The Prediction of Broadband Shock-Associated Noise Using RANS CFD
The Prediction of Broadband Shock-Associated Noise Using RANS CFD
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DOI：
10.2514/6.2009-3315
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发表时间：
2009-05
期刊：
影响因子：
--
通讯作者：
P. Morris;Steven A. E. Miller
中科院分区：
文献类型：
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作者：
P. Morris;Steven A. E. Miller
宽带激波相关噪声是超音速喷流在ff设计过程中产生的喷流噪声的一个组成部分。它具有多个宽带峰的特点，并在与射流下游轴线成大角度时占主导地位。介绍了一种利用雷诺平均N-S方程的解来预测宽带激波相关噪声的新模型。噪声模型是基于线性化欧拉方程的声学类比。当量源项取决于与射流激波胞体结构有关的fl函数和射流剪切层中的湍流速度fl函数的乘积。前者是确定性的，由RANS解得到。引入了一个统计模型来描述湍流特性。只需要知道喷嘴的几何形状和运行条件，就可以进行噪声预测。这克服了以前BBSAN模型中存在的局限性和经验主义。将不同轴对称喷管和不同工况下的计算结果与实验数据进行了对比，验证了模型的正确性。
Broadband shock-associated noise (BBSAN) is a component of jet noise generated by supersonic jets operating off-design. It is characterized by multiple broad band peaks and dominates the total noise at large angles to the jet downstream axis. A new model is introduced for the prediction of broadband shock-associated noise that uses the solution of the Reynolds averaged Navier-Stokes equations. The noise model is an acoustic analogy based on the linearized Euler equations. The equivalent source terms depend on the product of the fluctuations associated with the jet’s shock cell structure and the turbulent velocity fluctuations in the jet shear layer. The former are deterministic and are obtained from the RANS solution. A statistical model is introduced to describe the properties of the turbulence. Only the geometry and operating conditions of the nozzle need to be known to make noise predictions. This overcomes the limitations and empiricism present in previous BBSAN models. Results for various axisymmetric nozzles and operating conditions are compared with experimental data to validate the model.