【摘要】 针对核电先导式主蒸汽安全阀设计目前存在依靠经验、研制周期长、成本高等问题，采用动网格技术并结合阀瓣动力学方程，建立了适用于先导式主蒸汽安全阀的瞬态仿真模型及方法，实现了阀门动作的精准模拟。在此基础上分析了阀门启闭过程中瞬态流场的变化，讨论了活塞摩擦力及先导阀Kv值对于开启时间的影响。研究表明：数值模拟和试验结果的偏差小于10%。在导阀入口压力为6.17 MPa时能顺利实现主阀的回座。阀杆上方及活塞腔内产生的大量漩涡是阀门振动及噪声的主要来源。开启时间随着摩擦力的增大而增大，随着导阀Kv值的增大而减小。本文为先导式主蒸汽安全阀的优化设计提供了重要的计算方法，可大幅降低阀门研制的周期和成本。更多还原

【Abstract】 For the problems of reliance of design of the nuclear power pilot type main steam safety valve on experience,long development cycle and high cost,the transient simulation model and method suitable for pilot type main steam safety valve were established by using dynamic grid technology combined with valve disc dynamics equipment,which has realized accurate simulation of the valve performance. On this basis,the change of transient flow field during valve opening and closing was analyzed.The influence of piston friction and Kv value of pilot valve on the opening time was discussed. The research shows that the deviations between the simulation results and the test ones are within 10%. When the inlet pressure of the pilot valve is 6.17 MPa,the reseating of the main valve can be fully achieved. A large number of vortices generated above the valve stem and in the piston cavity are the main sources of valve vibration and noise. The opening time increases with the increase of friction force and the decreases with increase of Kv value of the pilot valve. This study provides an important calculation method for optimization design of the pilot main steam safety valve,which can greatly reduce the development cost of the valve.更多还原