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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >An experimental investigation of a large-scale structure of a two-dimensional backward-facing step by using advanced multi-point LDV
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An experimental investigation of a large-scale structure of a two-dimensional backward-facing step by using advanced multi-point LDV

机译：使用高级多点LDV的二维后向台阶的大规模结构的实验研究

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Measurements of spatio-temporal velocity fields at the separated shear layer and reattachment region of a two-dimensional backward-facing step flow are carried out simultaneously using a multi-point LDV. The objective of this paper is to clarify experimentally the structure of a large-scale structure of this flow field using a space and time correlation and conditional average. From the results of the correlation of the velocity fluctuation, the moving path of the vortex shedding from the separated shear layer to the reattachment region exhibits two patterns which it moves to near the wall region or the middle of the step height at the reattachment region. Especially, it moves to near the wall region when it grows larger in the separated shear layer. Moreover, the turbulence concerned with reattachment phenomenon transports from the reattachment region to a separated shear layer by recirculation flow. According to these transports of turbulence, a model for large-scale fluctuation is proposed as a self-excitation motion. [References: 19]
机译：使用多点LDV同时测量分离的剪切层和二维后向步进流的重新连接区域处的时空速度场。本文的目的是通过使用时空相关性和条件平均值，以实验方式阐明该流场的大规模结构。从速度波动的相关性结果来看，涡旋从分离的剪切层脱落到重新附着区域的运动路径表现出两种模式，它移动到壁区域附近或在重新附着区域的台阶高度的中间。特别是，当它在分离的剪切层中变大时，它会移动到壁区域附近。此外，与再附接现象有关的湍流通过再循环流从再附接区域传输到分离的剪切层。根据这些湍流的运移，提出了一种大范围波动的模型作为自激运动。 [参考：19]

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