Numerical simulation of transonic cavity on acoustic properties

Abstract

Abstract: A three-dimensional unstructured Navier -Stokes solver is employed for the numerical analysis of an open rectangular cavity with a length-to-depth (L/D) ratio of 5 and a width-to-depth (W/D) ratio of 1 on aerodynamic noise. Cubic k-turbulence model is used to obtain turbulent flow field, conduct artificial reconstruction and predict the near-field cavity noise combining with nonlinear acoustic solver (NLAS). Numerical results are compared with experimental data of sound pressure level (SPL), power spectral density (DSP) along cavity floor,experimental data, calculated value, formula-calculated values and resonant frequency of high-order numerical schemes in order to verify the rationality of the above method. To suppress the cavity noise and improve the environment for cavity flow field, other three kinds of structure modification are taken. Cavity SPL, the overall
SPL, vortex iso-surface under Q criterion and the nephogram of Lamb Vector under four conditions are compared and the result shows that the trailing edge slope most conducive to reduce noise by about 5db

Key words: aerodynamic noise, nonlinear acoustic solver, resonance frequency, sound pressure level, noise reduction

CLC Number:

V211
TB84

MA Lixuan, LI Enyi, SUN Shuxia, YANG Qingxiang. Numerical simulation of transonic cavity on acoustic properties[J]. Journal of Civil Aviation University of China, 2020, 38(5): 10-15.

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