前缘锯齿对边界层不稳定噪声的影响

doi:10.7527/S1000-6893.2016.0104

流体力学与飞行力学

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前缘锯齿对边界层不稳定噪声的影响

陈伟杰, 乔渭阳, 仝帆, 段文华, 刘团结

西北工业大学动力与能源学院, 西安 710129

收稿日期:2016-01-13 修回日期:2016-03-29 出版日期:2016-12-15 发布日期:2016-04-08
通讯作者: 乔渭阳,Tel.:029-88482195,E-mail:qiaowy@nwpu.edu.cn E-mail:qiaowy@nwpu.edu.cn
作者简介:陈伟杰,男,博士研究生。主要研究方向:叶轮机械气动声学。E-mail:cwj@mail.nwpu.edu.cn;乔渭阳,男,教授,博士生导师。主要研究方向:叶轮机械气动热力学、气动声学、流动控制技术。Tel.:029-88482195,E-mail:qiaowy@nwpu.edu.cn
基金资助:
国家自然科学基金（51276149，51476134）；空气动力学国家重点实验室研究基金（SKLA20140201）

Effect of leading-edge serrations on boundary layer instability noise

CHEN Weijie, QIAO Weiyang, TONG Fan, DUAN Wenhua, LIU Tuanjie

School of Power and Energy, Northwestern Polytechnical University, Xi'an 710129, China

Received:2016-01-13 Revised:2016-03-29 Online:2016-12-15 Published:2016-04-08
Supported by:
National Natural Science Foundation of China (51276149, 51476134); State Key Laboratory of Aerodynamics Research Fund (SKLA20140201)

摘要/Abstract

摘要：

为探索仿生学前缘锯齿结构的降噪规律，试验研究了低雷诺数到中等雷诺数（Re=（2~8）×10⁵）不同攻角状态下9种前缘锯齿结构对叶片层流边界层不稳定噪声的影响。研究表明：前缘锯齿可以减弱甚至完全抑制边界层不稳定噪声，降噪效果对锯齿振幅和锯齿波长均比较敏感，锯齿振幅越大、波长越小，降噪效果越好，降噪量可达30 dB；前缘锯齿结构可以诱导产生流向涡，影响叶片下游边界层流动，破坏声学反馈回路；前缘锯齿对边界层不稳定噪声峰值频率没有影响。

关键词: 前缘锯齿, 不稳定噪声, T-S波, 分离泡, 声学反馈回路

Abstract:

In order to explore the noise reduction law of the bionics leading-edge serrations, the effect of nine leading-edge serrations on blade laminar boundary layer instability noise has been investigated experimentally at low to moderate Reynolds number (Re=(2-8)×10⁵) and different angle of attacks. It can be concluded that leading-edge serrations can decrease and even totally suppress blade laminar boundary layer instability noise. The noise reduction effect is very sensitive to both serration amplitude and serration wavelength, and the blade with larger amplitude and smaller wavelength has better noise reduction effect, which can reach a maximum of 30 dB. The noise reduction mechanism is attributed to the stream-wise vortices induced by the leading-edge serrations, which can affect blade downstream boundary layer flow and then destroy the acoustic feed-back loop. The leading-edge serrations have no effect on the instability noise peak frequency.

Key words: leading-edge serrations, instability noise, T-S wave, separation bubble, acoustic feed-back loop

中图分类号:

V231

陈伟杰, 乔渭阳, 仝帆, 段文华, 刘团结. 前缘锯齿对边界层不稳定噪声的影响[J]. 航空学报, 2016, 37(12): 3634-3645.

CHEN Weijie, QIAO Weiyang, TONG Fan, DUAN Wenhua, LIU Tuanjie. Effect of leading-edge serrations on boundary layer instability noise[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(12): 3634-3645.

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前缘锯齿对边界层不稳定噪声的影响

Effect of leading-edge serrations on boundary layer instability noise

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