A vortex-dipole sheet model for a wake

A vortex-dipole sheet model for a wake
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尾流的涡旋偶极子片模型

DOI:
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发表时间:
1989
期刊:
影响因子:
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通讯作者:
R. Krasny
R. Krasny
中科院分区:
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文献类型:
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作者:
R. Krasny

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提出了一种具有尾流分量的自由剪切层涡模型。该层由一条同时支持涡旋片和涡旋偶极子片的曲线表示。涡旋片产生了一个单调的速度剖面,连接了剪切层两侧的外部流动。涡旋偶极子片捕捉到了尾迹中由于分离点上游边界层而产生的相反涡度效应。给出了控制涡旋偶极子片的方程,并给出了自由正弦尾迹的时间不稳定性计算,显示了涡旋街的发展。
A vortex model for a free shear layer with a wake component is proposed. The layer is represented by a curve which supports both a vortex sheet and a vortex‐dipole sheet. The vortex sheet yields a monotonic velocity profile that connects the outer flows on either side of the shear layer. The vortex‐dipole sheet captures the effect of oppositely signed vorticity that is present in the wake due to boundary layers upstream from the separation point. The equations governing a vortex‐dipole sheet are given and a temporal instability calculation for a free sinusoidal wake shows the development of a vortex street.