A study on generation mechanism and suppression of airflow regeneration noise in expansion the chamber of a muffler

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (16) : 192-199.

LIU Haitao

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Abstract

Combined with the large eddy simulation and acoustic analogy method, the flow field and airflow regeneration noise inside the expansion chamber of muffler were analyzed.The numerical simulation model for the flow field of expansion chamber was set up.The unsteady flow in the expansion cavity was calculated with the large eddy simulation method.A sound field simulation model was established, and the sound source distribution of the airflow regeneration noise was calculated with the information extracted from the flow field simulation results.Through the acoustic analogy method, the airflow regeneration noise source was introduced into the sound field grid to calculate the sound pressure at the far field response point.The simulation results are in good agreement with the experimental results on the sound pressure level and the resonance frequency.According to the generation mechanism of the airflow regeneration noise in the cavity, perforated tube was used to suppress the airflow noise.The experimental setup of airflow regeneration noise was built, and the experimental samples were processed.The noise suppression effect of perforated tube in the expansion chamber with different airflow velocity was analyzed and verified.The results show that the perforated tube in the expansion chamber can effectively suppress the low frequency airflow regeneration noise in the cavity by blocking the formation of the strong shear layer, and with the increase of flow velocity, the noise suppression effect extends to the middle and high frequency range.The suppression effect of the perforated tube in the expansion chamber on the sound pressure level of the airflow regeneration noise improves with the increase of airflow velocity.

Key words

muffler / expansion chamber / airflow regeneration noise / large eddy simulation / acoustic analogy；perforated structure.

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LIU Haitao . A study on generation mechanism and suppression of airflow regeneration noise in expansion the chamber of a muffler[J]. Journal of Vibration and Shock, 2019, 38(16): 192-199

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