| 关于卡门涡街形状稳定性的一点分析 |
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| 引用本文： | 董双岭,吴颂平.关于卡门涡街形状稳定性的一点分析[J].水动力学研究与进展(A辑),2009,24(3). |
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| 作者姓名： | 董双岭 吴颂平 |
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| 作者单位： | 北京航空航天大学航空科学与工程学院,北京,100083 |
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| 摘 要： | 在圆柱绕流的卡门涡街中,单个涡对于来流有相对速度,以该速度观察,其周围的流线更类似无旋理论中有环量的圆柱绕流.因此在势流解的基础上,运用扰动理论分析了涡街形状的稳定性问题.结果表明,涡位置的纵横比有一变化范围,以卡门的经典值为下限,与涡相对速度,实际涡核的大小及其环量都有关系,但与不构成单调的关系.与实验数据和数值模拟的结果进行对比,表明论文的分析是合理的.
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| 关 键 词： | 圆柱绕流 涡街 稳定性 扰动理论 环量 |
An analysis of the stability of Karman vortex street configurations |
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| DONG Shuang-ling,WU Song-ping.An analysis of the stability of Karman vortex street configurations[J].Journal of Hydrodynamics,2009,24(3). |
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| Authors: | DONG Shuang-ling WU Song-ping |
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| Affiliation: | School of Aeronautic Science and Engineering;Beijing University of Aeronautics and Astronautics;Beijing 100083;China |
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| Abstract: | Vortices in the Karman vortex street move relatively to the uniform flow. The relative stream line pattern about each vortex is similar to the flow around a circular cylinder with circulation. Based on complex potential solution of moving cylinders with circulation, the stability of Karman vortex street configurations is analyzed with perturbation theory in this paper. The result shows that the spacing ratio for vortex street varies within certain range but with the lowest limit 0.281 by Karman's result, an... |
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| Keywords: | flow aroud a circular cylinder vortex street stability pertubation theory circulation |
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