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首页> 外文期刊>The Aeronautical Journal >Experimental and numerical investigation of confined unsteady supersonic flow over cavities
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Experimental and numerical investigation of confined unsteady supersonic flow over cavities

机译：腔内非定常超音速流动的实验和数值研究

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Experimental investigations were carried out to study the acoustic radiation from a rectangular wall mounted cavity in a confined supersonic flow. The free-stream Mach number was maintained at 1.5 and the cavity length-to-depth ratio was varied from 0.43 to 5.0. Acoustic measurements made on the top wall show jumps in the dominant frequency as the cavity behaviour changes from shallow-to-square-to-deep cavity. Numerical simulations of this unsteady two-dimensional flow using the commercially available software FLUENT have also been carried out. Unsteady pressure data at the same location in the flow field as the pressure transducers in the experiments was collected. FFT analysis of the unsteady pressure data was performed to obtain the dominant acoustic frequencies. The values for these dominant frequencies predicted by the numerical calculations agree well with experimental data. The numerical study also predicts the frequency jump observed in experiments.
机译：进行了实验研究，以研究在狭窄的超音速流中来自矩形壁挂式腔体的声辐射。自由流马赫数保持在1.5，腔长深比从0.43变化到5.0。在顶壁上进行的声学测量显示，随着腔体行为从浅到方到深腔的变化，主频跃变。还已经使用市售软件FLUENT对该不稳定二维流动进行了数值模拟。收集了流场中与实验中压力传感器相同位置的非稳态压力数据。对非稳态压力数据进行FFT分析以获得主导声频。通过数值计算预测的这些主频的值与实验数据非常吻合。数值研究还预测了实验中观察到的频率跃变。

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