Turbomachinery
Online ISSN : 1880-2338
Print ISSN : 0385-8839
ISSN-L : 0385-8839
Volume 31, Issue 8
Displaying 1-6 of 6 articles from this issue
  • Tadashi TANUMA, Shin-ichiro NAGAO, Satoru YAMAMOTO
    2003 Volume 31 Issue 8 Pages 453-458
    Published: August 10, 2003
    Released on J-STAGE: July 11, 2011
    JOURNAL FREE ACCESS
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  • Sang-In JUN, Takashi TOKUMASU, Kenjiro KAMIJO
    2003 Volume 31 Issue 8 Pages 459-466
    Published: August 10, 2003
    Released on J-STAGE: July 11, 2011
    JOURNAL FREE ACCESS
    Effect of compressibility of liquid hydrogen on dynamic response of a high pressure LH2 turbopump system including pipes has been analyzed. Simulation results of a nonlinear compressible mathematical model have been compared with those of a nonlinear incompressible mathematical model. Design parameters of LE-7 engine were used to simulate steady state condition and the boundary condition of tank pressure as well as pump outlet pressure was controlled to simulate unsteady condition. Effects of dynamic characteristics parameters of a cavitating inducer such as cavitation compliance and mass flow gain factor on dynamic response of a compressible flow system were analyzed as well.
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  • Katsumi CHIBA, Yukio ITO, Shinichi TAMURA
    2003 Volume 31 Issue 8 Pages 467-473
    Published: August 10, 2003
    Released on J-STAGE: July 11, 2011
    JOURNAL FREE ACCESS
    There exists a wide variety of the so-called shear pumps that are designed for various applications in the wide fields of foods, medicines, chemicals and so on. In order to establish a useful method to monitor the cavitation behavior, we measured the cavitation noise, the vibrational acceleration and the upstream wall fluctuating pressure in the shear pump, in relation to the discharge, the net positive suction head and the fluid viscosity. The cavitation behavior can be monitored by detecting the noise, the acceleration level and the fluctuating pressures corresponded well with the cavitation development.
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  • Mitsuo UNO, Taichiro ISHIHARA, Takaaki MASUZOE
    2003 Volume 31 Issue 8 Pages 474-481
    Published: August 10, 2003
    Released on J-STAGE: July 11, 2011
    JOURNAL FREE ACCESS
    This paper presents on stability of a vertical shaftless centrifugal pump with floating impeller by use of non-contact magnetic drive. Considering the axial thrust by the pressure difference between shroud and disk side of impeller, a centrifugal pump with floating impeller was realized. In order to make an investigation into stable operating condition of floating impeller, the relationship between pressure fluctuation and floating condition of a shaftless centrifugal pump impeller was made clear by experimental research. In this study, the wall pressure and floating distance on impeller were measured by transducer with high frequency response. Using the time dependent data to get the data acquisition system, the statistical and spectral analysis was carried out. From these results, it was proven that the condition of floating impeller became unstable decreasing the flow rate in the effect of the pressure fluctuation.
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  • Shinya GOTO, Satoshi YAMAGUCHI, Hidefumi NAKAO, Hiroshi YAMAGUCHI, Fus ...
    2003 Volume 31 Issue 8 Pages 482-492
    Published: August 10, 2003
    Released on J-STAGE: July 11, 2011
    JOURNAL FREE ACCESS
    An effective casing treatment was developed in order to satisfy the requirement of the wide flow range for turbocharger compressors. The surge margin of a compressor was expanded by the casing treatment with the inclined vanes in the cavity. The surge flow rate was 20% smaller than that of the conventional casing treatment at the pressure ratio of 3.0. The flow measurements and CFD analysis in the impeller with the casing treatment were carried out. At the low flow rate, the reversed flow through the cavity with the inclined vanes developed the counter swirl flow at the impeller inlet. The counter swirl flow caused an increase of the work coefficient. Consequently, the recirculation flow was increased as the compressor fl ow rate was reduced and the surge margin was improved significantly.
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  • [in Japanese]
    2003 Volume 31 Issue 8 Pages 493-507
    Published: August 10, 2003
    Released on J-STAGE: July 11, 2011
    JOURNAL FREE ACCESS
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