| 圆柱尾流中的二次分离及环量衰减问题 |
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| 引用本文： | 凌国灿.圆柱尾流中的二次分离及环量衰减问题[J].空气动力学学报,1988(1). |
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| 作者姓名： | 凌国灿 |
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| 作者单位： | 中国科学院力学研究所 |
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| 摘 要： | 在圆柱绕流的非定常流动中,相应于旋涡的周期性脱落柱后的二次分离是周期性间断发生。二次涡的影响不能忽略。但对长时间流动的模拟还必须考虑尾涡的环量衰减。模拟Bluff Body流动有效的离散涡模型应包括二次分离及尾涡衰减两种机因。本文数值计算结果证明了上述结论。
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| 关 键 词： | 尾流 旋涡脱落 分离流 |
ON THE SECONDARY SEPARATION AND THE REDUCTION OF CIRCULATION IN THE WAKE FLOW BEHIND A CIRCULAR CYLINDER |
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| Ling Guocan.ON THE SECONDARY SEPARATION AND THE REDUCTION OF CIRCULATION IN THE WAKE FLOW BEHIND A CIRCULAR CYLINDER[J].Acta Aerodynamica Sinica,1988(1). |
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| Authors: | Ling Guocan |
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| Abstract: | Present work has shown that in the wake flow behind a circular cylinder corresponding io the vortex shedding the secondary separation on the rear surface occurs periodically rather than continuously.The secondary vortex does have an effect on the prediction of main flow characteristics.However,in order to match the numerical results to experiments,the reduction of circulation of vortices in the wake flow should be taken into account.For simulating the bluff body flow an effective discrete vortex model is presented in which both mechanism,i.e.the secondary separation and the reduction of circulation are incorporated. |
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| Keywords: | wakes vortex shedding separated flow |
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