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Establishment of wind tunnel experimental methods to evaluation of fluid phenomena and aerodynamic noise

Research Project

Project/Area Number 21K14302
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 23020:Architectural environment and building equipment-related
Research InstitutionOsaka University

Principal Investigator

Kobayashi Noriaki  大阪大学, 大学院工学研究科, 技術職員 (60880656)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords流体工学 / 空力騒音 / 風洞実験 / 流体計測 / 可視化
Outline of Research at the Start

空力騒音は風切り音ともよばれ,自動車のドアミラー,新幹線のパンタグラフ,航空機の主翼・主脚などの輸送機械や空調機器のファン,風車翼などの流体機械から発生する,空気の流れに起因する騒音で,工学的に重要な問題となっている.
空力騒音は流れ場や物体周りを通過する渦の変形に伴い生じる現象であり,空力騒音の低減や発生メカニズムを明らかにするためには,その要因となる流体現象を詳細に調べることが極めて重要である.
本研究は空力音源と音場の可視化を行うことを主とした実験計測を行い,流れ場と音場を同時に評価できる新たな風洞実験手法の確立を目指す.

Outline of Final Research Achievements

The purpose of this study is to establish a new wind tunnel experimental method capable of evaluating flow and sound fields, and measurements are taken of the flow field using stereo PIV and the sound field using a precision sound level meter. A system is also constructed to measure the fluid forces acting on objects. The main subjects are bluff objects such as cylinders and rectangular prisms, which are known to have a prominent effect on certain frequencies due to the shedding frequency of vortices. By using this method and measurement system, we are able to evaluate the basic performance of the wind tunnel and evaluate the spectrum and directionality of aerodynamic noise generated from cylinders and rectangular prisms. We are also able to measure the fluid forces acting on the object in terms of the 3 forces and 3 moments acting on each axis of the object.

Academic Significance and Societal Importance of the Research Achievements

室内における快適さを妨げる要因の一つに空力騒音があげられ,工学的に重要な問題となっている.空力騒音は空気の流れに起因する騒音で,流れ場や物体周りを通過する渦の変形に伴い生じる現象であり,空力騒音の低減や発生メカニズムを明らかにするためには,その要因となる流体現象を詳細に調べることが極めて重要である.本研究は,流れ場と音場を評価できる新たな風洞実験手法の確立を目的とし,各種計測手法の実証を行った.さらに,本研究によって構築した風洞実験システムは,本研究のみならず本学風洞装置を利用する複数の利用者にも提供され,他の実験にも貢献することができた.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (4 results)

All 2024 2023 2022

All Presentation (4 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] 風洞実験用計測システムの構築2024

    • Author(s)
      小林典彰
    • Organizer
      九州地区総合技術研究会2024 in 大分大学
    • Related Report
      2023 Annual Research Report
  • [Presentation] 流体計測システムの開発と利活用2024

    • Author(s)
      小林典彰
    • Organizer
      2023年度高エネルギー加速器研究機構技術研究会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 流体計測システムの開発と高度化~風洞実験による多点同時計測~2023

    • Author(s)
      小林典彰
    • Organizer
      2023年度機器・分析技術研究会
    • Related Report
      2023 Annual Research Report
  • [Presentation] A STUDY OF AERODYNAMIC SOUND GENERATED FROM AN AIRFOIL SUBJECTED TO CIRCULAR-CYLINDER2022

    • Author(s)
      Noriaki Kobayashi, Yasumasa Suzuki, Chisachi Kato
    • Organizer
      The 7th International Conference on  Jets,Wakes and Separated Flows 2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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