Effect of mean-flow evolution on sound propagation through non-uniform jet flows
Effect of mean-flow evolution on sound propagation through non-uniform jet flows
复制标题
平均流演化对非均匀射流声音传播的影响
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
A. Dowling
中科院分区：
文献类型：
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作者：
S. Karabasov;T. Hynes;A. Dowling
研究了喷嘴和射流对声传播的影响。为了模拟非均匀三维轴对称平均流中的声传播，在频域中求解了伴随绿色函数问题，平均流场由RANS计算确定。我们开始讨论如何不断变化的平均流量和喷嘴的几何形状影响的声音从基本四极源，比较这些结果与通过求解一个简单的瑞利方程的平行平均流量。湍流射流的噪声建模的影响进行了讨论，并给出了两个电流源模型的声学类比的结果。
ठ** The effects of a nozzle and an evolving jet on sound propagation are studied. To model the sound propagation through non-uniform 3D axi-symmetric mean flows an adjoint Green function problem is solved in the frequency domain with mean-flow fields determined by a RANS calculation. We begin by discussing how an evolving mean flow and nozzle geometry affect the sound from elementary quadrupole sources, comparing these results with those obtained by solving a simpler Rayleigh-like equation for a parallel mean flow. The implications for modelling the noise of turbulent jets are discussed and results given for two current source models in an acoustic analogy.