液氮发动机换热器的结霜研究  

Research of frost on heat exchanger of liquid nitrogen engine

作　　者：于得水[1] 袁祖强[1] 纪和平 

机构地区：[1]南京工业大学机械与动力工程学院,南京210009 [2]青岛天人环境股份有限公司,青岛266001

出　　处：《低温工程》2010年第3期61-64,共4页Cryogenics

摘　　要：液氮汽车换热器的性能决定着液氮发动机的工作效率。分析了结霜对换热器性能的影响,阐述了换热器结霜的数学过程,并对如何避免换热器的结霜进行研究。提出了两种新型的避免结霜方法:采用预混和式换热器和改变翅片间距。通过试验发现这两种方法可以有效的防止换热器的结霜,提高换热器的汽化效率。The performance of liquid nitrogen heat exchanger determines the efficiency of engine. The effect of the frost on the heat exchanger, and the mathematical process of the frost were analyzed and expoctiated. Besides, how to avoid to frost on the heat exchanger was investigated. Two new methods for avoiding frost were proposed. From the experiment, it can be concluded that those methods can avoid frosting effectively and improve vaporization＇ s efficiency of the heat exchanger.

关 键 词：液氮发动机 换热器 结霜 

分 类 号：TK172[动力工程及工程热物理—热能工程] TB663[一般工业技术—制冷工程]