文献类型：会议论文

英文题名：Numerical simulation of leakage flow field and acoustic characteristics for safety valve

作者：Qian, Fan[1];Hu, Minghui[1]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

会议论文集：2nd International Conference on Computer Science Communication and Network Security (CSCNS)

会议日期：DEC 22-23, 2020

会议地点：Sanya, PEOPLES R CHINA

语种：英文

摘要：Aiming at the internal leakage problem of spring type nuclear safety valve at the sealing surface, the flow field and sound field characteristics at the leakage height of 0.5mm between the valve disc and the valve seat sealing surface were studied, and the numerical simulation was carried out based on large eddy simulation(LES) and mohring acoustic analogy method, and compare the effects of acoustic wall pressure fluctuation(AWPF) and turbulent wall pressure fluctuation(TWPF) as the excitation source on the external sound field of the valve. The simulation results show that: the change gradient of velocity field and pressure field at the leakage port of safety valve is significant and form vortices of different sizes. The small-scale vortices are mainly in the leakage port, while the large-scale vortices mainly exist in the flow channel; When the valve is leaking, the noise is mainly dominated by high-pressure injection noise, its spectrum curve shows wide-band characteristics, and the external noise of the valve is mainly caused by AWPF. The above research results can provide a theoretical basis for the safety valve online detection method.