Analysis and Control on Pressure Relief Noise of Automobile Turbocharging System

doi:10.3901/JME.2022.24.223

Abstract

Abstract: While the turbocharging system improves automotive acceleration and fuel economy, it also brings serious noise problems. In order to control the pressure relief noise of automotive turbocharging system, the quasi-steady-state response of the pressure relief valve and the transient-state response of the turbocharging system under the pressure relief conditions are analyzed using the computational aeroacoustics method and the dynamic mesh technology. Combining the broadband noise source models and the acoustic analogy method, the pressure relief noise characteristics of the turbocharging system are obtained. The causes of pressure relief noise under continuous transient condition of automotive turbocharger are revealed, and the relationship between pressure relief noise intensity and intake mass flow rate is clarified. The results show that the pressure relief noise with broadband characteristics is mainly caused by vortex shedding of wall, and the sound source intensity decreases with the decrease of mass flow rate. On this basis, a strategy to control pressure relief noise by reducing the intake mass flow rate is proposed, and the structure of the pressure relief valve is redesigned. After the improvement, the area of the high-intensity sound source is significantly reduced, the total sound pressure level is reduced by about 24 dB on average, and the pressure relief noise is effectively controlled. The effect of the pressure relief noise control is also verified by the actual vehicle test of the physical prototype. The research provides a useful reference for the analysis and control of the pressure relief noise of turbocharging systems commonly faced in the automotive industry.

Key words: automobile, turbocharging system, pressure relief noise, control, pressure relief valve

CLC Number:

U464

YANG Liang, PENG Chuan, LI Peiran, ZHANG Jinyuan, YANG Yang, CHU Zhigang. Analysis and Control on Pressure Relief Noise of Automobile Turbocharging System[J]. Journal of Mechanical Engineering, 2022, 58(24): 223-232.

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