A physical model of asymmetric vorti

A physical model of asymmetric vortices flow structure in regular state over slender body at high angle of attack

In subcritical Reyolds number flow region, the repeatable and determinate asymmetric vortices flow at regular state can be obtained by manually setting mini-perturbation on the nose of a pointed ogive-cylinder model at high angle of attack and zero side slip. Test results of this study involve surface pressure distributions, sectional-side-force distributions and flow visualizations. The analyses of these results revealed a complicated multi-vortices system at regular state in which asymmetric twin vortices with inception region and fully developed region, asymmetric triple vortices, four vortices region, five vortices region and Karman-vortex-street-like flow region are developed along the slender body. The correlation between multi-vortices system structures and corresponding sectional-side-force distribution is given. The behaviors of multi-vortices flow structure at the peculiar points of sectional-side-force distributions and characteristics of corresponding pressure distribution are analysed. Finally, a physical model of asymmetric multi-vortices flow structure in regular state over slender body is developed.

作 者： 邓学蓥 王刚 陈学锐 王延奎 刘沛清 郗忠祥   作者单位： 邓学蓥,王刚,陈学锐,王延奎,刘沛清(Institute of Fluid Mechanics, Beijing University of Aeronautics and Astronautics, Beijing 100083, China)

郗忠祥(Airfoil Research Center, Northwest Polytechnic University, Xi'an 710072,China) 

刊 名： 中国科学E辑(英文版)  SCI 英文刊名： SCIENCE IN CHINA (TECHNOLOGICAL SCIENCES)  年，卷(期)： 2003 46(6)  分类号： V21  关键词： slender body   high angle of attack   aerodynamics   asymmetric vortex flow   bistable flow  

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