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Influence of vortex street structure on the efficiency of energy separation

机译：涡街结构对能量分离效率的影响

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摘要

Regions with reduced and increased values of total enthalpy are observed in a time-averaged flow behind a bluff body. This energy redistribution takes place both in the vortex formation region and in the developed vortex wake. The present paper focuses on studying the effect of the structure of a vortex street on the intensity of energy redistribution. Two approaches are used. The first one is direct numerical simulation of the flow behind a transversely oscillating cylinder, which is known for a variety of vortex patterns in the wake. The simulations are based on a finite element solution of the Navier-Stokes equations for a compressible perfect viscous gas. The second approach is based on simplified point vortex models for infinite periodic vortex streets, which contain a finite number of vortex chains in equilibrium. It turns out that these simple models make it possible to obtain satisfactory qualitative results, particularly if a more precise approximation of velocity fields in the vortex cores (Rankine vortices) is implemented. It is shown that the effect of energy redistribution significantly depends on the vortex structure, namely the mutual arrangement of the vortices and their intensities. The estimates of the energy separation efficiency in the time-averaged flow are obtained for the general case of an arbitrary number of chains. A more detailed analysis is performed for vortex streets with 2,3, and 4 vortex chains. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在虚张声势体后面的时间平均流中观察到总焓值减小和增大的区域。这种能量重新分布既发生在涡旋形成区域中，也发生在涡旋尾流中。本文的重点是研究涡街结构对能量重新分布强度的影响。使用两种方法。第一个是对横向振荡圆柱体后方流动的直接数值模拟，这在尾流中因各种涡流模式而闻名。该模拟基于Navier-Stokes方程的可压缩理想粘性气体的有限元解。第二种方法基于无限周期涡街的简化点涡模型，该均衡涡中包含有限数量的涡链。事实证明，这些简单的模型使获得令人满意的定性结果成为可能，特别是如果在涡旋核（朗肯涡旋）中采用更精确的速度场近似。结果表明，能量的重新分配效果很大程度上取决于涡旋结构，即涡旋的相互排列及其强度。对于任意数目的链的一般情况，将获得时间平均流中能量分离效率的估计值。对具有2、3和4个涡旋链的涡旋街进行了更详细的分析。 （C）2019 Elsevier Ltd.保留所有权利。

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