Analysis on Flow Regeneration Noise of Expansion Chamber Muffler
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摘要: 消声器的声学性能受到再生噪声的影响，为了提高消声器的实际使用性能，采用LES-FEM法对膨胀室消声器的气流再生噪声进行探究。首先对单膨胀室消声器分析了结构、流速及扩张腔过渡结构对再生噪声的影响。结果表明：内插管消声器产生的湍动能和再生噪声最小；流速增大使得消声器湍动能和再生噪声声功率级增大；采取圆弧过渡能更好地改善中高频段的再生噪声。其次对多腔膨胀室消声器进行了再生噪声分析优化，根据最大湍流的发生处对内插管末端和入出口管增加不同大小的圆弧结构，消声器再生噪声总声功率级降低9.44 dB，降噪效果显著。Abstract: The acoustic performance of the muffler is affected by the airflow regenerative noise. In order to improve the actual performance of the muffler, the LES-FEM method is used to investigate the flow regeneration noise of the expansion chamber muffler. Firstly, the effect of structural layout, flow velocity and expansion cavity transition structure on regeneration noise is analyzed for the single expansion chamber muffler. The results show that the turbulent kinetic energy and regenerative noise generated by the inner tube muffler are the smallest; when the flow velocity is increased, the muffler turbulent kinetic energy and regenerative noise sound power level are increased; taking the arc transition section can better improve the regenerative noise in the middle and high frequency. Secondly, the regenerative noise of the muffler with multi-chamber expansion chamber is analyzed and optimized. According to the location of maximum turbulence, the arc structures of different sizes are added at the end of the inner tube and the inlet and outlet tube. The total sound power level of the regenerative noise of the muffler was reduced by 9.44 dB, with significant noise reduction effect.
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Key words:
- muffler /
- velocity /
- flow regeneration noise /
- sound power level /
- acoustics /
- structural optimization /
- LES-FEM
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