• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Study on the Prediction and Control of By-Pass Transition to Turbulence

Research Project

Project/Area Number 10650897
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Aerospace engineering
Research InstitutionTokyo Metropolitan Institute of Technology

Principal Investigator

MASAHITO Asai  Tokyo Metropolitan Institute of Technology, Department of Aerospace Engineering, Professor, 工学部, 教授 (00117988)

Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2000: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1999: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1998: ¥2,200,000 (Direct Cost: ¥2,200,000)
KeywordsBoundary Layer / Laminar-Turbulent Transition / Flow Instability / Vortices / Streaky Structure
Research Abstract

First the instability of a near-wall low-speed streak is examined experimentally. Symmetric varicose modes which develop into hairpin-shaped vortices are governed by the Kelvin-Helmholtz instability of inflectional velocity profiles in the normal-to-wall direction. Anti-symmetric sinuous modes due to the inflectional instability of the spanwise velocity distributions evolve into a train of quasi-streamwise vortices with vorticity of alternating sign. The streak meandering caused by the sinuous mode continues without disappearing over a few wavelengths even after the breakdown. It is also found that the anti-symmetric mode is more dangerous than the symmetric mode as the streak width becomes comparable with the shear layer thickness.
Next examined are disturbance developments in the relaminarization and retransition process of boundary layer. Low-frequency fluctuations, which are markedly suppressed near the wall during laminarization due to the boundary-layer suction, start to grow algebraically downstream of the trailing edge of the suction region, leading to the retransition to wall turbulence. The algebraic growth of near-wall low-frequency fluctuations in the retransition process is found to be due to appearance and meandering of near-wall low-speed streaks, which are responsible for the by-pass boundary-layer transition caused by high-intensity background turbulence.
In addition, the instability of compressible three-dimensional boundary layers at Mach numbers of 0.2 to 2.0 is examined theoretically. The boundary layer becomes unstable to stationary three-dimensional modes when the cross flow velocity exceeds a rather small threshold less than 1% of the external flow velocity. Importantly, the critical Reynolds number for stationary modes does not strongly depend on the Mach number.

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] Masahito ASAI: "Critical Condition for Lateral Turbulent Contamination in Blasius Flow"Memoirs of Tokyo Metropolitan Inst.Tech.. 12. 11-19 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masahito ASAI: "Experimental Investigation of the Receptivity of Separated Flow"Proceedings of Third International Conference on Fluid Mechanics, Beijing Inst.Tech.Press. 231-237 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 浅井雅人: "壁近傍ストリーク構造の不安定性"航空宇宙技術研究所特別資料. 43. 9-12 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] ASAI Masahito: "Influence of Compressibility on Three-Dimensional Boundary Layer Stability"Transactions of Japan Society for Aeronautical and Space Sciences. 42・136. 76-84 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] ASAI Masahito: "Experimental Investigation of the Receptivity of Flow Separating at a Convex Corner"Fluid Dynamics Research. 27. 117-128 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 浅井雅人: "壁近傍スオリーク構造の不安定性に関する実験的研究"京大数理解析研究所講究録. 1121. 71-76 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] ASAI Masahito: "Experimental Investigation of the Instability of Low-Speed Streak in a Boundary Layer"ICTAM 2000, Abstract Book. 113 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] ASAI Masahito: "Instability and Breakdown of the Three-Dimensional High-Shear Layer Associated with a Near-Wall Low-Speed Streak"Laminar-Turbulent Transition, Springer-Verlag. 269-274 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masahito ASAI: "Instability of Compressible Three-Dimensional Boundary Layers to Stationary Disturbances"Transactions of Japan Society for Aeronautical and Space Sciences. 43・142. 190-195 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masahito ASAI: "Development of Instability Modes of a Low-Speed Streak"Special Publication of NAL. 48. 71-74 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Asai: "Critical Condition for Lateral Turbulent Contamination in Blasius Flow"Memoirs of Tokyo Metropolitan Inst. Tech.. 12. 11-19 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Asai and M.Kaneko: "Experimental Investigation of the Receptivity of Separated Flow"Proc.3rd International Conference on Fluid Mechanics, Beijing Inst.Tech.Press. 231-237 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Asai, N.Saitoh, H.Seino and N.Itoh.: "Influence of Compressibility on Three-Dimensional Boundary Layer Stability"Transactions of Japan Society for Aeronautical and Space Sciences. 42. 76-84 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Asai and M.Minagawa: "Instability of Near-Wall Streak in Laminar Boundary Layer (in Japanese)"Special Publication of NAL. 43. 9-12 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Asai and M.Kaneko: "Experimental Investigation of the Receptivity of Flow Separating at a Convex Corner"Fluid Dynamics Research. 27. 117-128 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Asai and M.Minagawa: "Experimental Investigation of Instability of Near-Wall Streaky Structure (in Japanese)"Bull. Research Inst.Math.Sci.Kyoto Univ.. 1121. 71-76 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Asai, A.Fukuoka and M.Nishioka: "Experimental Investigation of the Instability of Low-Speed Streak in a Boundary Layer"ICTAM 2000, Abstract Book. 113. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Asai, M.Minagawa and M.Nishioka: "Instability and Breakdown of the Three-Dimensional High-Shear Layer Associated with a Near-Wall Low-Speed Streak"Laminar-Turbulent Transition, Springer-Verlag. 269-274 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Asai, N.Saitoh, H.Seino and N.Itoh: "Instability of Compressible Three-Dimensional Boundary Layers to Stationary Disturbances"Transactions of Japan Society for Aeronautical and Space Sciences. 43. 190-195 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] "Development of Instability Modes of a Low-Speed Streak"Special Publication of NAL. 48. 71-74 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] ASAI Masahito: "Experimental Investigation of the Instability of Low-Speed Streak in a Boundary Layer"ICTAM 2000, Abstract Book. 113 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] ASAI Masahito: "Instability and Breakdown of the Three-Dimensional High-Shear Layer Associated with a Near-Wall Low-Speed Streak"Laminar-Turbulent Transition, Springer-Verlag. 269-274 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 浅井雅人: "壁近傍ストリーク構造の不安定性に関する実験的研究"京大数理解析研究所講究録. 1121. 71-76 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] ASAI Masahito: "Instability of Compressible Three-Dimensional Boundary Layers to Stationary Disturbances"Transactions of Japan Society for Aeronautical and Space Sciences. 43・142. 190-195 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] ASAI Masahito: "Development of Instability Modes of a Low-Speed Streak"Special Publication on NAL. 48. 71-74 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] M.Asai: "Experimental investigation of receptivity of a shear layer separating at a convex corner"Fluid Dynamics Research. 26. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Asai: "Instability and breakdown of the three-dimensional high-shear layer associated with a near-wall low-speed streak"Laminar-Turbulent Transition, Springer. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 浅井 雅人: "乱流遷移機構と層流化"日本航空宇宙学会誌. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Masahito Asai: "Experimental Investigation of the Receptivity of Separated Flow" Proc.3rd International Conference on Fluid Mechanics. 231-237 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Masahito Asai: "Critical Condition for Wall Turbulence Generation in Blasius Flow" Memoirs of Tokyo Metropolitan Inst.Tech.12. 11-19 (1998)

    • Related Report
      1998 Annual Research Report

URL: 

Published: 1998-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi