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