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Turbulent Model of Coherent Structures in a Transitional Boundary Layer

Research Project

Project/Area Number 13650178
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionToyohashi University of Technology

Principal Investigator

MAKITA Hideharu  Toyohashi University of Technology, Dept.of Engineering, Professor, 工学部, 教授 (40135413)

Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥2,600,000 (Direct Cost: ¥2,600,000)
KeywordsBoundary Layer / Transition / Turbulent Spots / Horseshoe Vortex / Turbulent Bulge / Flow Control / Flow Visualization / Conditional Measurement
Research Abstract

In order to experimentally study interaction phenomena between turbulent spots in a laminar boundary layer or horseshoe vortices in a turbulent boundary layer, a pair of turbulent spots or horseshoe vortices was artificially developed in each boundary layer. Then, a synthetic transitional boundary layer was generated by inducing many turbulent spots to clarify the effects of their interaction process on the structure of the boundary layer. To observe the vortex structure, coherent velocity and vorticity components were obtained trough conditional hot-wire measurement.
(1)The longitudinal vortex at each inside wingtip comes into contact, as the two spots begin to merge. Mutual interaction between them generates a strong upwash and give birth to a strong velocity-defect region in the upper merged region.
(2)The spanwise vortices constitute the heads of large-scale horseshoe vortices connecting the longitudinal vortices beneath and may grow into turbulent bulges in the downstream turbulent boundary layer. As the array of turbulent spots grows up into a turbulent boundary layer, its periodical structure survives still around the boundary layer's outer edge.
(3)The merged horseshoe vortices grew to be a single larger horseshoe vortex in the downstream region, when two horseshoe vortices were induced simultaneously.
(4)When the two horseshoe vortices were induced with time delay of 20msec, they are not connected with each other and apparently, their inside legs were not separated from each horseshoe vortex.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 蒔田 秀治他3名: "層流境界層中における乱流斑点の相互干渉に関する可視化実験"日本機械学会2001年度年次大会講演論文集. No.01-1. 211-212 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 蒔田 秀治他3名: "乱流境界層中における大規模馬蹄形渦の相互干渉に関する実験的研究"日本流体力学会誌「ながれ」. 21. 42-43 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 蒔田 秀治他3名: "乱流境界層内における大規模馬蹄形渦の相互干渉(干渉した馬蹄形渦の単独馬蹄形渦との渦構造の比較)"日本機械学会東海支部地区講演会講演論文集. No.023-2. 89-90 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 蒔田 秀治他3名: "乱流境界層中における馬蹄形渦の相互干渉(渦構造の変形とレイノルズ応力に関する考察)"航空宇宙技術研究所特別報告. SP. (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 蒔田 秀治他3名: "レイノルズ応力分布から見た乱流境界層内の馬秩序渦の相互干渉過程"日本機械学会流体工学部門講演会講演論文集. (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Makita et al.: "Visualization Experiment on Mutual Interaction between Turbulent Spots in a Laminar Boundary Layer"Proceedings of 2001 Meeting of Japan Society of Mechanical Engineering. No.01-1, Vol.II. 211-212 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Makita et al.: "An Experimental Study of Interaction between Two Horseshoe Vortices in a Turbulent Boundary Layer"Proceedings of 2002 Meeting of Japan Society of Fluid Mechanics. 21. 42-43 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Makita et al.: "Interaction between Two Horseshoe Vortices in a Turbulent Boundary Layer"Proceedings of Tokai Department Meeting of Japan Society of Mechanical Engineering. No.023-2. 89-90 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Makita et al.: "Mutual Interaction between Horseshoe Vortices in a Turbulent Boundary Layer"Special Publication of National Aerospace Laboratory SP. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Makita et al.: "Reynolds stress and Interaction of Horseshoe Vortices in a Turbulent Boundary Layer"Proceedings of Fluid Engineering Conference 2003 of Japan Society of Fluid Mechanics. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 蒔田秀治他3名: "層流境界層中における乱流斑点の相互干渉に関する可視化実験"日本機械学会2001年度年次大会講演論文集. No.01-1. 211-212 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] 蒔田秀治他3名: "乱流境界層中における大規模馬蹄渦の相互干渉に関する実験的研究"日本流体力学会誌「ながれ」. 21. 42-43 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 蒔田秀治他3名: "乱流境界層内における大規模馬蹄形渦の相互干渉(干渉した馬蹄形渦と単独馬蹄形渦との渦構造の比較)"日本機械学会東海支部地区講演会講演論文集. No.023-2. 89-90 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 蒔田秀治他3名: "乱流境界層中における馬蹄形渦の相互干渉(渦構造の変形とレイノルズ応力に関する考察)"航空宇宙技術研究所特別報告. SP. (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 蒔田秀治他3名: "レイノルズ応力分布から見た乱流境界層内の馬秩序渦の相互干渉過程"日本機械学会流体工学部門講演会講演論文集. (発表予定). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 蒔田 秀治・他3名: "層流境界層中における乱流斑点の相互干渉に関する可視化実験"日本機械学会2001年度年次大会講演論文集II. No.01-1. 211-212 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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