【摘要】 从冷凝器两相区的水动力学不稳定性入手,分析了环路热管的温度波动机理,得出了冷凝器两相区不稳定性是系统温度波动的源动力之一.实验发现以甲醇为工质的环路热管系统温度波动集中发生在热负荷介于12~60 W时,而在该区间之外的较低和较高热负荷范围,系统能够平稳运行,这和理论分析结果相符合.另外,系统温度波动剧烈程度随着系统工质充灌量的增加而明显增强.与以甲醇为工质的环路热管相比,采用汽化潜热较小的丙酮为工质时,系统发生温度波动的热负荷范围变窄,同时温度波动剧烈程度明显降低.更多还原

【Abstract】 The mechanism of temperature oscillation in a loop heat pipe was analyzed on the basis of the instability of two-phase flow at the entrance of a condenser,and the results show that the instability of two-phase flow is one of the sources of temperature oscillation.The experimental results indicate that temperature oscillation occurs as the heat load of the loop heat pipe system is in a range of 12-60 W while the system can operate stably when the load is outside the range,matching the theoretical analysis.Further,the severity of temperature oscillation of the loop heat pipe increases obviously with the increase of charging ratio of working fluid.In addition,compared with the loop heat pipe with methanol as working fluid,the system using acetone with lower latent heat has a smaller range of heat load in which temperature oscillation exists and the severity of temperature oscillation decreases clearly.更多还原