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Vortex structure model in the turbulent boundary layr interacted with longitudinal vortex arrays (1996)

Research Project

Project/Area Number 07650208
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionYamaguchi University

Principal Investigator

OSAKA Hideo  Yamaguchi Uiv., Dept.of Engineering, Professor, 工学部, 教授 (90024611)

Co-Investigator(Kenkyū-buntansha) MOCHIZUKI Shinsuke  Yamaguchi Univ., Dept.of Engineering, Associate Professor, 工学部, 助教授 (70190957)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1996: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1995: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsTurbulent boundary layr / Longitudinal vortex arrays / Vortex structure / Secondary flows / Intermittency factor / Vorticity transport equation / 安定性 / スパン方向周期 / 渦構造 / 検査体積積分 / スパン方向変化
Research Abstract

The interaction between a turbulent boundary layr and longitudinal vortex arrays introduced in the free stream has been investigated experimentally in order to clarify the effect of this interaction on the structure of the vortices and the boundary layr, respectivly. The spanwise periodic longitudinal vortex arrays are artificially generated in a free stream. One of the parameters, spanwise periodicity of longitudinal vortices L/S (L denotes the spanwise distance between neighboring airfoils, S the airfoil span), rules both magnitude an streamwise path of secondary vortices caused within the turbulent boundary layr. Intermittency factor profiles revealed the effect of pairs of counterrotating secondary flows which showed the downwash flow for the midspan of the airfoil, and conversely, the upwash flow for the center slice of neighboring airfoils. Intermittency factors are strongly affected by the spacing between neighboring airfoils. The value of the intermittency factor decreases in t … More he inner layr with increasing L/S at the midspan of the airfoil. The estimation of the longitudinal component of vorticity vector brings new information about the longitudinal vortex characteristics, like path and strength. A further analysis of the other two remaining components of vorticity vector confirm the fact that, in the case of L/S<1, the vortices interact with each other leading to an abrupt loss of vortex strength but the interaction with the boundary is very weak. On the other hand, in the case of L/S*1, the vortex axis changing occurs. The next stage considered was the vorticity transport equation integrated over a control volume in order to find the vorticity flux. The control volume has been chosen so that at any streamwise location only one vortex should be found inside. The small spanwise period leads to high variations of the vorticity flux. The large spanwise period, on the other hand, leads to a steadily decreasing vorticity flux except for a slight variation that is produced by the effect of the vortices axis changing at the rebounding points. Less

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Hideo OSAKA Chiharu FUKUSHIMA: "Spanwise Variation of Turbuleint Flowfield for the Turbuleint Boundary Layer Interacting with Controlled Longitudinal varter Arrago" JSME International Journal,Ser,B. 39・1. 10-18 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hideo OSAKA Chiharu FUKUSHIMA: "Variation of skin frictche far a turbuleint bourdary layer interacting Loigh the controlled longitudinal vortex arrago" Emerging Techniques in Drag Reduction (Mechenical Engineering Publication Limited). 243-261 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 大坂英雄,Gabriela NEDELCU,岡下友則,福島千晴: "主流中から導入された縦渦列と干渉した乱流境界層の間欠領域の構造" 日本機械学会論文集(B). 62・602. 3533-3540 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 大坂英雄,Cabriela NEDELCU: "縦渦列と干渉した乱流境界層の構造(縦渦列の性質と渦度分布)" 日本機械学会論文集(B). 63・605. 32-39 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hideo OSAKA,Chiharu FUKUSHIMA: "Spatial Vriation of Turbulent Flow Field for the Turbulent Boundary Layr Interacting with Controlled Longitudinal Vortex Arrays" JSME International J.Ser.B. 39-1. 10-18 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hideo OSAKA,Chiharu FUKUSHIMA: "Variation of skin friction for a turbulent boundary layr Interacting with the cntrolled longitudinal vortex arrays" Emerging Techniques in Drag Reduction Mechanical Engineering Publications Limited. 234-261 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hideo OSAKA,Gabriela NEDELCU: "Tomonori OKASHITA,Chiharu FUKUSHIMA Turbulent Structure of an Intermittent Region of a Turbulent Boundary Layr Interacting with Controlled Longitudinal Vortex Arrays in a Free Stream" Trans.JSME,Ser.B. 63-602. 3533-3540 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hideo OSAKA,Gabriela NEDELCU: "Structure of a Turbulent Boundary Layr Interacting with Longitudinal Vortex Arrays (Feature o Longitudinal Vortex and Vorticity Profiles)" Trans.JSME,Ser.B. 63-605. 32-39 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 大坂英雄,Gabriela NEDELCU,岡下友則,稲葉千晴: "主流中から導入された縦渦列と干渉した乱流境界層の間欠領域の構造" 日本機械学会論文集(B). 62・602. 3533-3540 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 大坂英雄,Gabriela NEDELCU: "縦渦列と干渉した乱流境界層の構造(縦渦列の性質と渦度分布)" 日本機械学会論文集(B). 63・605. 32-39 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 大坂英雄,岡下友則,ネデルク・ガブリエラ: "主流中の縦渦列と干渉した乱流境界層のスパン方向変化に関する研究" 第27回乱流シンポジウム講演論文集. 14. 279-282 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 大坂英雄・ネデルク・ガブリエラ: 日本機械学会山口地方講演会講演論文集. 955-2. 139-140 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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