分流气体对冲排气消声器气流再生噪声模型研究

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Abstract Numerical computation was performed for airflow regeneration noise in exhaust muffler with split-flow gas hedging, and the correctness of the computation method was verified with tests.Taking the total sound pressure level of airflow regeneration noise as the response value, the test for airflow regeneration noise was designed using the software Design-Expert.According to regression analysis, a mathematical model of total sound pressure level with test factors including diameter of internal cavity, shape and center distance of hedging hole, cone angle of internal cavity split-flow unit as well as airflow speed was established using Box-Behnken test design scheme, and the model’s significance was tested.Influence laws of second-order interaction of different factors on airflow regeneration noise were deeply analyzed.The results showed that with increase in airflow speed, airflow regeneration noise increases significantly, and its gradient is more than 1; shape and center distance of hedging hole have a significant impact on airflow regeneration noise, and when shape of hedging hole is rectangular and center distance of hedging hole is average value, airflow regeneration noise is smaller; cone angle of inner cavity split-flow unit and diameter of inner cavity have smaller influence on airflow regeneration noise; the optimal test conditions are obtained by taking airflow regeneration noise as the optimization index.

Key words： split-flow gas hedging internal combustion engine muffler airflow regeneration noise total sound pressure level Design-Expert

Received: 11 November 2019 Published: 15 May 2021

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	ZHANG Haijun
	SU He
	WU Pei
	ZONG Zheying
	ZHANG Yong’an
	XUE Jing

Cite this article:

ZHANG Haijun,SU He,WU Pei, et al. Noise model of airflow regeneration in exhaust muffler with split-flow gas hedging[J]. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(9): 63-70.

URL:

http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2021/V40/I9/63

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