置于声源两侧的旁通管道噪声自抵消研究

张浩;周城光;刘碧龙;刘克

振动与冲击 ›› 2014, Vol. 33 ›› Issue (5) : 109-114.

PDF(1897 KB)
PDF(1897 KB)
振动与冲击 ›› 2014, Vol. 33 ›› Issue (5) : 109-114.
论文

置于声源两侧的旁通管道噪声自抵消研究

  • 张浩1,2,周城光1,刘碧龙1,刘克1
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An investigation on noise self-cancellation method using Herschel–Quincke Tube placed on both sides of ducted fan

  • ZHANG Hao1,2, ZHOU Chengguang1, LIU Bilong1, LIU Ke1
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摘要

利用轴流机械流动噪声的偶极子特性,把旁通管道置于轴流机械两侧,使其向两侧辐射的同幅反相声波相互抵消,从而降低其流动噪声。用平面波模型对噪声自抵消方法进行了分析,并通过仿真计算和实验研究进行了验证。研究表明:当旁通管有效长度为波长的整数倍时,插入损失最大;为半波长的奇数倍时,插入损失为零。与普通旁通管消声器不同,由于轴流机械辐射噪声主要为偶极子噪声,因此在趋于零的极低频段,旁通管自抵消系统的插入损失并不为零。频率趋于零时的插入损失与主管道和旁通管道的截面积比和有效长度比相关。平面波模型的理论结果与仿真计算结果以及空气管道实验结果在低频部分吻合较好,在中高频段平面波模型的峰值频率与仿真结果和实验结果略有差异。

Abstract

Ducted fan noise attenuation method using Herschel–Quincke Tube (HQ Tube) placed on both sides of ducted fan is studied by theoretical and experimental method. The results show that the insertion loss of the system is zero when the effective length of the bypass duct is odd times of half wave length. However, the sound attenuation performance is good when it’s even times. Different from usual HQ Tube, the insertion loss of the system shown in this paper is not zero when the frequency is approaching zero because dipole noise is the main part of the ducted fan noise. The insertion loss of the system when the frequency is approaching zero depends on the length ratio and area ratio between bypass duct and main duct. Comparison to the theoretical method, simulation method and experimental method show that the results are agree with each other at low frequency, but have small differences at middle and high frequency range , the reason is plane wave is not the only wave in the duct .



关键词

声学 / 旁通管道 / 流动噪声控制 / 自抵消

Key words

Acoustics / Bypass duct / flow noise control / self cancellation

引用本文

导出引用
张浩;周城光;刘碧龙;刘克. 置于声源两侧的旁通管道噪声自抵消研究[J]. 振动与冲击, 2014, 33(5): 109-114
ZHANG Hao;ZHOU Chengguang;LIU Bilong;LIU Ke. An investigation on noise self-cancellation method using Herschel–Quincke Tube placed on both sides of ducted fan[J]. Journal of Vibration and Shock, 2014, 33(5): 109-114

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