Turbomachinery
Online ISSN : 1880-2338
Print ISSN : 0385-8839
ISSN-L : 0385-8839
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Volume 34, Issue 8
Displaying 1-3 of 3 articles from this issue
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Technical Papers
  • Measurement and Prediction of Critical Velocity of Siphon Formation in Actual Pump
    Kazuo URANISHI, Masashi IKEZAWA, Shigeyuki TOMIMATSU
    2006 Volume 34 Issue 8 Pages 456-462
    Published: 2006
    Released on J-STAGE: August 23, 2007
    DOIhttps://doi.org/10.11458/tsj.34.456
    JOURNAL FREE ACCESS
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    Siphon piping has been improved for the decreasing of construction costs. Although the examination by model piping is carried out about siphon formation, there are a few experimental reports using the actual pumpimg system. In this report, siphon formation which used the vertical mixed flow pump with discharge bore size 1,500mm was examined, and it turns out that the starting flow velocity of siphon formation is smaller than 1 m/s usually said. This is based on the increasing of the pump capacity by the delivery of the air remained in siphon piping. Moreover, the prediction of the air discharge time in a pipe showed that an air discharge model based on the flow pattern was a key factor.
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  • Application of Circular Casing to the Centrifugal Pump of Low Specific Speed and the Internal Flow
    Jun MATSUI, Kenichiro NAGAHAMA, Shusaku KAGAWA, Junichi KUROKAWA, Youn ...
    2006 Volume 34 Issue 8 Pages 463-470
    Published: 2006
    Released on J-STAGE: August 23, 2007
    DOIhttps://doi.org/10.11458/tsj.34.463
    JOURNAL FREE ACCESS
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    Performance and flow field of the centrifugal pump, whose type number is 0.244, are analyzed by both experimental and numerical methods. A circular casing with the very small radius shows the high head and efficiency as that of spiral casing. CFD results on the circular casing case show that the flow from the impeller goes out through only the small area near the tongue, even at the best performance status. Also, there is very strong unsteadiness in the flow. These flow field is very different from that of ordinary spiral casing.
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  • Water Level Fluctuation in Pump Sump with Coupled Pit and Countermeasures Against Harmful Vortices
    Masashi OHBUCHI, Masashi TAGOMORI
    2006 Volume 34 Issue 8 Pages 471-476
    Published: 2006
    Released on J-STAGE: August 23, 2007
    DOIhttps://doi.org/10.11458/tsj.34.471
    JOURNAL FREE ACCESS
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    In the case of pump sump consist of mirror symmetrical couple pits, alternative fluctuation of water levels of each pit was observed. This phenomenon was caused by fluctuation of flow pattern at expanding duct upstream of pump pits. In this report, we demonstrate that modern CFD result could predict this phenomenon.
    Also, we describe about some mechanism of submerged and air-entrained vortices in the pits, and demonstrate practical contermeasures of these destructive vortices.
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