氦气对低温液氧箱体分层压增的影响  

Influence of Helium on Process of Thermal Stratification and Pressurization in Cryogenic Liquid Oxygen Tank

作　　者：刘展[1] 厉彦忠[1,2] 谢福寿[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]航天低温推进剂技术国家重点实验室,北京100028

出　　处：《西安交通大学学报》2016年第4期139-146,共8页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51376142);航天低温推进剂技术国家重点实验室开放课题资助项目(SKLTSCP1505)

摘　　要：为研究气枕中氦气对低温液氧分层及压增的影响,以柱状液氧箱体为例,通过改变气枕中氦气以及氧气含量来改变箱体初始压力,分别计算了初始箱体压力相同以及初始箱体压力不同两种工况下液氧分层压增参数的变化。结果表明:氦气的存在增强了气枕与箱体壁面以及气液界面的对流换热,促进了界面的蒸发相变,并带来了质扩散传递。当箱体初始压力不变时,箱体压增以及气液界面相变量随着氦气含量的增加而增加。在初始氦含量由0.0kg增加到0.563kg的过程中,箱体压增增加了20.91%,气液界面总相变量增加到初值的7.87倍。当箱体初始氧含量保持不变时,箱体压增随着氦气含量的增加而减小,而界面总相变量则呈现相反的变化趋势。在初始氦含量由0.0kg增加到0.2kg的过程中,箱体压增下降了28.66%,但气液总相变量却增加到初值的4.3倍。Cylindrical liquid oxygen tank is chosen to investigate the effect of helium on the process of thermal stratification development and pressurization.The initial tank pressure can be adjusted by changing proportions of gas helium and gas oxygen.The variations of thermal stratification and pressurization parameters are analyzed under conditions of equal and different initial tank pressure.It is found that gas helium enhances the natural convection intensity occurring between tank wall and liquid-vapor interface to strengthen evaporation phase change and mass diffusion.When the initial tank pressure keeps constant,both tank pressure increment and total phase change amount rise with increasing helium component.When the initial gas helium ranges from 0.0kg to 0.563 kg,the tank pressure increment rises by 20.91%,the total phase change amount rises by 7.87 times.When the initial oxygen keeps constant,the tank pressure increment drops with the increasing initial helium quantity,and the total phase change amount tends oppositely.When the initial gas helium ranges from 0.0kg to 0.2kg,the tank pressure increment drops by 28.66%,and the total phase change amount rises by 4.3times.

关 键 词：氦气 低温液氧箱体 热分层 质扩散 

分 类 号：V511[航空宇航科学与技术—航空宇航推进理论与工程]