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采用计算流体力学与声比拟理论相结合的混合方法,探讨了二维圆柱模型在低马赫数下的非定常绕流诱发的噪声算问题。首先采用雷诺时均Navier-Stokes方程计算了二维圆柱模型的非定常流场,与相同参数条件下的计算数据和实验数据进行对比,得到了可靠的流场数据;然后对流场数据进行处理,利用声比拟理论将流场数据转化为声源,通过求解柯尔(Curle)方程计算了远场噪声。将声场的计算结果与文献中的结果进行了对比,得到了较好的噪声计算结果。
By using the hybrid method combining computational fluid dynamics and acoustic simulation theory, the unsteady flow around the two-dimensional cylindrical model is discussed. Firstly, the unsteady flow field of a two-dimensional cylindrical model is calculated by using the Reynolds-averaged Navier-Stokes equations. Comparing the calculated data with the experimental data under the same parameters, the reliable flow field data are obtained. Then the flow field data are processed , The sound field theory was used to convert the flow field data into sound sources, and the far-field noise was calculated by solving the Curle equation. Comparing the calculation results of the sound field with the results in the literature, the better noise calculation result is obtained.