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Study on unsteady aerodynamic forces using a system of wind tunnels of which air streams can change speed and direction rapidly

Research Project

Project/Area Number 14350247
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 構造工学・地震工学
Research InstitutionNihon University

Principal Investigator

NOMURA Takashi  Nihon University, College of Science and Technology, Professor, 理工学部, 教授 (50126281)

Co-Investigator(Kenkyū-buntansha) KITAGAWA Tetsuya  Nagoya University, Associate Professor, エコトピア科学研究機構, 助教授 (10287584)
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥14,600,000 (Direct Cost: ¥14,600,000)
Fiscal Year 2004: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2003: ¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 2002: ¥7,700,000 (Direct Cost: ¥7,700,000)
KeywordsAC servo motor wind tunnels / unsteady wind / aerodynamic force / turbulent flow / square cylinder / wind direction / 風向変動気流 / 非定常空気力 / カルマンスペクトル / 変動気流 / モリソン公式
Research Abstract

The objectives of the present study are to develop a new wind tunnel system which can actively generate turbulent flows as well as flows of which speed and direction can change rapidly. The system consists of two wind tunnels of which fans are driven by AC servomotors controlled by computers Each wind tunnel has a square duct with 40cm x 40cm cross section and has a capacity to initiate 15 m/s speed stream only in 0.1 second. The two same wind tunnels are aligned on the floor as their air streams cross at the angle of 60 degrees. The resulting merged stream may acquire the features such as two horizontal turbulent fluctuation components, or time dependent speed and stream direction.
At various combinations of two steady speeds, the two wind tunnels are driven in order to measure the steady speed and direction of the resulting merged streams. Thus, the relations between the two wind speeds and the resulting speed and direction are established. From these relations, the histories of the control voltages to generate streams of time dependent speed and direction.
This facility and the control method are used to generate turbulent flows of which stream-wise fluctuation component and the lateral fluctuation component obey Karman spectra. As for the unsteady aerodynamics force measurement, a square cylinder is placed vertically in the merged streams. In streams with stepwise change of the flow speed, stronger drag forces and negative lift direction in comparison to the steady aerodynamic forces are observed. In streams with constant rate of direction change, it is observed that the aerodynamic forces at higher rate differs from the steady aerodynamic forces much more.

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (21 results)

All 2005 2004 2003 2002 Other

All Journal Article (14 results) Publications (7 results)

  • [Journal Article] 2方向の気流を合成して生成した変動気流の特性2005

    • Author(s)
      細田, 大畑, 窪田, 野村
    • Journal Title

      第32回土木学会関東支部技術研究発表会講演概要集 I

      Pages: 88-88

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 急な風速変動が物体に及ぼす力の測定2005

    • Author(s)
      関根, 田口, 島村, 野村
    • Journal Title

      第32回土木学会関東支部技術研究発表会講演概要集 I

      Pages: 89-89

    • Related Report
      2004 Annual Research Report
  • [Journal Article] ウェーブレット逆変換のアナロジーによるガスト応答波形の推定2004

    • Author(s)
      北川徹哉
    • Journal Title

      土木学会論文集 759/I-67

      Pages: 171-180

    • NAID

      120000975193

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] ガスト応答時刻歴のウェーブレットベース・シミュレーション2004

    • Author(s)
      北川徹哉
    • Journal Title

      第18回風工学シンポジウム論文集

      Pages: 389-394

    • NAID

      130004644255

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] A wavelet-based simulation on gust response2004

    • Author(s)
      T.Kitagawa
    • Journal Title

      Journal of Structural Mechanics and Earthquake Engineering, JSCE, No.759/I-67

      Pages: 171-180

    • NAID

      120000975193

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] A wavelet-based simulation on gust responses2004

    • Author(s)
      T.Kitagawa
    • Journal Title

      Proc. of 18th National Symposium on Wind Engineering

      Pages: 389-394

    • NAID

      120000975193

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 風速変動エネルギー回収の試み2004

    • Author(s)
      北川徹哉
    • Journal Title

      土木学会第59回年次学術講演会講演概要集 (CD-ROM)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 静止タンデム2円柱に作用する空気力に関するLES2004

    • Author(s)
      太田裕希, 北川徹哉
    • Journal Title

      土木学会第59回年次学術講演会講演概要集 (CD-ROM)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Aerodynamic forces on a square cylinder in oscillating flow with mean velocity2003

    • Author(s)
      T.Nomura, Y.Suzuki, M.Uemura, N.Kobayashi
    • Journal Title

      Journal of Wind Engineering and Industrial Aerodynamics 91

      Pages: 199-208

    • NAID

      10007252304

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] A wavelet-based method to generate artificial wind fluctuation data2003

    • Author(s)
      T.Kitagawa, T.Nomura
    • Journal Title

      Journal of Wind Engineering and Industrial Aerodynamics 91

      Pages: 943-964

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Aerodynamic forces on a square cylinder in oscillating flow with mean velocity2003

    • Author(s)
      T.Nomura, Y.Suzuki, M.Uemura, N.Kobayashi
    • Journal Title

      Journal of Wind Engineering and Industrial Aerodynamics Vol.91

      Pages: 199-208

    • NAID

      10007252304

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] A wavelet-based method to generate artificial wind fluctuation data2003

    • Author(s)
      T.Kitagawa, T.Nomura
    • Journal Title

      Journal of Wind Engineering and Industrial Aerodynamics Vol.91, No.7

      Pages: 943-964

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 風向が時間変化する気流による非定常空気力の測定2002

    • Author(s)
      野村卓史, 関野洋一郎, 鈴木洋司
    • Journal Title

      第17回風工学シンポジウム論文集

      Pages: 297-302

    • NAID

      80015790731

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Measurements of aerodynamic forces exerted by air flows of time-dependento direction2002

    • Author(s)
      T.Nomura, Y.Sekino, Y.Suzuki
    • Journal Title

      Proc. of 17th National Symposium on Wind Engineering

      Pages: 297-302

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] 野村卓史, 越智茜, 黒羽哲, 北川徹哉: "大型化したACサーボモータ風洞の変動気流特性"土木学会第58回年次学術講演会講演概要集. I. I-137 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 関野洋一郎, 野村卓史: "風速・風向が急変する気流の生成に関する工夫と作用空気力の特性"土木学会第58回年次学術講演会講演概要集. I. I-138 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Kitagawa, T.Nomura: "A wavelet-based method to generate artificial wind fluctuation data"Journal of Wind Engineering and Industrial Aerodynamics. Vol.91,No.7. 943-964 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 北川徹哉: "風速変動の時間・スケール特性を考慮したガスト応答推定法"土木学会第58回年次学術講演会講演概要集. I. (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 北川徹哉: "ウェーブレット逆変換のアナロジーによるガスト応答波形の推定"土木学会論文集. I(掲載決定). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 野村卓史, 関野洋一郎, 鈴木洋司: "風向が時間変化する気流による非定常空気力の測定"第17回風工学シンポジウム論文集. 297-302 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Nomura, Y.Suzuki, M.Uemura, N.Kobayashi: "Aerodynamic forces on a square cylinder in oscillating flow with mean velocity"Journal of Wind Engineering And Industrial Aerodynamics. 91. 199-208 (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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