CFD analog-based valve flow noise simulation of gas pipeline

Flow field for gas pipeline gas flowing through the valve is input into the CFD (Computational Fluid Dynamics) for three-dimensionalsimulation, so as to build the generation model of gas pipeline valve flow noise. Steady-state simulation and transient simulation are carried out for the flow field of gas flowing through the valve. Results show that the pulsating flow in the turbulence (such as pressure and velocity fluctuation) is the root cause for flow noise generation. Valve flow field distribution from the analog simulation is transformed by the Lighthill wave equation to get a dipole sound source so as to obtain generation, transmission and attenuation law of the valve flow noise through valve pipe section flow noise analysis. A test is carried out to verify the valve sound field from the analog simulation, indicating the feasibility of using Fluent software for analog simulation of flow field and sound field of gas flowing through the valve. Research results can provide technical support to the acoustic method leak detection of gas pipeline and theoretical basis to the development of gas pipeline valve noise control methods.