage specific speed. Remarkable improvement of suction performance owing to thermodynamic effects of cavitation was also confirmed regarding the present small high speed pumps. With regard to pump efficiency measurement, the adiabatic efficiency relative to cryogenic pump fluids was investigated and a considerably good agreement between it and the actual pump efficiency was recognized.
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Tetsuo FUJIMOTO, Masaru USAMI, Akira MATSUBARA
1984 Volume 50 Issue 449 Pages
233-240
Published: January 28, 1984
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Structures of the free jets from small nozzles are studied by flow visualization. Tests are carried out with He, air, Ar, CF
4, CCl
2F
2 and CCl
4 seeded with I
2 which radiates fluorescence by illumination of the Ar-ion laser beam. Entire flow field of the jets is visualized by scanning of the laser beam along the jet axis. Positions of the Mach-disc, barrel shock and jet boundaries are determined from the photographs. Local velocity and density distributions are measured by the micro-densitometric study of the quenching of the fluorescence.
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Masami SUZUKI, Chuichi ARAKAWA, Tetsuo TAGORI
1984 Volume 50 Issue 449 Pages
241-248
Published: January 28, 1984
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In order to find out the influence of solidity on wells turbine, the experiments were carried out in series with fan-shaped wings which have the constant solidity from hub to tip. The following facts are found that the best efficient solidity is about 0.6, and that as the solidity increases, the operation range of negative torque becomes smaller, though all turbines cannot start by themselves in a uniform flow. Owing to calculations which include the effects of sine wave input and the inertia of turbine, some turbines are shown to be self-started. Furthermore, with the appropriate flow rate control, other turbines can also rotate in high-speed condition theoretically.
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Shin-ichi MIYAE
1984 Volume 50 Issue 449 Pages
249-256
Published: January 28, 1984
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This paper presents the analysis of the shaft horsepower and the efficiency of the sand pump which handles the solid-liquid mixture. The value of the shaft horsepower is obtained from the experiments on the model pump and it is analyzed based on the estimated value of the theoretical head which is reported in the former paper of the author. As the results, in case of small particles mixture, every power loss (without mechanical power loss) will almost increase in proportion as the density of the mixture increases. Furthermore, the tendency of recirculation loss, which is unknown untill now, is made known and it is cirtified that the reductive rate of efficiency is generally smaller than that of hydraulic head.
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Masanori KANO, Toshio KOBAYASHI, Tomo-o ISHIHARA
1984 Volume 50 Issue 449 Pages
257-264
Published: January 28, 1984
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Fully developed incompressible turbulent flow in two-dimensional channel has been simulated numerically. Turbulence promoters were arranged periodically on one side of channel walls. Two walls and promoters were heated individually. The large-scale flow field and temperature field have been calculated by integrating the filtered, three-dimensional time-dependent Navier-Stokes equations and time-dependent energy equation. Motions of the turbulence field with small scales were simulated through eddy-viscosity models. The Reynolds and Peclet numbers were set at 1.1×10
4 and 7.7×10
3, respectively. Only 9, 000 grid points were distributed and three kinds of averaging were used in order to complement the grid points. Mean-velocity profiles, turbulence statistics, time-dependent features of flow and mean-temperature profiles were obtained. The wall temperature profiles are in good agreement with the experimental data. Calculations were carried out on the HITAC M 200/280 H system computer of University of Tokyo.
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Ryozo ISHIWATA, Hideo OHASHI
1984 Volume 50 Issue 449 Pages
265-272
Published: January 28, 1984
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Fluid forces on bluff bodies in oscillating flow are one of the fundamental subjects of fluid engineering and have been investigated in connection with wave-induced forces on ocean structures and others. The present work deals with the forces on a circular cylinder in sinusoidally oscillating flow. The fluid forces were measured and were numerically analyzed by means of FEM. The amplitudes of oscillations are set from 0.18 to 1.3 times cylinder diameters and Reynolds numbers vary from 370 to 8860 in this work. The results showed that the measured drag forces are satisfactorily described by the so-called Morison equation. The numerical analysis by FEM proved to be very useful for the predictions of fluid forces in this range of amplitudes.
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Hideo OHASHI, Yasumasa ICHIKAWA, Hisao ENOMOTO
1984 Volume 50 Issue 449 Pages
273-278
Published: January 28, 1984
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As a ventilation system of automobile tunnels, semi-transverse ventilation with exhaust duct has such an advantage that no vitiated air is blown out of both portals, provided a suction neutral point is formed inside the tunnel. For the calculation of pollutants concentration of this system, the effect of axial diffusion caused by the turbulence of passing vehicles is introduced based on the study of the 1st report. The location of peak concentration, the level of peak concentration and the extension of highconcentration range are given in figures as the function of neutral point location and newly defined diffusion parameter.
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Kazuhiro TANAKA, Hideo OHASHI
1984 Volume 50 Issue 449 Pages
279-285
Published: January 28, 1984
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Performance tests of single-stage, single-suction, centrifugal pumps with relatively low specific speed, were done over a wide range of Reynolds number, 10
3 to 10
6. The test was carried out using seven different impellers combined with two volutes. Five impellers were of radial-vane type in order to reduce disk friction loss and to increase work input. Othor two impellers were open type with six logarithmic-spiral vanes. The results showed that pump performance deteriorate completely independent of pump structure when Reynolds number decreases to 10
3. However, the improvement of pump efficiency can be materialized by choosing proper configuration parameters at middle Reynolds number around 10
4.
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Mitsunobu AKIYAMA, Yoshiaki HANAOKA, K.C. CHENG, Isamu URAI, Michiyosh ...
1984 Volume 50 Issue 449 Pages
286-292
Published: January 28, 1984
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Three-dimensional laminar-flow development in a curved pipe has been investigated by using flow visualization technics. The hydrogen bubble and the powder of pumice used in Japanese painting were applied to trace the main and secondary flows, respectively. During the distortion of the main flow towards the outer wall due to the centrifugal force in the midst of the development, an overshooting phenomenon which gives a cone-shaped low velocity zone in the cross sectional center is clearly identified. There is also an indication of an additional pair of Dean's type secondary motion assorted with the ordinary vortex pair of the boundary wall type. The flow structures depicted in the experiments are in good agreement with the theoretical solutions.
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