Numerical Investigations on Tollmien–Schlichting Wave Attenuation Using Plasma-Actuator Vortex Generators
Numerical Investigations on Tollmien–Schlichting Wave Attenuation Using Plasma-Actuator Vortex Generators
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DOI：
10.2514/1.j056779
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发表时间：
2018-01
期刊：
影响因子：
2.5
通讯作者：
P. C. Dörr;M. Kloker
中科院分区：
文献类型：
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作者：
P. C. Dörr;M. Kloker
最近，等离子体激励器已被用来控制层流到湍流的转变在Blasius流的激励反向旋转的纵向涡。由于由此产生的动量重新分布，涡流产生了具有高流向速度和低流向速度区域的气流的展向调制，这通常被表示为条纹。在中等振幅的情况下，条纹通过减少Tollmien-Schlichting波的放大而产生流动的稳定，从而延迟过渡。在目前的工作中，两个根本上不同的致动器设置进行了研究：一个对称的，激发反向旋转的涡流;和一个非对称的，激发共转涡流。这些设置之间的差异进行了详细讨论，并审查各自的稳定流。
Recently, plasma actuators have been employed to control laminar-to-turbulent transition in Blasius flow by exciting counter-rotating longitudinal vortices. Due to the resulting momentum redistribution, the vortices generate a spanwise modulation of the flow with regions of high and low streamwise velocity, which are commonly denoted as streaks. In the case of moderate amplitudes, the streaks yield a stabilization of the flow by reducing the amplification of Tollmien–Schlichting waves, and hence delayed transition. In the present work, two fundamentally different actuator setups are investigated: a symmetrical one, exciting counter-rotating vortices; and a nonsymmetrical one, exciting corotating vortices. The differences between these setups are discussed in detail, and the respective stabilization of the flow is scrutinized.