【摘要】 采用动网格技术对某核电厂大气释放阀前置隔离阀开展阀门开启特性的计算流体动力学(CFD)数值模拟研究。在对阀门工作原理分析的基础上建立阀瓣动力学模型,采用切割体网格类型、变形网格方法并耦合阀瓣一维自由体动力学模型建立了描述阀门开启物理过程的CFD分析模型。数值模拟分析表明,先导式阀门开启总时间主要由泄压排放时间所决定,阀瓣动作时间仅约为0.1s,不同蒸汽压力工况下阀瓣运动特性相似,压力越高,阀门开启时间越长,但阀瓣动作时间相对越短。更多还原

【Abstract】 The study was performed based on numerical CFD simulation by means of dynamic meshing. A CFD model was established to reproduce the valve opening behavior, which means that a dynamic valve disc model has been built using the trimmed volume mesh and the deformable mesh coupled with 1 D freedom model of the valve disc. The simulation shows that the total opening time of the pilot-valve is principally affected by the steam discharging time, the disc motion time of about 0.1 s. The disc movement characteristics was similar at different pressure conditions, and the higher the pressure, the longer the disc opening time, but the shorter the disc motion time.更多还原