Transactions of the Japan Society of Mechanical Engineers
Online ISSN : 2185-9485
Print ISSN : 0029-0270
ISSN-L : 0029-0270
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Volume 25, Issue 149
Displaying 1-9 of 9 articles from this issue
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  • Recent Trend of Compressors and Fans
    Yoshiteru OSHIDA
    1959 Volume 25 Issue 149 Pages 1-3
    Published: January 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.1
    JOURNAL FREE ACCESS
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  • Experimental Study on Radial Turbine, with Special Reference to the Influence of the Number of Impeller Blades on Performance Characteristics
    Ichiro WATANABE, Toru ANDO
    1959 Volume 25 Issue 149 Pages 4-10
    Published: January 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.4
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    Experiments were conducted to ascertain the influence of the number of impeller blades on the performance characteristics of a radial turbine. Thus, impellers fitted with 4, 8, 16, 24 and 32 blades respectively were employed, and the radial turbine was driven by compressed air delivered from Roots blowers. Besides usual measurements of pressures and temperatures, the flow directions as well as the magnitudes of the absolute velocities at the entrance of the impeller were observed by a yaw meter. The following results were obtained. (1) The optimum number of impeller blades of a radial turbine is not less than that of a radial compressor. (2) At regions of maximum overall adiabatic efficiencies, the relative velocities at the entrance of the impeller incline rotationwise by the angles 20∼30 degrees.
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  • On Wakes behind a Single Aerofoil and Cascade
    Yasuo MORI
    1959 Volume 25 Issue 149 Pages 11-17
    Published: January 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.11
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    In an axial turbo-machinery, many cascades rotate in the downstream of the preceding cascade. The flow vector variation in the exit of the preceding cascade displays a marked variation of static pressure and flow pattern. It also brings about fatigue failure of cascade blades, generates noise and becomes a cause of losses. In order to predict and control losses in a cascade, it is necessary to analyse wake characteristics of a cascade and the performance of a cascade in non-steady flow. As a first step in the study of unsteady flow through or in a cascade, our experiment is concerned with wakes behind a two-dimensional single aerofoil and cascade. Experiments were made about wakes in transition and turbulent regions behind a single aerofoil and cascade of its chord 30 mm and the aspect ratio 3. The mean velocity and velocity fluctuation were measured by a pitot tube and a hot-wire anemometer. In the transition region, it was shown that a Tollmien-wave interacts with the organ-type acoustic vibration of cascade, and considerable static pressure variation exists in the wake. In the turbulent region, the wake flow is self-preserving even in the immediate neighbourhood of the transition region.
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  • On the Fundamental Formula of Non-Newtonian Flow
    Yukio TOMITA
    1959 Volume 25 Issue 149 Pages 17-23
    Published: January 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.17
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    In this paper, we deduce at first the fundamental equations of motion for pseudo-plastic and dilatant fluids. Secondly, it is proved that the equations of minimum dissipation of energy for these fluids are equivalent to the equations of motion, if inertia terms are neglected and external forces derived from a potential. Then, the flow past sphere is approximately solved using this energy method.
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  • A Treatise on the Screw Extrusion of Thermoplastics : Part I, Theory of the Screw Extrusion of Non-Newtonian Liquid
    Tsuyoshi HATTORI
    1959 Volume 25 Issue 149 Pages 23-29
    Published: January 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.23
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    Theories of the screw extrusion of highly viscous liquid have hitherto limited to the extrusion of the Newtonian liquid or the Bingham plastic liquid. The present paper describes the theory of extrusion of the Non-Newtonian liquid, of which viscosity may be represented by the power law [numerical formula] where D is the shear rate and τ is the shearing stress. The relation of the rate of pressure flow Qp and the pressure gradient ξ along the screw groove can be obtained by the following two equations. [numerical formula] where B=groove width h=groove depth V=relative velocity between barrel and screw [numerical formula] a=h1/h, b=(h-h1)/h and h1 is the distance between stress-neutral surface and the barrel. With the aid of K1∼a graph and K2∼a graph, which were previously obtained through numerical calculations, one can obtain a Qp∼ξ curve graphically by means of parameter a.
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  • A Treatise on the Screw Extrusion of Thermoplastics : Part II, Experimental Studies about the Extrusion of Polyethylene
    Tsuyoshi HATTORI, Masami SEKIGUCHI, Toshio MASHITA
    1959 Volume 25 Issue 149 Pages 29-35
    Published: January 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.29
    JOURNAL FREE ACCESS
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    This peper describes the experimental studies about the extrusion of polyethylene which has been conducted with 30 mm dia. extruder. The pressure distribution along the screw length has been measured, as well as the discharge pressure at the exit through several pressure measuring holes. With the flow rate and the pressure difference between both ends of every zone, which are divided by these holes, the state of flow in every zone is discussed.
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  • Study on the Venturi Scrubber : 4th Report, On the Pressure Recovery in Diffuser
    Yutaka UEOKA
    1959 Volume 25 Issue 149 Pages 36-42
    Published: January 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.36
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    The Venturi scrubber is being used successfully for the removal of micron and submicron particle matter, both in solid or liquid state, from gas stream. From a practical stand point the most important item to be considered in the operation of the Venturi scrubber is the amount of power required by the overall pressure drop across the unit. In the 2nd report, the pressure drop at the throat of Venturi scrubber was discussed. The present paper treats the theoretical and experimental studies on the pressure recovery in diffuser, and the influences of various factors are investigated. The results obtained reveal that the spray particles contained in gas stream contribute somewhat to the pressure rise, and the most suitable diversing angle is 3°∼4°.
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  • On the Effective Area and Stiffness of Bellous
    Toshio TAKENAKA
    1959 Volume 25 Issue 149 Pages 43-46
    Published: January 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.43
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  • Effect of the Trapping of Fluid between the Teeth of the Gear Pump
    Yoshinobu FUJII, Tsuneo ICHIKAWA, Masamichi HIRONO
    1959 Volume 25 Issue 149 Pages 46-50
    Published: January 25, 1959
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.25.46
    JOURNAL FREE ACCESS
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