Turbomachinery
Online ISSN : 1880-2338
Print ISSN : 0385-8839
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Volume 43 , Issue 7
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Technical papers
  • Kohei YAMAMOTO, Koichi ISHIZAKA, Satoshi WATANABE, Shinichi TSUDA, Aki ...
    Type: Technical papers
    Volume 43 (2015) Issue 7 Pages 425-432
    Released: February 11, 2018
    JOURNALS FREE ACCESS
    In our previous study, it has been found that installing an axi-asymmetrical baffle plate upstream of cavitating inducer is very effective for the suppression of cavitation surge in two-bladed flat plate helical inducer. In the present study, to obtain the design guideline of this suppression device, it was applied for the suppressions of cavitation surge and rotating cavitation in a three-bladed inducer. It was confirmed that the cavitaion surge could be well suppressed by this device, especially when installed at about 55% tip diameter upstream of inducer leading edge; this location is similar to that for the effective suppression in two-bladed inducer. Rotating cavitation could be also weakened by this device, but the effect was very limited.
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  • Masaaki HORIE, Motoki TSUJIUCHI, Masaya MIZOKOSHI
    Type: Technical papers
    Volume 43 (2015) Issue 7 Pages 433-441
    Released: February 11, 2018
    JOURNALS FREE ACCESS
    Many of serious left ventricle failure patients suffer from right ventricle disease, therefore, right ventricle assist blood pump is necessary for bridge to transplantation. Moreover, the designing of the right ventricular assist centrifugal blood pump by conventional pump design method is difficult, as the specific speed is low, as well as the left ventricular assist centrifugal blood pump. In the present study, the shape of the right ventricular assist centrifugal blood pump, which has gradual pressure drop characteristic within the range of adult blood flow rate, was investigated by the CFD analysis. As a result, it was found that suitable pressure for assisting the right ventricular by adopting appropriate volute and vane shape is obtained, and the maximum pump efficiency is about 45%, which doesn't increase even if various vane shapes are changed.
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