| 圆柱绕流尾迹流态特征和涡的演化过程分析 |
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| 引用本文： | 董双岭,吴颂平.圆柱绕流尾迹流态特征和涡的演化过程分析[J].北京航空航天大学学报,2009,35(8):933-937. |
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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： | 低雷诺数圆柱绕流中存在着复杂的流动过程,比如,尾迹中涡的发展显然不是理想的轴对称卷绕和扩散的过程.针对上述问题,用场观点和拉各朗日观点分别分析了固定时刻的流场特征和不同时刻的流动过程.首先通过等压线和相对流线的叠加,分析了相邻涡间通道内的流动.其次从涡结构的角度解释了尾迹中流体速度随时间的变化规律,并利用流体在不同时刻受不同流动结构控制的观点解释了染色线多次折回中粒子间的显著间断现象.最后对绕圆柱附近的流动进行了分区界定,分析了其中部分流体的变形情况和运动过程.
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| 关 键 词： | 圆柱 涡街 涡脱落 近尾迹 |
| 收稿时间： | 2008-06-30 |
Analysis of wake pattern and vortex evolution in flow past circular cylinder |
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| Dong Shuangling,Wu Songping.Analysis of wake pattern and vortex evolution in flow past circular cylinder[J].Journal of Beijing University of Aeronautics and Astronautics,2009,35(8):933-937. |
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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 passing circular cylinder,fluid experiences a relatively complex process,for instance,the vortex in the near wake does not roll up and diffuse axisymmetrically.Field and Lagrange viewpoint were used to analyze flow field characteristic at fixed time and flow process during a time interval separately.Through the superposition of pressure contours and relative streamline,alleyway flow between votices was analyzed.The time-dependent fluid velocities were interpreted from the viewpoi... |
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| Keywords: | circular cylinder vortex street vortex shedding near wake |
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