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首页> 外文期刊>Journal of Fluid Science and Technology >LDV and PIV Measurements of the Organized Oscillations of Turbulent Flow over a Rectangular Cavity
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LDV and PIV Measurements of the Organized Oscillations of Turbulent Flow over a Rectangular Cavity

机译：LDV和PIV测量矩形腔上的紊流的振荡

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This paper presents results of an experimental study of the organized oscillation of incompressible turbulent flow over a rectangular cavity. Experiments were carried out to clarify the oscillation frequencies and the strength of shear layer-cavity trailing edge interaction. LDV and PIV measurements were made in a closed re-circulating water tunnel for rectangular cavities with L /D (L ; cavity length, D ; cavity depth) =2 and L /D =4. Measurements were also made for a backward facing step flow. Reynolds number based on momentum thickness was 8,300. LDV-measured velocity spectra reveal that self-sustained oscillations due to shear layer-trailing edge interaction are absent or very weak. At the upstream part of the cavity, dominant frequencies of the velocity fluctuations show little variation with L /D , and the frequencies are close to those of the shear layer instability. As the measuring point moves to the downstream, oscillation frequencies decrease and the peaks of the spectra become unclear. PIV-measured instantaneous flow fields show the existence of organized vortical structures in the cavity shear layer. From PIV images, frequencies of cavity oscillation are visually estimated and the results are compared to the LDV-measured velocity spectra.
机译：本文介绍了矩形腔上不可压缩湍流的有组织振荡的实验研究结果。进行实验以弄清振动频率和剪切层-空腔后缘相互作用的强度。 LDV和PIV的测量是在一个封闭的循环水隧道中对 L / D（ L;腔体长度， D;腔体深度）= 2和的矩形腔体进行的L / I D ＝ 4。还进行了朝后的步进流测量。基于动量厚度的雷诺数为8,300。用LDV测得的速度谱显示，由于剪切层与尾缘的相互作用而导致的自持振荡不存在或非常微弱。在空腔的上游，速度波动的主要频率随 L / D的变化很小，并且这些频率接近剪切层失稳的频率。随着测量点向下游移动，振荡频率降低，光谱的峰值变得不清楚。 PIV测量的瞬时流场表明，在腔体剪切层中存在有组织的涡旋结构。从PIV图像中，可以直观地估计腔体振荡的频率，并将结果与​​LDV测量的速度谱进行比较。

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