A research of floating poppet valve's open-closed dynamic characteristics

High temperature gas valve plays an important role in the divert and attitude system of solid aerocraft. A 2-D unsteady simulation, based on the research of gas valve at home and abroad and the static force and coulomb friction model, was designed using dynamic grid and UDF technology to investigate the process of open-closed of gas valve. Calculation results show that the non-uniformity of gas valve is increasing compared with that of normal nozzle, and the change is similar in open-closed gas valve and nozzle flow field. The subsonic backflow area, flow separation and the distribution of the oblique shock wave in the valve flow field were analyzed under different openings during the open-closed process, and the simulation is real and effective for the open-closed characteristics of gas valve. The simulation results show that the valve structure is reasonable and feasible.