Turbomachinery
Online ISSN : 1880-2338
Print ISSN : 0385-8839
ISSN-L : 0385-8839
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Volume 34, Issue 1
Displaying 1-3 of 3 articles from this issue
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Technical Papers
  • Suppression of Cavitation Surge in Inducer by the Casing with a Backflow Restriction Device
    Masataka NAKANO, Satoshi KAWASAKI, Hiroshi TOMARU
    2006 Volume 34 Issue 1 Pages 35-40
    Published: 2006
    Released on J-STAGE: May 16, 2007
    DOIhttps://doi.org/10.11458/tsj.34.35
    JOURNAL FREE ACCESS
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    The effects of the inlet casing with a backflow restriction device (BRD) on cavitation surge were examined. It was found that backflow cavitation volume fluctuation would be restrained by BRD, so that cavitation surge would be suppressed. The effects of a BRD configuration on cavitation surge were also examined.
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  • Flow Field with Tip Leakage Vortex in a Small Axial Fan
    Norimasa SHIOMI, Kenji KANEKO, Kazuyuki SHIMOZONO, Toshiaki SETOGUCHI
    2006 Volume 34 Issue 1 Pages 41-47
    Published: 2006
    Released on J-STAGE: May 16, 2007
    DOIhttps://doi.org/10.11458/tsj.34.41
    JOURNAL FREE ACCESS
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    In order to clarify the unsteady flow field with tip leakage vortex in a small axial fan, the experimental investigation was carried out. The small fan tested in this study is mainly used to cool the electronic parts. Therefore, it is required that its fan has high cooling capacity, i.e. high efficiency, and low noise level. In the present study, the velocity field measurements at rotor inlet and outlet using a single slant hot-wire probe and pressure field measurements on the casing wall using high response pressure transducers were performed. From these results, the tip leakage vortex features occurring in this fan was discussed.
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  • Study on Internal Flow in a Diagonal Flow Fan
    (Effect of Blade Loading on Flow Field with Rotating Stall Cell)
    Norimasa SHIOMI, Kenji KANEKO, Yoich KINOUE, Toshiaki SETOGUCHI
    2006 Volume 34 Issue 1 Pages 48-56
    Published: 2006
    Released on J-STAGE: May 16, 2007
    DOIhttps://doi.org/10.11458/tsj.34.48
    JOURNAL FREE ACCESS
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    In order to clarify the effect of blade loading on the flow fields including a rotating stall cell, the structure and behavior of a rotating stall cell were experimentally investigated in the diagonal flow fans with different blade loading. The total pressure-rise coefficient at design flow-rate for each fan is 0.250 and 0.345. The static pressure on outer casing and the total pressure at rotor inlet were measured using a high responded pressure transducer.The measured data were processed by the use of DPLA technique, and the structure and behavior of a rotating stall cell were obtained for each fan. As a result, the size of stall cell becomes large for circumferential and radial direction and the propagating speed of stall cell becomes slow, as the blade loading increases. However, when the blade loading increase, large diffences are not seen for the basic structure, propagating form and the features of the flow fields with a rotating stall cell.
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