为探究环路热管(loop heat pipe, LHP)蒸储漏热、气液演变以及性能三者之间的关联，设计了一套全可视化实验系统，该系统能够在监测温度、压力与质量流量的同时观察其内部工质气液分布的变化，实验装置中利用石英玻璃与PFA管作为可视化手段，并对该LHP在升功率工况（5-10-15-20-25 W）下的运行过程展开研究。对比分析了随着热负荷升高，储液器液位高度、冷凝器管线气液界面高度与热阻的变化趋势，并通过实验参数计算其蒸储漏热量，与可视化现象进行对比分析。研究表明：随着热负荷的升高，蒸储之间漏热加剧，中心通道内由核态沸腾产生大量气体工质，导致储液器内气相占比上升、液位下降，致使冷凝管线内气液界面向蒸发器出口方向回退至气体管线内，蒸发器温度及内部压力大幅上升，热管性能恶化。

In order to explore the relationship between the heat leakage from the evaporator to the compensation chamber, the evolution of vapor and liquid distribution, and the performance of the loop heat pipe (LHP), an experimental system for full visualization was developed. In the experimental device, quartz glass and PFA tubing were used to realize visualization. The changes in the distribution of vapor and liquid in the LHP can be observed and the temperature, pressure and mass flow rate are measured. Experiments were conducted under increasing heat loads (5-10-15-20-25 W ) to analyze the LHP's operational behavior. As the heat load increases, the key parameters, including the liquid level height in the compensation chamber, the vapor-liquid interface position in the condenser, and thermal resistance, were monitored and compared. Heat leakage from the evaporator to the compensation chamber was quantified using experimental data, and visual observations were systematically analyzed. Results shows that with the increase of the heat load, the heat leakage between the evaporator and the compensation chamber intensifies, and a large amount of vapor is produced due to nucleate boiling in the vapor core, resulting in an increase in the vapor proportion in the compensation chamber and a corresponding drop in the liquid level, also the vapor-liquid interface in the condenser retreats into the vapor line. Evaporator temperature and internal pressure rise sharply, and the heat pipe performance deteriorates.