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Vortex structure in a periodically perturbed turbulent separated shear layer

机译:在定期扰动的湍流分离剪切层中的涡旋结构

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The vortex structure in the periodically perturbed turbulent separated shear layer is experimentally investigated. The backward-facing step flow is chosen for the test case, where the perturbation has been introduced as a direct suction and injection at the step edge. In this study, the particle imaging velocimeter (PIV) has been applied to measure the flow field. The data processing has been performed by means of the phase-averaging, synchronized with the perturbation, so that the periodic motion associated with the perturbation is extracted. It is discovered that the large-scale vortices are introduced by the perturbation and these vortices are convected downstream successively. It is also revealed that these vortices have a major role on the increasing of Reynolds stress in the separated shear layer enabling in the enhancement of the momentum transfer that promotes reattachment.
机译:经过实验研究了周期性地扰动湍流分离的剪切层中的涡旋结构。 选择落后的步骤流程用于测试壳体,其中扰动被引入阶梯边缘处的直接抽吸和喷射。 在该研究中,已经施加了颗粒成像速度计(PIV)以测量流场。 通过与扰动同步的相位平均来执行数据处理,从而提取与扰动相关联的周期性运动。 发现大规模涡旋由扰动引入,并且这些涡流连续地对象下游。 还透露,这些涡流对分离的剪切层中的雷诺应力的增加具有重要作用,使得能够提高促进重新附着的动量转移。

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