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1996 Fiscal Year Final Research Report Summary

Active Control of Rotating Stall by use of Swirl Breaker

Research Project

Project/Area Number 06555054
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section試験
Research Field Fluid engineering
Research InstitutionYokohama National University

Principal Investigator

KUROKAWA Junichi  Yokohama National Univ., Industrial Dept., Professor, 工学部, 教授 (40017976)

Co-Investigator(Kenkyū-buntansha) YAMAMOTO Kazuyoshi  Ebara Research Co., Ltd, Vice-president, 副所長(研究職)
KITAHORA Takaya  Yokohama National Univ., Industrial Dept., Assistant, 工学部, 助手 (30204910)
MATSUI Jun  Yokohama National Univ., Industrial Dept., Vice-Professor, 工学部, 助教授 (40251756)
Project Period (FY) 1994 – 1996
KeywordsSwirl breaker / Diffuser / Rotating stall / Fluid machinery / Internal flow / Unsteady phenomena / 非定常現象
Research Abstract

Rotating stall in a vaneless or a vaned diffuser not only makes the stably operating range of pumps, fans and compressors very narrow, but also gives severe damages to bearings, and thus many studies have been performed so far and the method has long been pursued to suppress this unstable phenomena. However, most of the methods so far proposed need complicated mechanisms, and thus reduce overall efficiency of a turbomachine. It is still strongly required to find a simple method of suppressing a rotating stall.
In order to passively control and suppress a rotating stall in a vaneless diffuser and in a vaned diffuser, a new device by use of radial shallow grooves is proposed and its effect is studied experimentally and theoretically. The results show that the radial grooves of 3 mm depth suppress a rotating stall completely in a vaneless and a vaned diffusers over almost all flow range. The radial grooves of only 1 mm depth on both sidewalls can also suppress a rotating stall.
Theoretical considerations have revealed that these tremendous effects of radial grooves are caused by two mechanisms ; one is a remarkable decrease of tangential velocity due to the mixing between the main flow and the groove flow, and the other is a remarkable increase of radial velocity due to the reverse flow in the grooves.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 松井・黒川・蓑・広木・北洞: "半径比の大きなベーンレスディフューザにおける特異な旋回失速" 日本機械学会論文集(B編). 61-591. 3842-3847 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松井・黒川・北洞・宮部: "スワールブレ-カによる羽根なしディフューザの旋回失速の制御" 日本機械学会流体工学部門講演論文集. 96-9. 91-92 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松井・黒川・北洞・目黒: "旋回失速発生時の羽根無しディフューザ内流れ" 日本機械学会第74期全国大会講演論文集Vol. 3. 96-15. 55-56 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山下・黒川・松井・北洞: "平行壁羽根なしディフューザの旋回失速の特異な挙動" 日本機械学会第74期通常総会講演論文集Vol. 3. 97-1. 308-309 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J., Matsui, J., Kurokawa, M., Mino, E., Hiroki and T., Kitahora: "Rotaing Stall in Vaneless Diffuser of Large Radius Ratio" Trans. JSME (B) (in Japanese). Vol.61, No.591. 3842-3847 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J., Matsui, J., Kurokawa, T., Kitahora and M., Miyabe: "Passive Contral of Rotating Stall in Parallel-Walled Vaneless Diffuser by Use of Swirl Breaker" Proc.of JSME Sympo. (in Japanese). No.96-9. 91-92 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J., Matsui, J., Kurokawa, T., Kitahora and N., Norihiko: "Flow in Vaneless Diffuser on Rotating Stall" Proc.of 74th JSME Sympo. (in Japanese). No.96-15 Vol.3. 55-56 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T., Yamashita, J., Kurokawa, J., Matsui and T., Kitahora: "Characteristics of Rotating Stall in Vaneless Diffuser of Large Radius Ratio" Proc.of 74th JSME Sympo. (in Japanese). No.97-1, Vol.3. (1997)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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