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Experimental study on wake structure of a sphere in the low Reynolds number

Research Project

Project/Area Number 16K06065
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Fluid engineering
Research InstitutionTohoku University

Principal Investigator

Konishi Yasufumi  東北大学, 流体科学研究所, 学術研究員 (20552540)

Co-Investigator(Kenkyū-buntansha) 奥泉 寛之  東北大学, 流体科学研究所, 技術専門職員 (60647957)
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords球 / 抗力 / 磁力支持天秤 / 曳航 / 剥離 / 低レイノルズ数 / 不安定性 / 支持干渉 / 後流
Outline of Final Research Achievements

The wake of a sphere has a complex flow structure. In the experimental study, there always appears some interference from the support, such as sting, strut, and wires. In this study, this problem is solved by using the Magnetic Suspension and Balance System , which has ability to hold a model in the space with magnetic forces. And to perform the qualitative low speed flow, the system is towed and a stereo PIV measurement were conducted. The result is qualitatively agreed with the result of CFD which was conducted as verification.

Academic Significance and Societal Importance of the Research Achievements

二次元物体において円柱や角柱が鈍体の基本形状として扱われるように三次元物体においては、球が基本形状のひとつであり、理論の予測を検証するためには、球周りの流れ場を正確に求めることが求められている。また球は、卓球、野球、ゴルフなどに代表されるようにスポーツ競技においても利用されており、工学的な観点から飛翔体と見なしても重要であり、本成果で得られる結果は軌跡の精度向上、モデルデザインにおいて役立つものと考えられる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (7 results)

All 2018 2017 2016 Other

All Presentation (6 results) (of which Int'l Joint Research: 4 results) Remarks (1 results)

  • [Presentation] Introduction of 1-m MSBS in Tohoku University, new device for aerodynamics measurements of the sports tools2018

    • Author(s)
      H. Okuizumi , H. Nagaike, Y. Konishi, S. Obayashi
    • Organizer
      The 12th Conference of the International Sports Engineering Association
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Low Speed Towing Test Using 1-m Magnetic Suspension and Balance System2017

    • Author(s)
      S. Oyama , H. Nagaike, Y. Konishi, H. Sawada, H. Okuizumi, S. Obayashi
    • Organizer
      Fourteenth International Conference on Flow Dynamics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] The Measurement of Sphere Drag using 1-m MSBS2017

    • Author(s)
      H. Okuizumi , H. Sawada, Y. Konishi
    • Organizer
      Fourteenth International Conference on Flow Dynamics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 東北大学流体科学研究所1-m磁力支持天秤装置を用いた球の抵抗測定2017

    • Author(s)
      奥泉寛之、澤田秀夫、小西康郁、大野智之、高橋正嘉、太田福雄
    • Organizer
      機械学会東北支部 第52期総会・講演会
    • Place of Presentation
      東北大学青葉記念会館(宮城県仙台市)
    • Related Report
      2016 Research-status Report
  • [Presentation] 1m磁力支持天秤装置による円柱の細長比に関する空力特性の研究2017

    • Author(s)
      佐藤慶一郎、奥泉寛之、澤田秀夫、小西康郁、野々村拓、浅井圭介
    • Organizer
      日本航空宇宙学会北部支部創立30周年記念2017年講演会
    • Place of Presentation
      東北大学流体科学研究所(宮城県仙台市)
    • Related Report
      2016 Research-status Report
  • [Presentation] An Experimental Study on the Effect of Fineness Ratio on the Aerodynamic Drag of Cylindrical Bodies using a MSBS2016

    • Author(s)
      Keiichiro Sato, Hiroyuki Okuizumi, Yasufumi Konishi, Keisuke Asai, Hideo Sawada
    • Organizer
      Thirteenth International Conference on Flow Dynamics
    • Place of Presentation
      Sendai International Center (Miyagi, Japan)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Remarks]

    • URL

      http://www.ifs.tohoku.ac.jp/windtunnel/setubi/msbs.html

    • Related Report
      2016 Research-status Report

URL: 

Published: 2016-04-21   Modified: 2020-03-30  

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