Turbomachinery
Online ISSN : 1880-2338
Print ISSN : 0385-8839
ISSN-L : 0385-8839
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Volume 32, Issue 6
Displaying 1-7 of 7 articles from this issue
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Reviews
Technical Papers
  • Experimental Research for Performance Improvement and Noise of Axial Flow Fan
    Tadashi KOZU, Takahiro NISHIOKA, Tsukasa NAGANO
    Article type: Others
    Subject area: Others
    2004 Volume 32 Issue 6 Pages 343-350
    Published: 2004
    Released on J-STAGE: August 12, 2005
    DOIhttps://doi.org/10.11458/tsj.32.343
    JOURNAL FREE ACCESS
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    An experimental research on axial flow fan was carried out in order to improve performance and reduce noise. Based on measurement of internal flow and CFD analysis, new casing figure and modified vortex design were proposed. New casing figure which had modified convergent rate at just upstream of 1st blade row achieved uniform incoming flow and lead to 2.7% efficiency up and 4 dB noise reduction. Modified vortex design improved blade element performance and lead to 2.6% efficiency up, but caused noise increase of 2.7 dB. Consequently, the efficiency was improved significantly and the noise was reduced by proposed new casing.
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  • Study on Noise Reduction of Turbo Fan
    (Effects of Leading Edge Radius of Fan Blades on Noise Characteristics)
    Kiyoshi KAWAGUCHI, Kenichi OKUI
    Article type: Others
    Subject area: Others
    2004 Volume 32 Issue 6 Pages 351-360
    Published: 2004
    Released on J-STAGE: August 12, 2005
    DOIhttps://doi.org/10.11458/tsj.32.351
    JOURNAL FREE ACCESS
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    A turbo fan is generally used for compact type air conditioning equipments with narrow flow channels because of having high static pressure characteristics. However a turbo fan is desired for noise reduction because of the high pressure. This paper described the effects of leading edge radius of turbo fan blades on noise characteristics, and the effects of scroll shape and clearance between scroll and impeller on noise. In consequence we clarified that the pressure fluctuation at the leading edge due to the flow turbulence at inlet flow, and that the fan noise can be reduced by the impeller having large radius of leading edge of blades considerably.
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  • Study on Abnormal Axial Thrust of High-Head Pump-Turbine at Load Rejection
    Junichi KUROKAWA, Morihito INAGAKI, Tadashi TAGUCHI, Jun MATSUI, Hiros ...
    Article type: Others
    Subject area: Others
    2004 Volume 32 Issue 6 Pages 361-371
    Published: 2004
    Released on J-STAGE: August 12, 2005
    DOIhttps://doi.org/10.11458/tsj.32.361
    JOURNAL FREE ACCESS
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    In the load rejection test of Kazunogawa Pumped-Storage P. S, an abnormal axial thrust occurred in a high-head reversible pump-turbine (412 MW and 714 m effective head). The rotating parts of 600 tons including a runner moved 4 mm upward in the axial direction. After taking several countermeasures, this machine is now operating without any problem, but the cause and the mechanism of abnormal axial thrust are not yet clear, though such a transient up-thrust has long been known. The present study is thus aimed to determine the reason why such abnormal axial thrust is caused at transient operation and how to reduce abnormal thrust. Here adopted is a theoretical approach which has been proved to give satisfactory results in predicting pump thrust. The calculated results under various operating conditions revealed the cause and detailed mechanism together with some effective countermeasures against abnormal axial thrust.
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