凹形液氮管道排空过程分析  

Analysis on the discharge process of liquid nitrogen in the concave pipeline

作　　者：邹阳[1,2] 梁文清[2] 钱华[2] 陈虹 

机构地区：[1]航天低温推进剂技术国家重点实验室,北京100028 [2]东南大学能源与环境学院,南京210096

出　　处：《低温与超导》2016年第12期12-15,81,共5页Cryogenics and Superconductivity

基　　金：航天低温推进剂技术国家重点实验研究项目(SKLTSCP1512)资助

摘　　要：低温液体的管路排空为低温工程界常见问题,对安全产生重要影响。为了解低温液体管路排空过程,文中使用常温的氮气对充满液氮的管道进行吹除排空。采用流体力学与两相流的理论计算得到液氮排空过程的参数变化,并分析了不同的氮气温度、流量对液氮排空的影响。结果表明,对于复杂管路建议采用较大质量流量以及较高温度的气源进行低温液体的排空。In the field of cryogenic engineering, it is a common problem to discharge the cryogenic liquid residue in the pipeline. With the gas expelling the liquid propellant, the discharge process has a great influence on the spatial safety. Warm gas nitrogen was used to expel liquid nitrogen out of pipe. By fluid dynamics and two - phase flow theory, the parameters of the emp- tying process could be obtained. The influences of temperature and mass flow rate of nitrogen on the discharse process were ana- lyzed. The results show that for pipeline of complicated structure, it is recommend to use the high mass flow rate and temperature gas to discharge cryogenic liquid.

关 键 词：液氮 排空过程 氮气 相变 

分 类 号：TQ116.15[化学工程—无机化工]