船用合流型三通调节阀声流固耦合声学特性研究OA北大核心CSTPCD

Based on the acoustic-fluid-solid coupling theory,the acoustic characteristics of a PN50 DN250 three-way control valve model are established and studied.The steady state flow in the valve is analyzed based on the k-ε model.On the basis of steady convergence,the large eddy simulation(LES)unsteady flow is carried out.And the fluid-solid coupling surface and the pulsating sound source information generated by acoustic-solid coupling in time domain are derived and used as the noise excitation source to study the acoustic characteristics of the three-way control valve under different working conditions.Then,the test bench is built for testing the flow noise of the three-way control valve.The results show that the flow-induced vibration noise level of the valve at testing condition is only 1.85 dB(A)lower than the measured noise sound pressure level under the actual working condition,which verified the accuracy of the acoustic-fluid-solid coupling numerical simulation method.The acoustic characteristics of the noise under the actual working conditions of the valve under 80%and 60%opening rates are numerically simulated.The sound pressure levels of the valve noise are 51.18 and 54.13 dB(A),respectively,which verify that the noise of the three-way control valve meets the requirements of the use.The proposed numerical simulation method of acoustic-fluid-solid coupling has provided a reference for the analysis of the acoustic characteristics of the combined flow of three-way control valves.