Numerical Simulation Analysis of Main Steam Relief Valve Opening Characteristics by Dynamic Mesh

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.