Numerical Simulation and Mechanism Analysis of Aerodynamic Noise of Steam Isolation Valve
As one of the key fundamental nuclear power equipment,the steam isolation valve can easily cause high noise problems under high-temperature and high-pressure operating conditions.A multi-step hybrid method of computational fluid dynamics and computational aeroacoustics based on the large eddy simulation and Lighthill acoustic analogy model is used to numerically simulate the fluid-acoustic coupling of the steam isolation valve.The research results indicate that the aerodynamic noise sources of steam isolation valve are located in the middle cavity of the valve body and near the downstream pipe section,and exhibit dipole characteristics.Besides,the noise exhibits a frequency spectrum characteristic dominated by low frequencies.As the frequency increases,the range of sound pressure fluctuations increases and the sound pressure value decreases.There exist sound pressure peaks at specific frequencies,providing reference value for the design of vibration and noise reduction schemes for steam isolation valves.
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