航空科学技术2023，Vol.34Issue(12)：30-36,7.DOI:10.19452/j.issn1007-5453.2023.12.004
基于声扰动方程的气动噪声传播积分计算方法
Integral Computation Method of Aerodynamic Noise Propagation Based on the Acoustic Perturbation Equations
摘要
Abstract
The integration method of far-field sound propagation based on the traditional acoustic analogy theory assumes that the acoustic medium is uniform,and it is difficult to account for the sound refraction in non-uniform media which causes large numerical errors in the prediction of noise field.In this paper,the acoustic perturbation equation is used to describe the sound wave motion,and the adjoint Green's function is constructed in the frequency domain to relate the near-field sound source and the far-field sound pressure based on the acoustic reciprocity principle,so that the refraction effect of the inhomogeneous media is included in the adjoint Green's function.By combining the numerical results of the adjoint Green's function and the source terms of the acoustic perturbation equations,the spatial propagation of aerodynamic noise is calculated by the integration method.Combined with the above method,numerical prediction research is carried out for the noise induced by flow around the two-dimensional cylinder and NACA0012 airfoil,and the far-field sound pressure prediction results are in good agreement with that directly obtained by CFD.The integral calculation method of aerodynamic noise propagation based on the acoustic disturbance equation takes into account the influence of non-uniform media on sound propagation,which can improve the prediction accuracy of aerodynamic noise.关键词
声扰动方程/伴随格林函数/气动噪声/声折射Key words
acoustic perturbation equations/adjoint Green's function/aerodynamic noise/sound refraction分类
航空航天引用本文复制引用
郑雯斯,王芳..基于声扰动方程的气动噪声传播积分计算方法[J].航空科学技术,2023,34(12):30-36,7.基金项目
航空科学基金(201914053001) Aeronautical Science Foundation of China(201914053001) （201914053001）
