PREDICTION OF NOISE GENERATED BY A ROUND NOZZLE JET FLOW USING COMPUTATIONAL AEROACOUSTICS
PREDICTION OF NOISE GENERATED BY A ROUND NOZZLE JET FLOW USING COMPUTATIONAL AEROACOUSTICS
复制标题
使用计算空气声学预测圆形喷嘴射流产生的噪声
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
M. Y. Hussaini
中科院分区：
文献类型：
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作者：
A. Uzun;M. Y. Hussaini
本文介绍了计算空气声学在圆形喷管射流噪声预报中的应用。本文采用高精度、多块、大涡模拟(LES)程序，对喷管内部流动和喷管外部自由喷流同时进行了数值模拟。为了模拟喷流流场及其辐射噪声，我们在大约3.7亿个网格点上使用为计算空气声学开发的高保真数值格式求解控制方程。近场噪声到远场的投影是通过耦合大涡模拟数据和Ffowcs Williams-Hawking方法来实现的。这些模拟的主要重点是计算足够详细的射流，以准确地捕捉导致噪声产生的物理过程。在喷嘴入口处使用湍流和层流两种不同的流动条件进行了两种不同的模拟。将模拟结果与相应的实验测量结果进行了比较。结果表明，喷嘴进气条件对射流流场和远场噪声均有影响。
This paper demonstrates an application of computational aeroacoustics to the prediction of noise generated by a round nozzle jet flow. In this study, the nozzle internal flow and the free jet flow outside are computed simultaneously by a high-order accurate, multi-block, large-eddy simulation (LES) code with overset grid capability. To simulate the jet flow field and its radiated noise, we solve the governing equations on approximately 370 million grid points using high-fidelity numerical schemes developed for computational aeroacoustics. Projection of the near-field noise to the far-field is accomplished by coupling the LES data with the Ffowcs Williams–Hawkings method. The main emphasis of these simulations is to compute the jet flow in sufficient detail to accurately capture the physical processes that lead to noise generation. Two separate simulations are performed using turbulent and laminar inflow conditions at the jet nozzle inlet. Simulation results are compared with the corresponding experimental measurements. Results show that nozzle inflow conditions have an influence on the jet flow field and far-field noise.