微型航空气压电磁阀流场仿真分析

Flow Field Simulation Analysis of Micro Pneumatic Solenoid Valve

为了探寻动阀芯开度对微型航空气压电磁阀内部流场的影响,从而找到合适的动阀芯开度范围,同时对电磁阀内部流道进行结构优化,针对某型机载微型航空气压电磁阀进行了数值模拟及流量试验。首先建立了5组动阀芯不同开度时的流道三维模型,接着分别对流道模型进行了6个不同进气压力下的仿真计算,详细分析了动阀芯开度对气压电磁阀内部流场的压力分布、流速、湍流动能、出口流量的影响,同时对出口流量值进行了数据处理,通过与流量实测值进行对比,校核了电磁阀设计经验公式中的重要参数呼吸系数。结果表明,电磁阀开度大于0.3mm可以避免气蚀产生;由于气体经过动阀芯两段对称沟槽后对向喷射进入静阀芯气孔,此区域为电磁阀内湍流强度最大区域。

To explore the influence of the dynamic spool opening on the internal flow field of the micro pneumatic solenoid valve, and find out the suitable range of dynamic spool opening values, numerical simulation of a certain type of micro pneumatic solenoid valve are carried out.Firstly, five groups of flow path model are built, then carry out the simulation calculations of the flow path model under 6 different inlet pressures, analyze effects of the opening values on five parameters, process the data of the outlet flow value.Results show that cavitation can be avoided when the spool opening is greater than 0.3 m.The gases pass through the two symmetrical grooves, then injects into stomata of the static spool in opposite direction, this area is the largest turbulence intensity in the pneumatic solenoid valve.