Hydrodynamics and Sound Generation of Low Speed Planar Jet
Hydrodynamics and Sound Generation of Low Speed Planar Jet
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低速平面射流的流体动力学和声音产生
DOI：
10.1115/1.2844581
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Suponitsky V
中科院分区：
文献类型：
--
作者：
Suponitsky V
本文采用大涡模拟结合Lighthill声学类比的方法研究了低速平面射流的流体力学和声辐射特性。射流发展良好的（抛物线）和未开发的（顶帽）平均速度分布进行了模拟。结果表明：（i）对于从顶帽型廓线演化而来的射流，初始对称模态占主导地位，而对于从抛物线型廓线演化而来的射流，初始反对称模态占主导地位，导致势核的弯曲变形;（ii）平均速度廓线的形状对平均流动特性有一定的影响;然而，在波动的发展过程中观察到了主要的差异。速度波动显着更高的射流发展从一个抛物线轮廓在该地区以外的潜在核心的结束之前，流量达到自我保护的状态。为了计算基本声辐射，莱特希尔方程中的声源在所有方向上都被视为紧凑的，或者在展向方向上被视为非紧凑的。计算区域的展向长度被发现有一个小的影响所获得的结果与紧凑的所有方向的解决方案，只要展向长度超过相关长度。结果表明，大部分的声音产生的区域以外的潜在核心的结束。
Hydrodynamics and sound radiation of a low speed planar jet withhave been studied by large eddy simulation combined with Lighthill’s acoustic analogy. Jets evolving from both well-developed (parabolic) and undeveloped (top-hat) mean velocity profiles have been simulated. The results showed the following: (i) initial domination of a symmetrical mode for jets evolving from top-hat profiles and prevailing of an antisymmetrical mode resulting in a sinuous distortion of the potential core for jets evolving from parabolic profiles, and (ii) shape of a mean velocity profile has some effect on mean flow characteristics; however, the major differences were observed in the development of the fluctuations. Velocity fluctuations were significantly higher for jets evolving from a parabolic profile in the region beyond the end of the potential core before the flow reached a self-preserving state. To calculate the basic sound radiation, the sources in Lighthill’s equation were treated either as compact in all directions or as noncompact in the spanwise direction. The spanwise length of the computational domain was found to have a little effect on the results obtained with compact in all directions solution provided that spanwise length exceeds the correlation length. Results showed that the majority of sound was generated by the region beyond the end of the potential core.
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