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采用随机噪声产生和传播(SNGR)方法对后缘噪声进行数值模拟.SNGR方法结合随机方法和计算流体力学,耗费较少的计算资源就可以预测噪声水平.数值模拟时采用有限体积法求解雷诺平均Navier-Stokes(RANS)方程;采用有限差分法求解声学扰动方程,数值格式采用色散关系保持(DRP)格式,远场边界条件采用无反射边界条件.以二维平板和NACA0012翼型为例,编制程序,与参考结果对比表明,程序可以预测后缘噪声.
The trailing edge noise is numerically simulated by random noise generation and propagation (SNGR) method.The SNGR method can predict the noise level by combining stochastic methods and computational fluid dynamics with less computational resources.In the numerical simulation, the finite volume method is used to solve the Reynolds average Navier-Stokes (RANS) equations were established. The acoustic perturbation equations were solved by the finite difference method. The numerical format was in the DRP format and the far-field boundary conditions were non-reflecting boundary conditions. For two-dimensional slab and NACA0012 airfoil, The comparison of the program with the reference result shows that the program can predict the trailing edge noise.