高压气动减压阀内部湿空气凝结特性  

Condensation Characteristics of Wet Air Within High Pressure Pneumatic Pressure-reducing Valve

作　　者：任甲辉 李嘉成 樊昱豪 雷伟佳 高隆隆[1] 李宝仁[1] REN Jiahui;LI Jiacheng;FAN Yuhao;LEI Weijia;GAO Longlong;LI Baoren(School of Mechanical Science and Engineering,Huazhong University of Science and Technology,Wuhan,Hubei 430074)

机构地区：[1]华中科技大学机械科学与工程学院,湖北武汉430074

出　　处：《液压与气动》2024年第10期75-84,共10页Chinese Hydraulics & Pneumatics

基　　金：国家自然科学基金(51705164)。

摘　　要：针对高压气动减压阀内部结露结冰的现象,建立高压湿空气凝结流动数学模型,开展高压气动减压阀内部结露机理研究。以湿空气和液滴为流动介质,采用湿蒸汽凝结理论和多组分运输模型,通过C语言和Fluent-UDF编程开发了高压超音速湿空气凝结流动数值模型,搭建实验平台进行数值模型验证。利用该数值模型对高压气动减压阀内部湿空气凝结流动特性进行仿真,并分析了高压超音速流动过程中湿空气的流动凝结行为。结果表明:高压压缩气体流经节流阀口为绝热等熵过程,产生焦耳-汤姆逊正效应,气体体积迅速膨胀,压力和温度急剧下降,流速达到超音速流动;阀口附近下游区域大量成核,液滴快速增长,形成主要凝结区。高压湿空气凝结流动模型可为高压减压阀结构优化及进一步结冰机理研究提供参考。The phenomenon of condensation and icing inside high-pressure pneumatic pressure-reducing valve(HPPPRV),a mathematical model of condensation flow of high-pressure wet air is developed to study the mechanism of condensation inside HPPPRV.Taking wet air and droplets as the flow medium,a numerical model of high-pressure supersonic wet air condensation flow is developed utilizing steam condensation theory and a multi-component transport model via C language and Fluent-UDF programming.An experimental platform is constructed to validate the numerical model.The calculation model is used to simulate the condensation flow characteristics of wet air inside HPPPRV,and the flow condensation behavior of wet air in the high-pressure supersonic flow process is analyzed.The results show that the flow of high-pressure compressed gas via the throttle port is an adiabatic isentropic process,which produces the Joule-Thomson positive effect.The gas volume expands rapidly,the pressure and temperature drop sharply,and the flow velocity reaches supersonic.A large number of nuclei are formed downstream near the valve port,and droplets grow rapidly,forming a main condensation zone.The high-pressure wet air condensation flow model can provide a reference for the optimization of the structure of HPPPRV and further research on the icing mechanism.

关 键 词：高压气动 减压阀 湿空气 结露相变 凝结特性 

分 类 号：TH138[机械工程—机械制造及自动化]