| 圆柱绕流尾迹中涡的特征分析 |
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| 引用本文： | 董双岭,吴颂平.圆柱绕流尾迹中涡的特征分析[J].北京航空航天大学学报,2009,35(6):758-761. |
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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,北京,100191;北京航空航天大学航空科学与工程学院,北京,100191 |
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| 摘 要： | 在低雷诺数圆柱绕流中,卡门涡街中涡的形状随着其向下游的发展是不断变化的,而且它也不是理想轴对称的.针对该问题,利用有限元法进行数值模拟,研究了由涡量等值线表示的涡的形状特征.由流场中几种等值线的对比可以得到,主要是涡量等值线与压力等值线之间的差异造成了涡的形状变化.利用广义的茹柯夫斯基变换描述涡相对于轴对称的变形状态.结果表明,描述涡的主要3个参数随半径的变化规律不同,即椭圆率的抛物形分布,偏心率的线性分布和弯度的近似常量的分布.在此基础上给出了3个参数各自对应的运动学量表达式,两者对比的结果还是比较相符的.
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| 关 键 词： | 涡街 圆柱 非定常流 数学变换 |
| 收稿时间： | 2008-05-19 |
Characteristic analysis of the vortex in the flow past a circular cylinder |
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| Dong Shuangling,Wu Songping.Characteristic analysis of the vortex in the flow past a circular cylinder[J].Journal of Beijing University of Aeronautics and Astronautics,2009,35(6):758-761. |
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| Authors: | Dong Shuangling Wu Songping |
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| Institution: | School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China |
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| Abstract: | In low-Reynolds-number flow past circular cylinder,the shape of vortices in the vortex street is not ideally axisymmetric,and changes with the the flow downstream.To solve the problem,finite element method was used to simulate the flow and the character of the vortex shape was analyzed by vorticity contour.Through analysis of a few contours,the vorticity contour changes due to the difference between the vorticity contour and the pressure contour.Generalized Joukowski transformation was used to describe the ... |
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| Keywords: | vortex street circular cylinder unsteady flow mathematical transformations4 |
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