深冷环路热管稳态运行特性的理论分析
Theoretical analysis of steady-state operating characteristics of a cryogenic loop heat pipe
-
摘要: 基于能量平衡、压力平衡以及质量守恒,建立了氮工质深冷环路热管(CLHP)的稳态数学模型,模拟结果同实验数据具有良好的一致性.应用该模型对CLHP的稳态运行特性进行了理论分析,考察了寄生热载荷、次蒸发器功率等对CLHP运行性能的影响,并得出如下结论:同常温环路热管相比,CLHP的传热能力明显减小;当主蒸发器热载荷较小时,寄生热载荷以及反重力高度的存在使CLHP的稳态运行温度明显升高,而通过对次蒸发器施加功率可显著改善CLHP的工作性能;CLHP最高运行温度/压力随储气室容积的增大而减小,相应的,其最大传热能力将受到限制.Abstract: Based on energy balance,pressure balance and mass conservation,a steady-state mathematical model of a cryogenic loop heat pipe(CLHP) with nitrogen as the working fluid was established in this paper,and the modeling results showed good agreement with the experimental data.Theoretical investigation of the steady-state operating characteristics of the CLHP was conducted based on the mathematical model,where the effects of the parasitic heat load and power applied to the secondary evaporator on the performance of the CLHP was studied.The conclusions below were drawn: the heat transport capability of the CLHP is obviously reduced as compared with ambient loop heat pipe;when the heat load applied to the primary evaporator is small,the steady-state operating temperature is high due to the existence of the parasitic heat load and adverse elevation.However,the performance of CLHP at small heat loads can be notably improved by applying heat load to the secondary evaporator.The maximum operating temperature/pressure drops as the volume of the gas reservoir increases,and the maximum heat transport capability of CLHP will be limited accordingly.
-
Key words:
- loop heat pipe /
- cryogenic /
- heat transfer /
- modeling /
- operating characteristics
点击查看大图
计量
- 文章访问数: 1833
- HTML浏览量: 1
- PDF量: 449
- 被引次数: 0