一种预测平板尾迹噪声的时域无网格方法

doi:10.7527/S1000-6893.2015.0008

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2015, Vol. 36 ›› Issue (11): 3501-3514.doi: 10.7527/S1000-6893.2015.0008

• Fluid Mechanics and Flight Mechanics • Next Articles

A grid-less time domain method for plate trailing edge noise prediction

HONG Zhiliang^1,2, GAO Ge², JING Xiaodong¹, SUN Xiaofeng¹

1. School of Energy and Power Engineering, Beihang University, Beijing 100191, China;
2. Technology Center, Shenyang Liming Aero-Engine Group Co. LTD., Shenyang 110043, China

Received:2014-11-27 Revised:2015-01-07 Online:2015-11-15 Published:2015-01-27
Supported by:
National Natural Science Foundation of China (51306006, 51076006);National Basic Research Program of China (2012CB720200)

Abstract

Abstract:

A grid-less time domain method for predicting trailing edge noise radiated from a two-dimensional flat plate is established in the present study, which is based on the discrete vortex method and vortex sound theory. The trailing edge noise is calculated in a decoupling manner. Firstly, the shear layer shed from the plate trailing edge is simulated through a discrete vortex method, and the key parameters of the vortices are obtained, including the strengths, positions and velocities. Then, a sound radiation model of the vortices in the free space is deduced in the frame of the vortex sound theory. Besides, to account for the influence of the plate surface, a time domain boundary element method is introduced. After that, the sound pressure distribution and the far field directivity radiated from the trailing edge vortices are analyzed. The present results indicate that the vortex clouds rolled up by point vortices are typically dipole sources, and the scattering effect from the plate surface can not only enhance the sound pressure level but also lead the maximum sound pressure to propagate in the vertical direction to the surface. This grid-less model depicted here simulates the flow and sound field simultaneously, which can help to improve the basic understanding on the trailing edge noise radiation and provide a reliable method for noise investigation with engineering importance as well.

Key words: aero acoustic, trailing edge noise, grid-less method, discrete vortex method, vortex sound theory, time domain boundary element method

CLC Number:

V231.1

HONG Zhiliang, GAO Ge, JING Xiaodong, SUN Xiaofeng. A grid-less time domain method for plate trailing edge noise prediction[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(11): 3501-3514.

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A grid-less time domain method for plate trailing edge noise prediction

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