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Other TitleMeasurement of aerodynamics forces exerted on baseballs by a high-speed video camera
Author(jpn)丸山 純; 横山 佳之; 宮嵜 武; 姫野 龍太郎
Author(eng)Maruyama, Jun; Yokoyama, Yoshiyuki; Miyazaki, Takeshi; Himeno, Ryutaro
Author Affiliation(jpn)電気通信大学; 電気通信大学; 電気通信大学; 理化学研究所 情報基盤センター
Author Affiliation(eng)University of Electro-Communications; University of Electro-Communications; University of Electro-Communications; Institute of Physical and Chemical Research Advanced Computing and Communication Center
Issue Date2007-12-28
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication title境界層遷移の解明と制御研究会講演論文集 第39回
Proceedings of the 39th JAXA Workshops on Investigation and Control of Boundary-Layer Transition
Start page27
End page30
Publication date2007-12-28
AbstractUsing 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.
DescriptionJAXA Special Publication
Keywordsaerodynamic force; hard baseball; rotating sphere; spin; Reynolds number; high speed camera; aerodynamic characteristic; aerodynamic drag; drag measurement; 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
Document TypeConference Paper
JAXA Category特別資料
Report NoJAXA-SP-07-009

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