期刊
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
卷 110, 期 -, 页码 1-9出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jweia.2012.07.005
关键词
Magnus force; Negative Magnus effect; Rotating sphere; Boundary layer separation; Support system; Reynolds number; Spin parameter
资金
- Deutsche Forschungsgemeinschaft (DFG), Bonn
Aerodynamic force measurements and a flow field survey were carried out on a sphere rotating perpendicular to the flow direction in order to investigate the effect of the rotation on the flow parameters at Reynolds numbers in the range of 0.68 x 10(5) < Re-D < 5.07 x 10(5). Experiments were performed using a support system based on the classic approach of a rod driving the sphere. Additionally, an innovative rear sting support was developed where the sphere was split into two hemispheres that were driven by a motor inside them. The results show considerable changes of the mean force coefficients with Reynolds number Rep and spin parameter SP, which can be attributed to the altered boundary layer separation. These changes also lead to significant changes of size and orientation of the wake zones. A negative Magnus effect occurs in a wide range of Reynolds numbers Rep and spin parameters SP. (C) 2012 Elsevier Ltd. All rights reserved.
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