Aerodynamic Noise Generating Mechanism of Corbula Type Throttle Valves

doi:10.16182/j.issn1004731x.joss.201804050

Abstract

Abstract: The throttle mechanism of pneumatic noise and the noise spectrum characteristics of corbula type throttle valve are studied by targeting on aerodynamic noise problems caused by gas when flowing through the corbula type throttle valve, the method of CFD software with acoustic software simulationis used as well. The studies have showed that when the flow of fluid flows through shrink section, it can be effected by throttling effect, the speed of gas on the hole exit increases rapidly to form under-expanded supersonic jet, causing strong turbulence and shock wave noise. The conclusionis that the construction of throttling gas by small holes is the root cause for fluid noise in the valve. The flow noise within valve is characterized by spectrum of wideband; the aerodynamic noise with low frequency possesses higher energy; the noise amplitude of high frequency drops quickly along the flowing direction of working medium; and the main noise band moves to the low frequency band.

Key words: joint simulation, throttle valve, aerodynamic noise, shock wave

CLC Number:

TP214

Li Yueqin, Xiao Fei, Fan Ming, Xu Xiaodong. Aerodynamic Noise Generating Mechanism of Corbula Type Throttle Valves[J]. Journal of System Simulation, 2018, 30(4): 1615-1621.

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