高压流量调节阀内润滑油雾压燃数值模拟OA

Fire risks associated with lubricating oil mist leakage during the rapid closure of flow regulating valves in high-pressure pneumatic systems are addressed in this study.A numerical model of high-pressure mixture compression combustion is established to investigate the ignition characteristics and underlying mechanisms.High-pressure air and a lubricating oil mixture are taken as the working media.The combustion model and multicomponent transport model are coupled through C-language user-defined functions.The flow field,temperature field,and combustion reaction kinetics characteristics during valve closure are simulated.The compression ignition behavior of lubricating oil mist is revealed.Ignition is promoted by air shock waves through adiabatic compression heating in the stagnation zone and turbulence-enhanced mixing.During rapid valve closure,the small enclosed air region upstream of the valve is subjected to adiabatic isentropic compression.Compression heat is thereby generated,the air volume is rapidly reduced,and the pressure and temperature are sharply increased.As a result,ignition at two key locations is triggered under the combined effects of compression heating and turbulence-enhanced evaporation and oxidation.A reference for improving the reliability of high-pressure pneumatic systems is provided by this model.