【摘要】 本文采用声类比法探讨了射流中小尺度湍流远场噪声特性。此声类比理论基于线化欧拉方程及声源互易原理,建立了关联声源和远场声压的伴随格林函数,适于声波折射现象及小尺度湍流噪声计算。声场的边界采用完全匹配层边界条件,有效地避免了声波产生数值反射。为减小频散及耗散误差,时空导数均采用高阶预测-校正格式离散控制方程。计算结果与前人的实验相一致。更多还原

【Abstract】 In this paper,the fine scale turbulent jet noise was calculated based on acoustic analogy. The sound wave propagation model is based on linerised euler equation and sound reciprocal principal, which associate the sound source and the farfield jet noise.The perfect match layer was attached on the computational domain boundary,which can avoid the production of spurious wave from boundary. To reduce the dissipation and dispersion errors,high order prediction and correction scheme was implemented.The results seem to agree well with the former experiments.更多还原