液态甲烷管道预冷过程的仿真研究  

Simulation study on precooling process of liquid methane pipeline

作　　者：陈玉 孙得川 曾卓雄 CHEN Yu;SUN Dechuan;ZENG Zhuoxiong(College of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 201306,China;School of Mechanics and Aerospace Engineering,Dalian University of Technology,Dalian Liaoning 116024,China)

机构地区：[1]上海电力大学能源与机械工程学院,上海201306 [2]大连理工大学力学与航空航天学院,辽宁大连116024

出　　处：《航空动力学报》2024年第4期244-250,共7页Journal of Aerospace Power

摘　　要：低温推进剂液体火箭发动机在推进剂加注时需要进行管道预冷以避免推进剂气化。为揭示管路预冷过程中低温流体的两相流动特性,针对小型液氧/甲烷发动机液态甲烷管道的预冷过程进行了研究。采用Lee蒸发模型,模拟并分析了不同入口流量下的湍流传热过程,得到了管道预冷过程中甲烷的体积分数、温度、压力和速度的变化规律。结果表明:在管道预冷过程中,液态甲烷会发生闪蒸现象,甲烷的温度和压力的变化是影响闪蒸的主要因素;在低流量时,预冷时间与质量流量呈负相关,当质量流量增大到一定程度后,预冷时间趋于稳定值。研究结果可预示容许时间内的最优预冷流量,对提高预冷效率和改进低温推进剂加注过程具有指导作用。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.

关 键 词：液态甲烷 预冷过程 相变 Lee模型 闪蒸 

分 类 号：V421.42[航空宇航科学与技术—飞行器设计]