Simulation study on precooling process of liquid methane pipeline
In order to avoid propellant gasification,cryogenic liquid rocket engine needs pipeline precooling during propellant filling.To reveal the two-phase flow characteristics of cryogenic fluid during pipeline precooling,study was carried out for the precooling process of liquid methane pipeline in a small liquid oxygen/methane engine.The turbulent heat transfer process under different inlet flow rates was simulated and analyzed by Lee evaporation model,and the variation rules of methane volume fraction,temperature,pressure and velocity during the pipeline precooling process were obtained.The results showed that the flash of liquid methane occurred during the precooling process,and the change of methane temperature and pressure was the main factor affecting the flash.At low flow rate,the precooling time decreased with the increase of mass flow rate;when the mass flow rate increased to a certain extent,the precooling time was prone to be stable.The results can predict the optimal precooling flow rate in the allowable time,which has a guiding role in improving the precooling efficiency and the filling process of cryogenic propellant.
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