Turbomachinery
Online ISSN : 1880-2338
Print ISSN : 0385-8839
ISSN-L : 0385-8839
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Volume 34, Issue 5
Displaying 1-2 of 2 articles from this issue
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Technical Papers
  • Stability of the Floating Impeller in Shaft-less Centrifugal Pump
    (Effects of J-Groove Treatment on the Pump Characteristics)
    Ryunosuke KAWASHIMA, Mitsuo UNO, Yoshio MIYAIRI
    2006 Volume 34 Issue 5 Pages 294-300
    Published: 2006
    Released on J-STAGE: May 16, 2007
    DOIhttps://doi.org/10.11458/tsj.34.294
    JOURNAL FREE ACCESS
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    By using the non-contact magnetic drive, the shaft-less centrifugal pump was developed. The most unique characteristics is that there is no shaft and bearing which contact water. The impeller rotate in independent condition without fluids force and magnetic retention. Near the design point, the impeller rotate stable, but in low flow rate condition, the impeller can not keep stable. Therefore, the impeller oscillates above and below with contacting casing wall. In this study, we tried to control the attitude of floating impeller by using the J-groove. As a result, the effects on pump performance, pressure distribution and impeller attitude were made clear.
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  • Trial of Numerical Simulation of Surging by Using an Equation Treatment Program
    Jun TANABE, Koji NAKAGAWA
    2006 Volume 34 Issue 5 Pages 301-308
    Published: 2006
    Released on J-STAGE: May 16, 2007
    DOIhttps://doi.org/10.11458/tsj.34.301
    JOURNAL FREE ACCESS
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    Unsteady flow phenomenon called surging occurs in a pipe system with a turbo type compressor or a fan as a pressure source when operation flow rate is smaller than a certain limit. During this phenomenon, a noise occurs, and when the phenomenon is excessive, it may result in damages on the apparatus. It is useful to predict the surging fluctuation before operation. A centrifugal fan system is replaced by a lumped-parameter model and a series of numerical simulation was carried out by changing parameters. In this simulation a equation treatment program was used. To verify the results a series of experiments have been done. A centrifugal fan pipe system of maximum pressure rise of 2.1 kPa with the flow rate of 3 m3/min is used in the experiments. Comparison between simulated results and experiment showed good agreement for surging frequency and 10 % error for pressure fluctuation amplitude.
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