为了研究热管绝热段长度和位置的变化对其性能产生的影响，搭建实验台测试了碳钢-水重力热管在不同功率与绝热段长度下的稳态与非稳态性能，分析热阻、传热量和等效对流换热系数的变化及间歇沸腾对热管运行的影响。结果表明：实验范围内，随着功率的增大，启动时间缩短，启动温度升高；绝热段长度的增加有利于启动性能的增强；传热性能与功率呈正相关、与绝热段长度呈负相关，当绝热段长度为零、功率为300 W时性能最佳，此时等效对流传热系数为1 253.12 W/(m2·K)，传热量为275.04 W，热阻为0.034 K/W；功率的增大加快了间歇沸腾频率，绝热段长度的增加进一步推动这一过程，促进内部达到平衡。

In order to study the effect of the variations of length and position of heat pipe adiabatic section on its performance,an experiment platform was built to test the steadystate and unsteadystate performances of a carbon steelwater gravity heat pipe under different heating power and adiabatic section lengths,study the changes of thermal resistance,heating power output and equivalent convective heat transfer coefficient and analyze the effect of geyser boiling on heat pipe operation.The results show that with the increase of heating power,the startup time is shortened and the startup temperature is increased in the experimental range; the increase in the length of the adiabatic section is conducive to the enhancement of the startup performance.The heat transfer performance is positively correlated with the heating power and negatively correlated with the length of the adiabatic section.The best performance is achieved at the adiabatic section length of 0 and the heating power of 300 W.At this time,the equivalent convective heat transfer coefficient reaches 1 253.12 W/(m2·K),with the heating power output of 275.04 W and the thermal resistance of 0.034 K/W.The increase of heating power accelerates the geyser boiling frequency,and the increase of the length of adiabatic section further promotes the process to achieve internal equilibrium.

TK172

天津市科技计划项目（18YFCZZC00080）