基于LES/Morhing方法的消声器气流再生噪声研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (24) : 162-168.

论文

基于LES/Morhing方法的消声器气流再生噪声研究

孟庆钰，季振林

作者信息 +

A study on flow induct noise of a muffler based on a LES/Morhing method

MENG Qingyu,JI Zhenlin

Author information +

文章历史 +

摘要

本研究采用大涡模拟(Large Eddy Simulation，LES)和Morhing声类比预测了简单膨胀腔消声器内气流再生噪声，仿真和测量结果吻合良好。研究表明，在出口管内距离膨胀腔出口三倍管径内的区域流体脉动压力占据主导地位，而距离膨胀腔出口六倍管径以上区域声压波动占据主导地位。气流再生噪声的产生主要归因于消声器结构变化产生的涡流，最高声源区域在膨胀腔出口处尖角附近区域。在膨胀腔的纵向共振频率和反共振频率处观察到强烈的声学影响。

Abstract

The airflow generated noise inside a simple expansion chamber muffler is predicted by combining Large Eddy Simulation (LES) and Morhing acoustic analogy in the present work, and the good agreement is observed between the predictions and measurements. Research indicates that wall pressure fluctuations are dominated by hydrodynamic pressure fluctuations within the distance of three pipe diameters in the outlet pipe, and wall pressure fluctuations beyond the distance of six pipe diameters downstream are dominated by sound pressure fluctuations. The airflow generated noise is mainly attributed to the vortex generated by structural change in the muffler. The strong influences at the longitudinal resonance frequency and antiresonance frequency of the expansion chamber are observed.

导出引用

孟庆钰, 季振林. 基于LES/Morhing方法的消声器气流再生噪声研究[J]. 振动与冲击, 2024, 43(24): 162-168

MENG Qingyu, JI Zhenlin. A study on flow induct noise of a muffler based on a LES/Morhing method[J]. Journal of Vibration and Shock, 2024, 43(24): 162-168

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