Computation of the noise of initially laminar jets using a statistical approach for the acoustic analogy: application and discussion
Computation of the noise of initially laminar jets using a statistical approach for the acoustic analogy: application and discussion
复制标题
使用声学类比统计方法计算初始层流射流的噪声：应用和讨论
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
T. Hynes
中科院分区：
文献类型：
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作者：
S. Karabasov;C. Bogey;T. Hynes
使用声学类比研究了两个初始层流射流内对应于不同流入条件的声源的细节，一个完全层流，另一个具有喷嘴边界层强迫。源统计数据产生的大涡模拟和一些相关的问题，这样做的实用性和频率和lengthscale范围内的有效性，可以预期从这样的模拟进行了探讨。各种源项的比较重要性证实了以前的研究结果，除了一个额外的长期。在有效的频率范围内，用声学类比法和以前进行的LES-ILEE操纵面方法进行的噪声预测之间存在合理的一致性。声学类比是用来确定的lengthscales有助于噪声在不同的辐射角的射流和它们位于射流。
The details of the sound sources within two initially laminar jets that correspond to different inflow conditions, one fully laminar and the other with nozzle boundary layer forcing, are studied using an acoustic analogy. The source statistics are generated from Large Eddy Simulations and some issues associated with the practicalities of doing this and the frequency and lengthscale ranges of validity that one can expect from such simulations are explored. The comparative importance of various source terms confirms the results of previous studies with the exception of one extra term. Reasonable agreemeent is found between noise predictions using the acoustic analogy with that of a previously-conducted LES-ILEE control surface method, over the frequency range of validity. The acoustic analogy is used to determine the lengthscales which contribute to noise at different radiated angles to the jet and where they are located in the jets.