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Tetsuo NISHIYAMA, Shinji YOSHIOKA, Makoto AKAMA
1983 Volume 49 Issue 448 Pages
2655-2661
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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Masaru ISHIZUKA, Masaaki SHIRAKURA, Hisao ENOMOTO
1983 Volume 49 Issue 448 Pages
2662-2669
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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Yasutoshi SENOO, Nobumasa KAWAGUCHI
1983 Volume 49 Issue 448 Pages
2670-2676
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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Takahiko TANAHASHI, Akira CHINO, Shinji KAWAMOTO, Tatsuo SAWADA, Tsune ...
1983 Volume 49 Issue 448 Pages
2677-2684
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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Tadayoshi SUGIMURA, Toshitaka FUJIWARA
1983 Volume 49 Issue 448 Pages
2685-2694
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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Masakazu KONDO
1983 Volume 49 Issue 448 Pages
2695-2703
Published: December 25, 1983
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Tohru FUKANO, Hiroshi AKENAGA, Masayoshi IKEDA, ITOH Akihiko, Tessho ...
1983 Volume 49 Issue 448 Pages
2704-2714
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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Mamoru OZAWA, Koji AKAGAWA, Tadashi SAKAGUCHI, Shigeo TAKAGI
1983 Volume 49 Issue 448 Pages
2715-2724
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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Hideo FUJIE
1983 Volume 49 Issue 448 Pages
2725-2734
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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Junichi KUROKAWA, Yasutane AMASAKA
1983 Volume 49 Issue 448 Pages
2735-2745
Published: December 25, 1983
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Yukimaru SHIMIZU, Sadao KUZAHARA, Syogo NAKAMURA
1983 Volume 49 Issue 448 Pages
2746-2754
Published: December 25, 1983
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Yukimaru SHIMIZU, Sadao KUZAHARA, Syogo NAKAMURA
1983 Volume 49 Issue 448 Pages
2755-2764
Published: December 25, 1983
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Koji KIKUYAMA, Mitsukiyo MURAKAMI, Shinichi ODA
1983 Volume 49 Issue 448 Pages
2765-2774
Published: December 25, 1983
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Osami KITO, Tohru KATO
1983 Volume 49 Issue 448 Pages
2775-2782
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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Yutaka TANAKA
1983 Volume 49 Issue 448 Pages
2783-2793
Published: December 25, 1983
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Toshio KURABAYASI, Takao KARASAWA
1983 Volume 49 Issue 448 Pages
2794-2802
Published: December 25, 1983
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Yoshinori TAKAISHI, Noboru KAGAWA, Masahiko UEMATSU, Koichi WATANABE
1983 Volume 49 Issue 448 Pages
2803-2810
Published: December 25, 1983
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Noboru KAGAWA, Yoshinori TAKAISHI, Msahiko UEMATSU, Koichi WATANABE
1983 Volume 49 Issue 448 Pages
2811-2820
Published: December 25, 1983
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Nobuhiro SEKI, Shoichiro FUKUSAKO, Uh USAMI, Toshiya HIRAGA
1983 Volume 49 Issue 448 Pages
2821-2829
Published: December 25, 1983
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Shinsuke AKAGI, Katsumi YOSHITANI
1983 Volume 49 Issue 448 Pages
2830-2837
Published: December 25, 1983
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Hideo INABA, Kimio KANAYAMA
1983 Volume 49 Issue 448 Pages
2838-2846
Published: December 25, 1983
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Sotoshi KUMAGAI, Jiro OGATA, Ryohachi SHIMADA, Masaki OUCHI, Toshiro T ...
1983 Volume 49 Issue 448 Pages
2847-2855
Published: December 25, 1983
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Sotoshi KUMAGAI, Jiro OGATA, Ryohachi SHIMADA, Masaki OUCHI, Toshiro T ...
1983 Volume 49 Issue 448 Pages
2856-2863
Published: December 25, 1983
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Takeshi KUNITOMO, Kenji MARUMOTO, Michitoshi MORIMOTO
1983 Volume 49 Issue 448 Pages
2864-2872
Published: December 25, 1983
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Shinzo KIKKAWA, Minoru NONOGAKI
1983 Volume 49 Issue 448 Pages
2873-2878
Published: December 25, 1983
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Hideaki TANABE, Tomohide SORIHASHI, Naomi SUZUKI, Hajime FUJIMOTO, G. ...
1983 Volume 49 Issue 448 Pages
2879-2885
Published: December 25, 1983
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Masanori SHIMIZU, Masataka ARAI, Hiroyuki HIROYASU
1983 Volume 49 Issue 448 Pages
2886-2892
Published: December 25, 1983
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Naokazu KUBOTA, Akihiro ISOGAMI
1983 Volume 49 Issue 448 Pages
2893-2900
Published: December 25, 1983
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Although studies on pump cavitation performance have been made by many researchers, it seems difficult to get suction specific speed of more than S = 2 000 (m, m
3/min, rpm) without lowering pump efficiency. In this paper, a new type centrifugal impeller with tandem blade rows is suggested. This impeller consists of a front blade row and a main blade row : the former has three vanes and operates as an inducer, and the latter has six vanes and takes part of pump operation. Tested pump is of centrifugal type with Ns=215. Its pump and cavitation charateristics were investigated at various relative positions of the two blade rows in peripheral direction and pressure distributions in the impeller were measured. Moreover, flow in the impeller was analyzed theoretically by using singularity method. As the result, it was found that its cavitation performance was considerablly improved without lowering pump efficiency and S=2900 was obtained.
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Eiji HASEGAWA, Toshiyuki UMEHARA, Motohiro ATSUMI
1983 Volume 49 Issue 448 Pages
2901-2907
Published: December 25, 1983
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Waves on a free surface of a viscous liquid layer in horizontally infinite extent under a vertically imposed oscillation are investigated theoretically by a linear theory. They are governed by a kind of the ordinary differential equation with periodic coefficients. In the case of the subharmonic responce, the stability boundary, which separates the unstable region from the stable one, are obtained numerically for a given wave number of the disturbance. The curves, which envelops these stability boundaries for the various wave numbers, i. e. the neutral stability curves, are obtained in the frequency-amplitude space. It is found from these neutral stability curves that there is a minimum value in the critical amplitude, above which the disturbance first occurs. While, the neutral stability curves are obtained experimentally by using Glycerine as a viscous liquid. The experimental critical amplitudes are shown to be in good agreement with the theoretical ones.
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Eiji HASEGAWA, Hisao IZUCHI
1983 Volume 49 Issue 448 Pages
2908-2914
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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The two dimensional Couette-Poiseuille flow under a constant pressure gradient in the channel bounded by a wavy wall at rest and a plane wall with a constant velocity is studied theoretically without imposing restrictions on the profile of the wavy wall, except that the width of the channel is small in comparison with the wave length of the wavy wall. A solution containing the inertia is obtained by a method of successive approximations. It is applied to the channel flow bounded by a simple-harmonic wavy wall and a plane wall. It is found that the presence of the inertia can play an important role in the effect of the profile of the wavy wall on the flow. The critical condition under which the discharge or the viscous force acting on the wall is equal to zero is determined with the moving velocity of the plane wall. The minimal value of the discharge and the viscous force acting on the wall are obtained as a function of the amplitude of the simple-harmonic wavy wall. Finally, the approximate solutions are shown to be good agreement with the numerical solution of this problem.
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Takaaki SHIZAWA, Shinji HONAMI
1983 Volume 49 Issue 448 Pages
2915-2921
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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Turbulent shear flows over a concave surface are subjected to complicating influences by extra rates of strain like streamwise curvature. In addition to these effects, turbulent boundary layers become strongly three-dimensional in the mean flow because of the formation of the counter rotating longitudinal vortices. The objective of the present paper is to clarify experimentally the effects of streamwise concave curvature on the turbulent boundary layer flows without substantial pressure gradient. Much attention is paied to the flow behaviors in response to the introduction of curvature. Momentum thickness Reynolds number is 2 900 and the ratio of the boundary layer thickness to radius of curvature, δ/R, is 0.046 at the start of curvature.
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Haruo YOSHIKI, Nobuhisa KAMIKAWA, Yasukata TSUTSUI, Nobuyuki TAKAMA
1983 Volume 49 Issue 448 Pages
2922-2928
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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This paper describes on theoretical and experimental pressure distributions around an airfoil placed in a periodically fluctuating air flow. As a result, the following facts are found out. (1) When the amplitude of fluctuating velocity is small, the time averaged pressure distributions are nearly equal to those in steady flows. (2) The amplitudes of fluctuating pressures increase approximately in proportion to that of air velocity. Furthermore, these values are farely well predicted by the flat plate airfoil theory. (3) The angle of lead of the pressure fluctuation to the velocity becomes smaller in the decelerating regions and larger in the accelerating regions. This fact is estimated insufficiently by the theory. (4) It becomes clear that it is necessary to consider the distribution of the airfoil thickness in order to caluculate the time averaged values and phase angles with good accuracy.
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Kyoji KAMEMOTO, Yosaku ODA, Masahiro AIZAWA
1983 Volume 49 Issue 448 Pages
2929-2936
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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The characteristics of the flow around a normal flat plate and a triangular prism near a plane surface has been investigated experimentally in the Reynolds number range of 10
2 to 3×10
4. From frequency analysis of hot wire signal of the wake flow in a wind tunnel, it was obtained that regular vortex shedding from the normal flat plate and the triangular prism was suppressed for all gaps less than about 0.6 and 0.37 cylinder widths respectively. Investigation of the time-mean distance between two shear layers in the vortex formation region demonstrated that the suppression of vortex shedding for both cylinders occured for gaps between the inner shear layer and the plane surface less than about 0.3 shear layer distances. Flow visualization experiments in a water thank revealed the structural differences of the wakes with and without vortex shedding.
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Shunji FUJIWARA, Shinichi YOKOYAMA, Hiroshi HATADA, Shigeaki MASUDA, I ...
1983 Volume 49 Issue 448 Pages
2937-2944
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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A measuring technique of wall shear stress based on the hot wire method is presented. Measurements were carried out in a two-dimensional turbulent channel flow, where a single hot wire sensor was placed close to the wall. Output voltage of a constant temperature anemometer was recorded with varying diameter, distance from the wall and temperature of the wire as well as Reynolds number of the flow. The measured results were compared with the standard values of wall shear stress obtained from the streamwise pressure gradient. Applicability of conventional calibration methods were examined. Finally, the new calibration curve was proposed where the heat conduction error and the additional heat loss due to the wall proximity were cancelled out by subtracting the heat loss without flow at the same position. The universality of the curve was confirmed in that it was quite independent of diameter, height and temperature of the wire.
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Hideo FUJITA, Hiroyuki TAKATA
1983 Volume 49 Issue 448 Pages
2945-2953
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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Casing treatment is known to improve the stall margin of axial compressors. However, it is known as well that casing treatment 16wers the efficiency of compressors. An experiment was planned in order to test a series of configurations of casing treatment which are supposed to have favourable effects and obtain the optimum ones, if any, judged from above-mentioned two stand-points : larger stall margin improvement and smaller lowering of efficiency. The result showed that the relation between the stall margin improvement and the compressor efficiency for all of the tested configurations falls on some smooth curved-line, and thus, there exists no particulary superior treatment configurations to others. It rather showed a certain amount of loss in efficiency was inevitable in order to obtain some required amount of stall margin improvement. Influence of rotor tip clearance on the effect of casing treatment was also examined. The result can be used as a guide for the selection of configurations in designing casing treatment.
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Keizo WATANABE, Toshiyuki IWATA, Hiroshi KATO
1983 Volume 49 Issue 448 Pages
2954-2962
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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The experiments for studying the hydraulic transport of solid are carried out by the spiral tube with three-shaped groove tube walls. The reduction of the pressure loss and the critical velocity is at most 50 %, and the experimental formula for the pressure loss and the critical velocity is obtained. The marked difference in the solid particle flow pattern between the straight and spiral tube, is shown by the flow visualization and the measurement of the solid particle concentration in the tube.
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Akira NARUMI, Seizo KATO, Hiroyuki TSUZUKU, Ko TERADA, Ryotaro IZUMI
1983 Volume 49 Issue 448 Pages
2963-2969
Published: December 25, 1983
Released on J-STAGE: March 28, 2008
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Flow characterisitic over a flat plate having finite width in turbulent flow is experimentally studied, and attention is given to the behavior of the edge-effect due to finite width. Flow measurements are carried out by a hot wire anemometer for the various geometries of flat plates having finite widths w=60, 90, 120 and 360 mm and finite thicknesses 2h=10∼40 mm. There always exists secondary flow at the side edge region of a flat plate with finite width, and it depends on plate thickness much more strongly than on plate width. The intensity of the edge-effect due to secondary flow is able to quantitatively estimated by a parameter of (θ/δ)* as defined in Eq. (2) .The region where flow character is affected by the edge-effect is also able to be good predicted by a empirical formula (1) proposed in this paper.
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