Research on transient turbulence characteristics and aerodynamic noise of gas proportional valve

The gas proportional valve (GPV), as the core flow control device of gas boilers, is severely affected by the aerodynamic noise induced by internal turbulence, which seriously affects equipment stability and personnel health. This article uses the LES method and Lighthill acoustic analogy theory to numerically simulate and analyze turbulent vortex and aerodynamic noise under two specific openings. The results indicate that the valve core area is the main noise source, and as the opening increases, the noise source area expands to the upstream and downstream of the valve. At 25% opening, the turbulence intensity of the airflow inside the valve is greater than that at 100% opening, and the local sound pressure level is as high as 123 dB. A new method for valve noise reduction is proposed in this paper. By optimizing the arc chamfer of the valve core structure, the noise is reduced by 4.56 dB at 100% opening and 2.68 dB at 25% opening. This study reveals the generation mechanism of GPV flow noise, and the proposed structure optimization method provides theoretical support and engineering reference for low noise design of industrial valves.