针对自主研制的高压气动比例减压阀出现的结冰问题,结合数学仿真和流场计算进行了深入分析。结冰出现在先导阀中间腔而非温度最低的主阀排气腔说明温度并非导致结冰的唯一因素。建立了减压阀的数学模型,计算得出先导阀节流口面积比与先导阀中间腔压力以及温度的关系曲线,并得出使用2级和3级气源时先导阀中间腔结露的临界面积比分别为1.70和1.22。仿真结果表明,通过减小先导阀节流口面积比可以提高先导阀中间腔温度从而减少结冰的可能性。建立了先导阀的网格模型,用Fluent计算出阀内的流场分布,压力流场分布与理论计算符合得较好;速度流场及气流流线图表明出现结冰与气流受阀内结构阻挡有关,通过合理设计流道可有效避免结冰。 According to the problem of icing caused by the self-developed high-pressure pneumatic proportional pressure reducing valve, the mathematical simulation and flow field calculation are carried out in-depth analysis. Freezing occurs in the pilot valve intermediate chamber rather than the lowest temperature main valve exhaust chamber Note Temperature is not the only factor that causes icing. The mathematical model of the pressure reducing valve was established and the relation curve between pilot valve orifice area ratio and pilot valve cavity pressure and temperature was calculated and the results showed that the pilot valve intermediate cavity dew The critical area ratio was 1.70 and 1.22, respectively. Simulation results show that reducing pilot valve orifice area ratio can increase the pilot valve cavity temperature and reduce the possibility of icing. The grid model of the pilot valve was established. The distribution of the flow field in the valve was calculated by Fluent. The distribution of pressure flow field was in good agreement with the theoretical calculation. The velocity flow field and the airflow chart showed that the icing and airflow were affected by the valve structure Obstruction, through the rational design of runners can effectively prevent freezing.