Numerical Prediction and Analysis on Cavitation Noise of Control Valve Based on Fluid-Acoustic Coupling Method

As for the cavitation problem could commonly occuring in the control valve in engineering application and the noise caused by it, a method of numerical predicting the cavitation noise value in the control valve based on the fluid-acoustic coupling methodis proposed.And this method was used to numerically calculate the noise of an axial flow control valve in cavitation and no cavitation conditions, respectively.The large eddy simulation and cavitation model were selected by the fluid-acoustic coupling method to calculate the transient flow field of the control valve at first.Then the acoustic boundary element method was used to calculate the noise field characteristics by using the flow field information.The results indicate thatthe overall trend of the frequency response curve at the sound pressure level of the monitoring point is approximately the same.The sound pressure level frequency response curve in cavitation condition has more peak points. However, no cavitation is more stable, which can be used as the basis for judging whether to generate cavitation in the control valve.The relative error between the total sound pressure level at the monitoring point obtained by the numerical calculation and the theoretical prediction is less than 7.1%, it could prove the accuracy and feasibility of numerical calculations.