Flow Characteristics Optimization of Large-Range Linear Adjustable High-Pressure Air Flow Control Valve

To realize the requirement of large-range linear adjustment of the mass flow rate for the large flow pneumatic system, a high-pressure air flow control valve is designed. On the premise of not affecting its flow capacity, the flow channel of the control valve is designed based on the principle of contraction-expansion nozzle, and the shape of the valve spool is designed. The numerical simulation is carried out by Fluent, and the shape and size of the internal flow channel of the control valve are optimized by response surface analysis so that under the condition of high pressure, high downstream and upstream pressure ratio, equal area of valve body inlet and valve seat throat, the flow velocity of 75 % opening valve port of flow control valve reaches sonic, and the flow state reaches the choking flow state, thus realizing the large-scale linear regulation of the flow control valve. The flow channel optimization design and simulation results in this paper can provide a reference for the optimization design of the same type of high-pressure air flow control valve.