Turbomachinery
Online ISSN : 1880-2338
Print ISSN : 0385-8839
ISSN-L : 0385-8839
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Volume 31, Issue 9
Displaying 1-7 of 7 articles from this issue
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  • Two-Standardized Low Head Propeller Turbines in Series Arrangement
    Takeshi SASANAMI, Yasumi KIZAKI
    2003 Volume 31 Issue 9 Pages 513-519
    Published: September 10, 2003
    Released on J-STAGE: July 11, 2011
    DOIhttps://doi.org/10.11458/tsj1973.31.513
    JOURNAL FREE ACCESS
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  • 2 Wings Mixed Flow Fan for the Outdoor Unit of a Room Air Conditioner
    Takashi SUGIO
    2003 Volume 31 Issue 9 Pages 520-524
    Published: September 10, 2003
    Released on J-STAGE: July 11, 2011
    DOIhttps://doi.org/10.11458/tsj1973.31.520
    JOURNAL FREE ACCESS
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  • Radial Turbine Integrated Centrifugal Compressor
    Tetsuya MATSUMOTO
    2003 Volume 31 Issue 9 Pages 525-528
    Published: September 10, 2003
    Released on J-STAGE: July 11, 2011
    DOIhttps://doi.org/10.11458/tsj1973.31.525
    JOURNAL FREE ACCESS
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  • Tip Vortex Feature in an Open Axial Fan
    Norimasa SHIOMI, Kenji KANEKO, Wen-Xin CAI, Keisuke SASAKI, Toshiaki S ...
    2003 Volume 31 Issue 9 Pages 545-553
    Published: September 10, 2003
    Released on J-STAGE: July 11, 2011
    DOIhttps://doi.org/10.11458/tsj1973.31.545
    JOURNAL FREE ACCESS
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    In order to clarify the tip vortex features occurring in an open fan without an outer casing, the experimental investigation was carried out for two types of rotor blade. One has the radial straight leading edge similar to the ducted fan blade, and the other has the forward curved leading edge mainly used in a room ventilation fan blade. The flow fields around each rotor were measured using the two-components LDV system. The structure and behavior of the tip vortex for each rotor were clarified and the differences of the tip vortex nature were discussed. As a result, it is shown that the features of the tip vortex occurring in an open fan are affected by the blade shapes and the blade loading parameter.
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  • Experimental Study on Water Turbine Characteristics of Darrieus Type Runner with Staggered Blade Arrangement
    Kusuo OKUMA, Akinori FURUKAWA, Mitsuru IKEDA, Yuko MATSUDA, Satoshi WA ...
    2003 Volume 31 Issue 9 Pages 554-561
    Published: September 10, 2003
    Released on J-STAGE: July 11, 2011
    DOIhttps://doi.org/10.11458/tsj1973.31.554
    JOURNAL FREE ACCESS
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    There are lots of sites with low head less than 2m such as rivers and wasted water flows. The effective utilization of low head water power as local energy source is becoming more and more vital. However, these extra-low head hydropower have been abandoned due to poor cost-effectiveness of conventional turbines. The Darrieus-type water turbine has been proposed as a suitable one for low head utilization due to its low-cost and simple structure. In the present paper, a ducted Darrieustype water turbine with a staggered blade arrangement is investigated experimentally to improve the torque variation in one revolution of the runner and the stable operation in the case of convergent walled inlet casing, giving high runner efficiency in comparison with a parallel walled inlet casing. Results of staggered and normal blade arrangements are compared in cases of parallel and convergent inlets. The turbine characteristics are made clear and discussed from the standing point of practical use.
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  • Suppression of Cavitation in a Francis Turbine Runner Using 3D Inverse Design Method
    Hidenobu OKAMOTO, Akira GOTO
    2003 Volume 31 Issue 9 Pages 562-567
    Published: September 10, 2003
    Released on J-STAGE: July 11, 2011
    DOIhttps://doi.org/10.11458/tsj1973.31.562
    JOURNAL FREE ACCESS
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    This paper describes a new design method of blade geometry for a Francis turbine runner by using a three-dimensional inverse design method and the Computational Fluid Dynamics (CFD) technique. The design objectives are the suppression of cavitation by reducing the area in which static pressure is lower than the vapor pressure while keeping the efficiency high. In the inverse design method, it is possible to optimize the static pressure distribution in the runner by controlling blade loading parameters and/or stacking condition, which is related to a blade lean angle, for the same design specification. A Francis turbine runner was re-designed by the inverse design method for different blade loading and stacking conditions, and the flow fields were evaluated by applying CFD. It was confirmed that the present design method is very practical and effective to control low pressure region and achieve high efficiency for Francis turbine runners.
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  • [title in Japanese]
    [in Japanese]
    2003 Volume 31 Issue 9 Pages 568-574
    Published: September 10, 2003
    Released on J-STAGE: July 11, 2011
    DOIhttps://doi.org/10.11458/tsj1973.31.568
    JOURNAL FREE ACCESS
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