考虑地面影响的半空间气动噪声数值计算方法

doi:10.7527/S1000-6893.2013.0354

Abstract

Abstract:

Aerodynamic noise in a half-space with non-compact boundaries widely exists in the area of aviation.When calculating noise problems numerically, the effects of the ground and other non-compact boundaries must be considered. Based on the Lighthill analogy and the generalized Green function method, the non-compact boundary effects and the fluid compressibility can be taken into consideration by bringing in the boundary sound pressure integral term and the compressible correction term. However, the integral along the infinite ground must be calculated when solving a half-space noise problem. In order to reduce the high computational expense, a new method using the half-space Green function is derived in the frequency domain based on the properties of sound reflection on a large flat. Meanwhile, through the numerical simulation of the stress noise and the flow-induced noise around a cylinder in a half-space, the accuracy and efficiency of the new method is validated.

Key words: aerodynamic noise, Green function method, half-space, non-compact boundary, acoustic analogy

CLC Number:

V211.3
O355

PANG Chuanbo, WANG Fang, CAI Jinsheng, LIU Qiuhong. A Numerical Method of Predicting the Aerodynamic Noise in a Half-space with Ground Effects[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(3): 666-673.

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A Numerical Method of Predicting the Aerodynamic Noise in a Half-space with Ground Effects

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