Turbomachinery
Online ISSN : 1880-2338
Print ISSN : 0385-8839
ISSN-L : 0385-8839
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Volume 32, Issue 8
Displaying 1-7 of 7 articles from this issue
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Reviews
Technical Papers
  • Experimental Study on Surge Inception in a Centrifugal Compressor
    Hideaki TAMAKI, Hidefumi NAKAO, Takeshi AIZAWA
    Article type: Others
    Subject area: Others
    2004 Volume 32 Issue 8 Pages 466-472
    Published: 2004
    Released on J-STAGE: August 12, 2005
    DOIhttps://doi.org/10.11458/tsj.32.466
    JOURNAL FREE ACCESS
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    An investigation of surge inception in a centrifugal compressor was done with measurements of steady and unsteady static pressure. Vaneless diffuser and vaned diffuser were tested. Analyses of the static pressure and the pressure fluctuation showed that stall at the impeller leading edge occurred at first, and then it extended to downstream. In case of the vaneless diffuser, deterioration of the pressure rise in the impeller triggered instability. For the vande diffuser, instability that was generated in the impeller propagated into the vaned diffuser, however the pressure recovery by the vaned diffuser made the operation of the compressor stable at low flow rate.
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  • Study on Performance and Internal Flow of Cross-Flow Wind Turbine
    Kazuki TAKEUCHI, Junichiro FUKUTOMI, Hidetoshi KODANI, Hironori HORIGU ...
    Article type: Others
    Subject area: Others
    2004 Volume 32 Issue 8 Pages 473-481
    Published: 2004
    Released on J-STAGE: August 12, 2005
    DOIhttps://doi.org/10.11458/tsj.32.473
    JOURNAL FREE ACCESS
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    The cross-flow wind turbine has high torque and low speed characteristics and the structure are very simple. However, even if the power coefficient is high, it is about 10%. In this research, the performance of a cross-flow turbine simple substance and the flow state of the circumference of a rotor, and the internal flow were first cleared up for the purpose of the improvement in a performance of a cross-flow wind turbine. Furthermore, in order to raise a power coefficient, cylindrical casing which has a nozzle and diffuser was installed. And the following conclusions were obtained, 1. The flow at inlet or outlet of the cross-flow wind turbine is not suitable for the design point. 2. The Power Coefficient was raised 1.5 or 2.0 (with the obstacle plate) times to adapt to the cylindrical casing. 3. The optimal arrangement of nozzle and diffuser was determined by experimental studies.
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  • Effects of Turbulent Inflow on Aerodynamic Loads of a Horizontal Axis Wind Turbine Rotor
    Yutaka HASEGAWA, Hiroshi IMAMURA, Kai KARIKOMI, Naoyuki YONEZAWA
    Article type: Others
    Subject area: Others
    2004 Volume 32 Issue 8 Pages 482-488
    Published: 2004
    Released on J-STAGE: August 12, 2005
    DOIhttps://doi.org/10.11458/tsj.32.482
    JOURNAL FREE ACCESS
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    Wind turbines, which are installed under the natural wind conditions, suffer complicated loads on the rotor blades due to the turbulent wind. The present paer describes a numerical method for calculating the effects of turbulence characteristics on the aerodynamic loads, and shows the numerical results. The turbulent wind field for the present calculation is simulated with the Veer's model, which is based on a Fourier synthesis method and capable of considering spatial cross-correlations between any two points in the rotor plane, where the turbulent wind is generated. An inviscid aerodynamic model based on an asymptotic acceleration potential method is adopted for the calculation of aerodynamic loads on the rotor blades.
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