【作者】 张亮；

【导师】 刘伟；

【作者基本信息】 华中科技大学 ， 工程热物理， 2008， 硕士

【摘要】 回路热管(LHP: Loop Heat Pipe)是一种利用工质相变传输热量,并且利用毛细力驱动系统循环的热控装置。其具有传热能力强、热阻低、等温性好、效率高、无运动部件以及传输距离长等优点,从而使其成为了航天器热控以及电子器件散热的有效方式。本文在分析了现有的LHP系统的基础上,设计并研制了小型圆盘式LHP系统,探讨了其优势和不足,提出了改进的思路。评述了LHP系统的研究现状,介绍了LHP系统的工作原理及其运行特性,论述了LHP在实现高热流密度散热方面的优势。设计了小型平面圆盘式LHP系统,平面式结构,能够很好的与发热器件表面贴合,减少了传热热阻,增加了传热效率;蒸发器上盖采用一字槽道,减小了蒸汽的流动阻力,增强了蒸发器上盖的强度;蒸发器底座设计了翅片结构,一方面增强蒸发器的强度,另一方面增强了系统的散热能力,提高了系统的小型圆盘式LHP系统高热流密度散热的可靠性。针对所设计的小型圆盘式LHP系统建立了实验平台,并对其进行了启动和变工况等运行特性实验。实验结果表明,该系统存在一定的侧壁导热效应,使蒸发器底部产生气泡,阻止液体回流,导致系统启动失败。但是在抑制了侧壁导热效应的条件下,系统在高、低热负荷下都具有可靠、简便的启动特性,稳定的变工况运行性能,并且在系统运行过程中没有出现系统干涸现象。众所周知,太空中的散热主要是辐射散热。因此本文设计了真空辐射器,用以模拟太空环境,为以后做模拟真空辐射冷源实验奠定基础。更多还原

【Abstract】 The LHP (Loop Heat Pipe) is such a thermal controlling device, of which the driven potential depends on the phase change of the working fluid and the capillary force. It has those characters that make it very suitable to the thermal management on the satellite and electronic component cooling, such as strong ability heat transfer, low thermal resistance, and passively transporting heat over large distances with minimal temperature losses, high efficiency and contain no moving parts. Based on the analysis of the existing LHP system, a small disc type of LHP system was designed and developed, and advantages and disadvantages were discussed, and some improving approaches were also proposed.After reviewing the researching status of system, the operation principle of LHP system and operation characteristic were introduced, and LHP’s advantages in realizing the heat dissipation of high flux were described. On the basis of analysis, a small-scale plane disc LHP system was designed. Due to the flat plate evaporator had the advantages of perfect thermal contact between evaporator surface and electronics devices surface, it reduced the thermal resistance, enhanced the efficiency of heat transfer and made the isothermal of heated surface more better. The evaporator cover with vapor grooves can not only reduce the vapor flow resistance, but also enhance the strength of the evaporator cover. A structure of fin was designed at bottom of evaporator, on the one hand the intensity of evaporator was increased, and on the other hand the system’s cooling capacity was enhanced, and reliability of the mini-disc LHP system was improved.An experimental platform for the designed small disc LHP system was established, and start-up experiment at different heat flux and changing heat flux operation experiment were conducted. The experimental results demonstrated that the side wall effect of evaporator was very serious, and produced bubbles at the evaporator’s bottom, which prevented the liquid coming back, and led to failure of the system star-up. But the system showed outstanding thermal behaviors and no dry-out phenomena in the condition of restraining the side wall effect.It is well known that radiation is the major cooling method in space. For simulating space environment, a vacuum radiation was designed, which laid the experimental foundation of simulating cold vacuum source.更多还原