滑阀先导式高压气动减压阀结冰特性

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。

Characteristics of Icing in High Pressure Pneumatic Relief Valve with Slide Pilot

In this article, the critical issue of icing in high pressure pneumatic relief valves is analyzed with mathematical simulation and flow field calculation. The fact that ice is found in the central cavity of the pilot valve rather than in the exhaust cavity of the main valve with much lower temperature indicats that temperature is not the only factor which causes icing. First, a mathematical model of the pressure relief valve is built, and then curves of the throttle area ratio of the pilot valve vs the pres...