Specific Internal Flow in Balancing Hole

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  • YAMASHITA Yosuke
    横浜国立大学　大学院　理工学府　機械・材料・海洋系工学専攻
  • MATSUI Jun
    横浜国立大学　大学院　工学研究院
  • OKUBO Atsushi
    横浜国立大学　大学院　工学府　システム統合工学専攻

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Other Title
  • バランスホールにおける特異な内部流れ
  • バランスホール ニ オケル トクイ ナ ナイブ ナガレ

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Abstract

<p>In order to research the discharge coefficient of a balancing hole Cd for a wide range of axial flow velocity v in the hole and rotational speed u, we carried out CFD simulations. Some of the results and the reported experimental data agree within the difference of about 5.3% on the pressure difference of the hole. Flow in a balancing hole is influenced by not only v but also u. Therefore the parameter v/u is considered as an important parameter of Cd. Furthermore, for very low range of v/u, we found a rare flow situation with S-shaped streamlines. Due to the strong pumping effect by rotating disk, Cd is greatly different in this region.</p>

Journal

  • Turbomachinery

    Turbomachinery 47 (12), 723-729, 2019

    Turbomachinery Society of Japan

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