硬式野球ボールに働く流体力の測定

• 丸山, 純

• 横山, 佳之

• 宮嵜, 武

• 姫野, 龍太郎

• Maruyama, Jun

• Yokoyama, Yoshiyuki

• Miyazaki, Takeshi

• Himeno, Ryutaro

Bibliographic Information

Other Title

• Measurement of aerodynamics forces exerted on baseballs by a high-speed video camera

Abstract

Using a high-speed video camera, we have recorded the trajectory and the rotation of a hard baseball and a sphere thrown by pitching machines. We measured the drag and lift coefficients by analyzing the video images. We altered pitching machines on the market in order to throw a 'gyro-ball', whose rotational axis lies almost in the translational direction. The drag coefficient of a gyro-ball decreases with the Reynolds numbers (Re). For a fast-ball, the drag coefficient doesn't depend on Re and the lift coefficient is increases with the Re and the Spin Parameter (SP). The drag coefficient of a sphere is larger than that of a baseball for fast- and gyro-pitches, indicating that seams on the ball surface have substantial influence on the flow field.

資料番号: AA0063608009

レポート番号: JAXA-SP-07-009

Journal

• 宇宙航空研究開発機構特別資料: 境界層遷移の解明と制御研究会講演論文集　第39回 = JAXA Special Publication: Proceedings of the 39th JAXA Workshops on Investigation and Control of Boundary-Layer Transition

  宇宙航空研究開発機構特別資料: 境界層遷移の解明と制御研究会講演論文集　第39回 = JAXA Special Publication: Proceedings of the 39th JAXA Workshops on Investigation and Control of Boundary-Layer Transition JAXA-SP-07-009 27-30, 2007-12-28

  宇宙航空研究開発機構

Keywords

• 流体力
• 硬式野球ボール
• 回転球
• スピン
• レイノルズ数
• 高速度カメラ
• 空力特性
• 空力抵抗
• 抗力測定
• aerodynamic force
• hard baseball
• rotating sphere
• spin
• Reynolds number
• high speed camera
• aerodynamic characteristic
• aerodynamic drag
• drag measurement

Details

• CRID: 1050855511215956224
• NII Article ID: 120006829079
• NII Book ID: AA11984031
• ISSN: 1349113X
• Web Site: http://id.nii.ac.jp/1696/00005648/
• Text Lang: ja
• Article Type: conference paper
• Data Source:
  • IRDB
  • CiNii Articles