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2001 Fiscal Year Final Research Report Summary

Numerical Investigation of Unsteady Flow in an Axial Flow Turbomachineries

Research Project

Project/Area Number 12555046
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Fluid engineering
Research InstitutionOsaka University

Principal Investigator

MIYAKE Yutaka  Dept. Mech. Eng., Osaka University, Professor, 大学院・工学研究科, 教授 (50029005)

Co-Investigator(Kenkyū-buntansha) OHTA Takashi  Dept. Mech. Eng., Osaka University, Research Associate, 大学院・工学研究科, 助手 (10273583)
TSUJIMOTO Koichi  Dept. Mech. Eng., Osaka University, Research Associate, 大学院・工学研究科, 助手 (10243180)
KAJISHIMA Takeo  Dept. Mech. Eng., Osaka University, Associate Professor, 大学院・工学研究科, 助教授 (30185772)
Project Period (FY) 2000 – 2001
KeywordsAxial Flow Fan / Rotating Stall / Numerical Simulation / Turbomachinery / Vortex Shading / Cascade / Unsteady Flow / Leakage Flow
Research Abstract

Operation of an axial flow turbomachineries falls into unstable for low flow rate conditions because of the head increase with flow. Prediction of stall and understanding of unsteady feature with stall is essential for the design of such fluid machineries. However, the industrial design is based on some empirical law. In our study, we reproduced numerically the flow with stall cell by means of the direct numerical simulation technique and investigated the mechanism of unsteady flow. With a limitation of current computers, we applied the parallel computation to flows in multiple passages of single-stage rotor without stator. Two kinds of cascade are selected because the experimental data were available. For small aspect ratio and small number of blades, the numerical result did not show a stall cell even for the stall condition in experiment. On another condition, clear and developed stall cells were obtained, which may be the first success by the numerical simulation. Although the quantitative agreement between numerical and experimental results was not sufficient due to the lack of computational resolution, we believe it agrees qualitatively with experimental observation. It was found that the stall cell had a vortex structure stretched into the upstream direction from the cascade. We think the propagation of it is not caused by the blocking effect by the cell, but the convection of vortex. This suggests the estimation of rotating velocity of cell should be reconsidered.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 大西 正: "薄肉翼の翼列性能に及ぼす前縁形状の影響に関する数値的解析"日本機械学会論文集B編. 67-659. 1640-1646 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miyake, Y.: ""Structure and propagation of a Stall Cell in a Rotor of an Axial Flow Fan""9th International Symposium of Transport Phenomena and Dynamics of Rotating Machinery, Honolulu. (CD-ROM)No.FD-AB S-003. (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miyake, Y.: ""Numerical and Experimental Study of Three-Dimensional Flow structure in a Diagonal Flow Fan with Radial Vaneless Diffuser""9th International Symposium of Transport Phenomena and Dynamics of Rotating Machinery, Honolulu. (CD-ROM)No.FD-AB S-079. (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Okita, K: ""Three-Dimensional Computation of Unsteady Cavitating Flow in a Cascade""9th International Symposium of Transport Phenomena and Dynamics of Rotating Machinery, Honolulu. (CD-ROM)No.FD-AB S-076. (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 出口智如: "軸流羽根車の旋回失速の数値シミュレーション"日本機械学会論文集B編. (投稿中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 沖田浩平: "翼まわりの非定常キャビテーション流れの数値シミュレーション"日本機械学会論文集B編. 68-667(掲載予定). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tadashi Ohnishi, Yutaka Miyake and Kanjiro Kinosita: "Numerical of Effect of Lading Edge Configuration on Cascade Characteristics of Thin Arc Airfoil"Tans. JEME (Ser.B). 67-659. 1640-1646

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Miyake, Y. and Deguchi, T.: "Structure and Propagation of a Stall Cell in a Rotor of an Axial Flow Fan"9th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Honolulu. CD-ROM No.FD-ABS-003. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Miyake, Y., Ohnishi, T., Kinoshita, K. and Kamada, M.: "Numerical and Experimental Study of Three-Dimensional Flow Structure in a Diagonal Flow Fan with Radial Vaneless Diffuser"9th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Honolulu. CD-ROM No.FD-ABS-079. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Okita, K., and Kajishima, T.: "Three-Dimensional Computation of Unsteady Cavitating Flow in a Cascade"9th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Honolulu. CD-ROM No.FD-ABS-076. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tomoyuki,Deguchi, Yutaka,Miyake and Kouhei,Okita: "A Numerical Simulation of Rotating Stall in Axial Flow Fans"Trans. JEME (Ser.B). (submitted to). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kouhei,Okita and Takeo,Kajishima: "Numerical Simulation of Unsteady Cavitating Flow around a Hydrofoil"Trans. JEME (Ser.B). 68-667 (to appear in). (2002)

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

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Published: 2003-09-17  

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