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Active Control of Blade Tip Flow in Turbomachinery

Research Project

Project/Area Number 09555066
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Fluid engineering
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

INOUE Masahiro  Kyushu University, Graduate School of Engineering, Professor, 工学研究科, 教授 (90037903)

Co-Investigator(Kenkyū-buntansha) UCHIDA Sumio  Mitsubishi Heavy Industries, LTD., Takasago Research & Development Center, Senior Research Engineer, 高砂研究所, 主任研究員
HARA Kazuo  Kyushu University, Graduate School of Engineering, Research Associate, 工学研究科, 助手 (00150491)
FURUKAWA Masato  Kyushu University, Graduate School of Engineering, Associate Professor, 工学研究科, 助教授 (30181449)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥10,400,000 (Direct Cost: ¥10,400,000)
Fiscal Year 1999: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1998: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1997: ¥5,500,000 (Direct Cost: ¥5,500,000)
KeywordsTurbomachinery / Blade Tip Flow / Active Control / Cascade / Tip Leakage Vortex / アクティブ制御 / 圧縮機 / 動翼列 / 漏れ渦
Research Abstract

The onset of the discrete tip leakage vortex is located on the suction surface at some distance from the leading edge. The vortex core with high vorticity is generated from a shear layer between the leakage jet flow and the main flow. The streamlines in the leakage flow are coiling around the vortex core. All the vortex-lines in the tip leakage vortex core link to ones in the surface boundary layer. The other vortex-lines in the suction surface boundary layer link to the vortex-lines in the pressure surface boundary layer and in the casting wall boundary layer. There are two mechanisms to reduce intensity of the tip leakage vortex : one is reduction of discharge vorticity caused by the linkage of vortex-lines between the suction surface and casting wall boundary layers, and another is diffusion of vorticity from the tip leakage vortex.
The breakdown of the leakage vortex occurs inside the rotor at a lower flow rate than the peak pressure rise operating condition. The breakdown is characterized by the existence of the stagnation point followed by a bubble-like recirculation region. The onset of breakdown causes significant changes in the nature of the tip leakage vortex : large expansion of the vortex and disappearance of the streamwise vorticity concentrated in the vortex. The expansion has an extremely large blockage effect extending to the upstream of the leading edge. The disappearance of the concentrated vorticity results in no rolling-up of the vortex downstream of the rotor and the disappearance of the pressure trough on the casting. It is found that the leakage vortex breakdown plays a major role in characteristic of rotor performance at near-stall conditions. As the flow rate is decreased from the peak pressure rise operating condition, the breakdown region grows rapidly in the streamwise, spanwise and pitchwise directions. The growth of the breakdown causes the drastic rises in the blockage and the loss.

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] Kazuo HARA: "A Tip Clearance Vortex Model in Axial Flow Machines"Proceedings of the 5th Asian Intern. Conf. on Fluid Machinery. III. 655-662 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Masahiro INOUE: "Physical Explanations of Tip Leakage Flow Fields in an Axial Compressor Rotor"ASME Paper. 98・GT・91. 1-12 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 原 和雄: "軸流ターボ機械の翼端漏れ渦の循環評価モデル"ターボ機械. 27-2. 103-109 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Masato FURUKAWA: "The role of Tip Leakage Vortex Breakdown in Compressor Rotor Aerodynamics"ASME Journal of Turbomachinery. 121-3. 469-480 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kazuo,HARA: "A Tip Clearance Vortex Model in Axial Flow Machines"Proceedings of 5th Asian Intern. Conf. On Fluid Machinery. Vol. III. 655-662 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Masahiro,INOUE: "Physical Explanations of Tip Leakage Flow Fields in an Axial Compressor Rotors"ASME Paper. No. 98-GT-091. 1-12 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kazuo,HARA: "A Circulation Rate Evaluation Model of Tip-Clearance Vortex in Axial Trubomachines"Turbomachinery. Vol. 27, No. 2. 103-109 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Masao, Furukawa: "The Role of Tip Leakage Vortex Breakdown in Compressor Rotor Aerodynamics"Trans. of ASME, J. of Trubomachinery. Vol. 121, No. 4. 469-480 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 原 和雄: "軸流ターボ機械の翼端漏れ渦の循環評価モデル"ターボ機械. 27-2. 103-109 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Masato FURUKAWA: "The Role of Tip Leakage Vortex Breakdown in Comprssor Rotor Aerodynamics"ASME Journal of Turbomachinery. 121-3. 469-480 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Masahiro,INOUE: "Physical Explanations of Tip Leakage Flow Fields in an Axial CompreSsor Rotor" ASME Paper. 98-GT-91. 1-12 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Masato FURUKAWA: "The Role of Tip Leakage Vortex Breakdown in Compressor Rotor Aerodynamics" ASME Paper. 98-GT-239. 1-14 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Kazuo HARA: "A Tip Clearance Vortex Model in Axial Flow Machines" Proceedings of 5th Asian Intern.Conf.on Fluid Mechinery. III. 655-662 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 才木 一寿: "圧縮機動翼列における翼先端漏れ渦の形成過程" 日本機械学会講演論文集. 978-2. 257-259 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 古川 雅人: "軸流圧縮機動翼列の翼先端漏れ流れ場の構造(ケーシング面と動翼の相対運動の効果)" ターボ機械協会 宇部地方講演論文集. 7-12 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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