基于麦克风阵列小波分析的中低雷诺数尾缘噪声研究
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宋章辰,男,博士。主要研究方向:翼型尾缘噪声、阵列测试技术。E-mail:songdbs_work@buaa.edu.cn.

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V211;TK263

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国家自然科学基金(12072016, 11772033, 1217021666 和 11721202)


An investigation into trailing edge noise of middle and low Reynolds number based on wavelet analysis of microphone array
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    摘要:

    随着机体噪声逐渐成为民机降噪的关键,作为典型气动噪声源的翼型噪声是未来更低噪声民机必须关注的部分。中低雷诺数下尾缘离散噪声存在阶梯的频率速度关系、层流要求以及偶极子噪声等特征,其噪声机理涉及稳定性理论和反馈回路。尽管尾缘噪声的产生出现和强度都得到比较广泛的研究,但尾缘噪声的空间分布研究尚不充分。基于二维平面麦克风阵列,小波系数和CLEAN-SC算法对于尾缘噪声进行时频域分析。实验在北航D5气动声学风洞进行,使用Kevlar布构成的闭口实验段对于300 mm的NACA0012翼型进行噪声研究。通过实验中发现的固定频率范围内存在强度维持现象,基于小波分析拆解出对应的空间时域上声源强度的位置间歇性移动,提供可能存在的反馈回路内部更为复杂噪声机理的依据。

    Abstract:

    Since airframe noise gradually plays a key role on civil aircraft noise reduction, airfoil noise, which is a typical source of aerodynamic noise, must be paid attention to in further noise reduction in civil aircraft industry in the future. The trailing edge discrete noise at low and medium Reynolds numbers has characteristics such as ‘ladder’ frequency speed relationship, laminar flow requirements, and dipole noise. Its noise mechanism is concerned with stability theory and feedback loop. Although the appearance and intensity of trailing edge noise have been extensively studied, the research on the spatial distribution of trailing edge noise is still insufficient. Based on wavelet coefficients and CLEAN-SC algorithm, a two-dimensional planar microphone array was applied to analyze the trailing edge noise in the time-frequency domain. The experiment was carried out in the Beihang D5 aeroacoustics wind tunnel. The closed experimental section composed of Kevlar cloth was used to conduct noise research on the NACA0012 airfoil with a chord length of 300 mm. Through the phenomenon of intensity maintenance in the fixed frequency range found in the experiment, the position of the sound source intensity in the space and time domain corresponding to the wavelet analysis disassembled intermittently moves, which further confirms the more complicated mechanism that may exist in the feedback loop.

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宋章辰,郭昊,刘沛清.基于麦克风阵列小波分析的中低雷诺数尾缘噪声研究[J].民用飞机设计与研 究,2022(1):38-44SONG Zhangchen, GUO Hao, LIU Peiqing. An investigation into trailing edge noise of middle and low Reynolds number based on wavelet analysis of microphone array[J]. Civil Aircraft Design and Research,2022,(1):38-44. ( in Chinese)

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  • 在线发布日期: 2022-04-17
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