基于高空模拟试车台大口径套筒式柱塞阀流动特性分析

Analysis on Flow Characteristics of Large-Diameter Sleeve Piston Valve Based on Simulated Altitude Test Facility

为了准确描述大口径套筒式柱塞阀内速度、压力和流阻系数的变化规律,通过Fluent软件模拟开度、压比对套筒式柱塞阀流动特性的影响。结果表明:阀内速度和压力都沿着阀芯轴线对称分布,当开度增加时,轴向射流汇集区速度增大,出口速度随之增大,速度均匀性降低,节流窗口处气流压力减小,轴向压力趋于均匀,流阻系数随开度增加先迅速减小后趋于稳定;当压比增大时,进口速度先保持不变而后不断减小,存在临界压比,速度和压力逐渐趋于均匀,压比越大流阻系数下降越显著。

To accurately describe the variation law of velocity,pressure and flow resistance coefficient of the large-diameter sleeve piston valve,the influences of opening degree and pressure ratio on the flow characteristics of the sleeve piston valve were researched through Fluent software.The results show that velocity and pressure are symmetrically distributed along the axis of valve core;when the opening degree increases,the velocity of the axial jet pool area increases,the outlet velocity increases,and the velocity uniformity decreases,the airflow pressure decreases at the throttle window,axial pressure tends to be uniform;the flow resistance coefficient first increases and then remains constant with the increasing of opening degree;when the pressure ratio increases,the inlet velocity first remains constant and then gradually decreases,and it has a critical pressure ratio,the velocity and pressure gradually tends to be uniform;the decrease of flow coefficient becomes more significant with the increasing of pressure ratio.