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基于LBM-LES方法翼型纯音噪声数值研究
Numerical Study of Airfoil Tone Noise Based on LBM-LES
投稿时间:2018-08-26  修订日期:2018-11-04
DOI:
中文关键词:  LBM-LES  中低雷诺数  纯音噪声  翼型  直接数值计算
英文关键词:LBM-LES  medium and low Reynolds numbers  tone noise  airfoil  direct numerical calculation
基金项目:江西省科技厅重点研发项目(20151BBE50026);江西省研究生创新基金项目(No. YC2017-S332)资助项目
作者单位E-mail
冯欢欢 南昌航空大学飞行器工程学院 15737193167@163.com 
刘勇 南昌航空大学飞行器工程学院 liuyong@nchu.edu.cn 
王琦 南昌航空大学飞行器工程学院  
邹森 南昌航空大学飞行器工程学院  
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中文摘要:
      基于LBM-LES方法对中低雷诺数下的NACA0012翼型纯音噪声进行了直接数值计算,研究了不同迎角和雷诺数对纯音噪声的影响。计算结果表明:翼型的声源主要位于翼型的分离区和后缘处,在不同迎角和雷诺数下的声辐射特征均具有偶极子声场的特点;迎角的增大将引起较大的旋涡尺度和湍流强度,吸力面声源区域前移。声压级频谱分析表明,随着迎角的增大,纯音噪声逐渐消失,噪声谱最终呈现宽频特征;随着雷诺数的增大,翼型边界层变薄,后缘压力脉动增大。声压级频谱中主频频率随着雷诺数的增大而增大,且符合Paterson公式的幂律关系。此外,声压级频谱特性随着雷诺数的增大表现出由离散特性向宽频特性转变的趋势。
英文摘要:
      Based on the LBM-LES method, the direct numerical calculation of NACA0012 airfoil tone noise at low and medium Reynolds numbers is performed. The effects of different angles of attack and Reynolds number on tone noise are studied. The computation results indicate that the acoustic source of the airfoil is mainly located at the separation zone and the trailing edge of the airfoil. The acoustic radiation characteristics at different angles of attack and Reynolds number have the characteristics of the dipole acoustic field. The increase of the angle of attack will cause a large vortex scale and turbulence intensity, and the acoustic source area of the suction surface will move forward. The sound pressure level spectrum analysis shows that the tone noise gradually disappears and the noise spectrum finally presents broadband characteristics with the angle of attack increases. As the Reynolds number increases, the airfoil boundary layer becomes thinner and the trailing edge pressure pulsation increases. The primary frequency in the sound pressure level spectrum increases with the increase of the Reynolds number, and conforms to the power law relationship of the Paterson formula. In addition, the spectral characteristics of the sound pressure level show a tendency to change from discrete characteristics to broadband characteristics with the Reynolds number increases.
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