液氮管道排空过程CFD模拟及分析  

CFD simulations and analyses on emptying process of nitrogen pipeline

作　　者：陈虹 邹阳[2] 梁文清[2] 钱华[2] 高旭 

机构地区：[1]总装备部工程设计研究总院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：《东南大学学报（自然科学版）》2016年第6期1246-1250,共5页Journal of Southeast University：Natural Science Edition

基　　金：航天低温推进剂技术国家重点实验室开放课题资助项目(SKLTSCP1512)

摘　　要：为研究低温管路中低温液体的排空过程,采用计算流体力学(CFD)方法中非稳态流动以及流体体积(VOF)模型对管路中液氮向外排空过程进行模拟计算,并将模拟结果与实验结果进行对比验证.模拟结果显示,当氮气质量流量较小时,氮气虽然会在一定时间内到达出口,但管道底部仍存有液氮,出现分层现象.这就需要通过氮气带进的热量使液氮受热蒸发排空,致使完全排空时间变长.随着氮气质量流量的增大,排空时间变短.当氮气流量增加到一定数值时,管道底部无液氮残留,可以直接完全排空.该研究结果可以同时为排空低温液氢等危险流体提供理论指导.To investigate the emptying process of pipeline of cryogenic liquid, unsteady flow and volume of fluid （VOF） models in computational fluid dynamics （CFD） method were used to simulate of release process of the liquid nitrogen. Simulation results were validated by experimental results. The simulation results show that when nitrogen flow rate is lower, it can throughout the pipe for some time but some liquids remain in the pipe bottom. And the stratified phenomenon can be obtained. By using nitrogen injection to heat liquid nitrogen and make it evaporated, it can be empty totally at the end. Also the totally emptying time of liquid is longer. With the nitrogen flow rate increasing ,the empty time is shorter. When nitrogen flow rate is beyond a certain level, the nitrogen can push and empty the nitrogen directly and no liquid remains. The results also provide a theoretical guidance for emptying liquid hydrogen and other dangerous cryogenic liquids.

关 键 词：管路排空 低温液体 数值模拟 流体体积 

分 类 号：TB611[一般工业技术—制冷工程]