跨声速空腔声学特性数值模拟

摘要/Abstract

摘要： 利用三维非结构N-S 求解器，对长深比为5：1、宽深比为1：1 的开式矩形空腔气动噪声进行了数值分析。采用Cubic k-着湍流模型求解空腔流场并进行人工重构，结合非线性声学求解器渊NLAS冤预测空腔近场噪声特性。通过对比空腔底部声压级和功率谱密度的实验值与计算值，以及实验值、计算值、公式计算值和高精度格式值的谐振频率，验证上述计算方法的合理性。为抑制空腔噪声、改善空腔流场环境，采取3 种修形结构，对比4 种工况下空腔声压级、总声压级、Q 准则下的涡等值面及Lamb Vector 模云图，结果表明，尾缘斜面最有利于降低噪声，大约可降低5 dB。

关键词: 气动噪声, 非线性声学求解器, 谐振频率, 声压级, 降噪

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

中图分类号:

V211
TB84

马丽璇, 李恩义, 孙书霞, 杨庆祥. 跨声速空腔声学特性数值模拟[J]. taptap下载安装安卓学报, 2020, 38(5): 10-15.

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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