加氢站用高压氢气单向阀不同入口压力的瞬态流动特性研究OA

In high-pressure hydrogen environments,check valves are vulnerable to damage and failure caused by high-velocity gas impacts,making it critical to investigate their internal transient flow behaviors.In this study,a transient Computational Fluid Dynamics(CFD)method combined with dynamic mesh technology was employed to establish a high-pressure hydrogen flow model inside a check valve.The hydrogen flow velocity and pressure distribution during the valve opening process were analyzed.Furthermore,the fluid force,motion velocity,and acceleration acting on the valve poppet were quantified to explore the influence of inlet pressure on the dynamic characteristics and impact effects of the poppet.The results indicated that the valve poppet opened within milliseconds,with the fluid force being significantly greater than the spring force and reaching a maxi-mum of 1 030 N.Additionally,the inlet pressure had a profound effect on the dynamic response of the poppet:as the pressure increased from 5 MPa to 35 MPa,the opening time shortened from 2.5 ms to 0.76 ms,the max-imum impact velocity of the poppet increased from 3.9 m/s to 9.9 m/s,and the peak fluid force surged from 400 N to 1 600 N.Such high-speed impacts were prone to causing severe collisions between the poppet and the valve seat,thereby increasing the risks of sealing failure and structural damage.Consequently,it was recom-mended to adopt a multi-stage refueling process during hydrogen filling to control the pressure difference and mitigate the impact.These findings provide a valuable reference for the optimal design and safe operation of check valves in high-pressure hydrogen systems.