Singular Behavior of Critical Reynolds Number Rec within the Working Section of Cavitation Tunnel When the Blockage Factor Is Extremely Large.

• KOBAYASHI Takeharu

  埼玉工業大学大学院

• UCHIYAMA Tsunehisa

  埼玉工業大学先端科学研究所

• OBA Risaburo

  埼玉工業大学先端科学研究所

Bibliographic Information

Other Title

• 大ブロッケージ係数の場合のキャビテーション試験水槽測定部内の遷移レイノルズ数の特異な挙動

Abstract

In order to clarify the wall effects upon Re_cso often observed in valve experiments, we take up a simple flow around a circular cylinder of diameter d set within a two-dimensional channel of hight h, when the blockage factor B=d/h=0.75. And systematical measurements are made for the upstream-and the downstream-velocity distribution around the cylinder, by means of an PIV-technique, resulting in time-averaged nondimensional velocity change Δu/u₁, in proportion to the drag coefficient with respect to Reynolds number Re. In the present case of extremely high B-Re_c is unexpectedly reduced about one figure than the small B-counterparts.

Journal

• Turbomachinery

  Turbomachinery 31 (2), 91-96, 2003

  Turbomachinery Society of Japan

Keywords

• Cavitation
• Bubble
• Transition
• Flow Visualization
• Wall Effects

Details

• CRID: 1390282679521191552
• NII Article ID: 130003977261
• DOI: 10.11458/tsj1973.31.91
• ISSN: 18802338
• ISSN: 03858839
• Text Lang: ja
• Data Source:
  • JaLC
  • CiNii Articles
• Abstract License Flag: Disallowed