CFD Simulation on Flow Field of a Large Flow Rate High Speed On/off Valve

The large flow rate high speed on/off valves (LFHSV) have often been used to control flow or pressure in large power applications due to its fast switching. However, the applications of LFHSV are limited by vibration and noise. In this paper, CFD simulations of a two-stage LFHSV are conducted to analyze the flow field characteristics of the main poppet valve, including flow simulation under fixed opening and the transient flow simulation. Results showed that there are two vortexes formed in the flow channel which extract the energy from the main flow and intensify the fluid noise, and that the inlet pressure peak increases by 8.6% in the closing stage. The results will provide guidance for the optimal structural design of high speed on/off valves.