Comparison of RANS-based methods for the prediction of noise emitted by subsonic turbulent jets
Comparison of RANS-based methods for the prediction of noise emitted by subsonic turbulent jets
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基于 RANS 的亚音速湍流射流噪声预测方法的比较
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
C. I. D. Silva
中科院分区：
文献类型：
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作者：
V. Rosa;C. Deschamps;J. Salazar;C. I. D. Silva
本文对四种基于RANS的喷气噪声预测方法进行了比较。我们的目的是评估从两个数学框架派生的方法之间的差异：莱特希尔方程和线性化的欧拉方程。数值模拟结果表明：(A)马赫数为0.5~1.0、温度比为1.0和2.0的单流射流；(B)马赫数为0.9、温度比为0.86的人字形喷嘴作用下的单流射流。使用k-e湍流模型，从RANS CFD模拟中收集了关于湍流源统计特性的必要信息。显示了观察者在90◦处相对于喷流轴的声压级曲线图。用实验数据证实了数值预测的正确性。基于这两个数学框架的预测与实验结果吻合较好，但基于莱特希尔方程的预测方法公式更简单，对经验系数的依赖较少。
In this paper a comparison between four RANS-based jet noise prediction methods is conducted. We aim to evaluate the differences between methods derived from two mathematical frameworks: the Lighthill equation and the linearized Euler equations. A numerical investigation is shown for different geometries and jet operating conditions: (a) single stream jets with Mach number ranging from 0.5 to 1.0 and temperature ratio of 1.0 and 2.0; (b) single stream jets with the effect of a chevron nozzle at Mach number of 0.9 and temperature ratio of 0.86. The necessary information concerning the statistical properties of the turbulent sources was gathered from a RANS CFD simulation using a k–e turbulence model. Sound pressure level plots are shown for an observer at 90◦ related to the jet axis. Experimental data are used to corroborate the numerical predictions. Predictions based on both mathematical frameworks showed good agreement with experiments, however, methods based on the Lighthill equation present a simpler formulation and rely on less empirical coefficients.