结霜工况下低温氢气空浴回温器传热性能分析  

Analysis on heat transfer performance of a cryogenic hydrogen-air heat exchanger under frosting condition

作　　者：陈虹 李亦健[2] 吴云翔[2] 高旭 张亮亮 汤珂[2] 金滔[2] 

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]浙江大学制冷与低温研究所浙江省制冷与低温技术重点实验室,杭州310027

出　　处：《低温工程》2015年第3期24-29,共6页Cryogenics

基　　金：航天低温推进剂技术国家重点实验室基础研究课题(SKLTSCP1304)资助

摘　　要：为一套用于低温氢气回温的空浴式换热器建立了传热模型,着重考察结霜工况对传热性能的影响。针对等霜层厚度和线性变化霜层厚度等两种模型,计算和分析了不同风速对回温器的温度分布的影响以及满足复温需求的最小换热管长度。鉴于实际结霜工况应该介于两种理想霜层模型之间,为满足该低温氢气回温器换热要求,最低管外空气强制对流风速也应介于两种理想模型所要求的最低风速之间,即1.3—2.1 m/s之间。A heat transfer model was constructed to analyze the performance of a hydrogen-air heat ex- changer, for rewarming the cryogenic hydrogen, under frosting condition. Based on two different frost layer thickness models （constant thickness model and linear varying thickness model） , the temperature distribu- tion in the rewarming heat exchanger were simulated and analyzed. The influence of air velocity on the tem- perature distribution and the minimum length of heat transfer pipe to meet the demand of rewarming were then discussed. Considering that the real frosting condition should be an intermediate model between the two ideal frost layer thickness models, the lowest air velocity outside the pipe in order to satisfy the heat transfer demand should also be between the required minimum air velocity for those two ideal models, i. e. , 1.3-- 2.1 m/s.

关 键 词：氢气 回温器 传热性能 霜层厚度模型 

分 类 号：TB65[一般工业技术—制冷工程]