航空学报 > 2016, Vol. 37 Issue (11): 3317-3327   doi: 10.7527/S1000-6893.2016.0232

尾缘锯齿结构对叶片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   

  1. 西北工业大学 动力与能源学院, 西安 710129
  • 收稿日期:2015-12-31 修回日期:2016-08-10 出版日期:2016-11-15 发布日期:2016-08-12
  • 通讯作者: 乔渭阳,男,博士,教授,博士生导师。主要研究方向:叶轮机气体动力学,航空发动机气动声学。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。Tel.:13468775824,E-mail:cwj@mail.nwpu.edu.cn;乔渭阳,男,博士,教授,博士生导师。主要研究方向:叶轮机气体动力学,航空发动机气动声学。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)

Blade boundary layer instability noise with trailing edge serrations

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

  1. School of Power and Energy, Northwestern Polytechnical University, Xi'an 710129, China
  • Received:2015-12-31 Revised:2016-08-10 Online:2016-11-15 Published:2016-08-12
  • Supported by:

    National Natural Science Foundation of China (51276149, 51476134); State Key Laboratory of Aerodynamics Research Fund (SKLA20140201)

摘要:

实验研究了不同雷诺数(2×105~8×105)、不同攻角状态下,3种相同波长(4%弦长)不同振幅(分别为5%、10%、15%弦长)尾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,在0°攻角状态下,尾缘锯齿会增强甚至诱导产生新的不稳定噪声,显著增大叶片自噪声;在大攻角状态下,尾缘锯齿会减弱甚至完全抑制不稳定噪声,降噪量高达40 dB,降噪机制在于尾缘锯齿结构破坏了不稳定噪声产生所需的声学反馈回路。尾缘锯齿会降低不稳定噪声频率,且锯齿振幅越大,不稳定噪声频率越低。

关键词: 尾缘锯齿, 层流边界层, 不稳定噪声, 声学反馈回路, T-S波

Abstract:

The effect of three trailing edge serrations of the same wavelength (4% of the chord length) and different amplitudes (5%, 10% and 15% of the chord length) on blade laminar boundary layer instability noise is investigated experimentally at low to moderate Reynolds number (2×105-8×105) and different angle of attacks. It can be concluded that at zero angle of attack, trailing edge serrations can reinforce or even induce boundary layer instability noise to lead to an increase of the blade self-noise. At larger angle of attack, instability noise is reduced or even totally suppressed by the trailing edge serrations, resulting in a maximum noise reduction of 40 dB. The noise reduction mechanism can be attributed to the destruction of the acoustic feed-back loop, which is essential for the generation of instability noise, by the trailing edge serrations. Trailing edge serrations will decrease the instability tonal noise frequency, and the instability noise frequency is lower with larger serration amplitude.

Key words: trailing edge serrations, laminar boundary layer, instability noise, acoustic feed-back loop, T-S wave

中图分类号: