良好的启动特性是热管可靠运行的必要条件。重力热管启动特性受倾角等因素影响较大。采用55%钾+45%钠配比的钠钾合金热管,实验研究了倾角对其启动特性的影响。得到了倾角为0°,10°,20°,30°,40°及50°时的启动特性,并获得了外壁温分布曲线。结果表明该热管启动特性良好,倾角的增加不仅使冷凝段温度上升更有利于热管的启动。 Good start-up features are a must for reliable heat pipe operation. Gravity heat pipe start-up characteristics are more affected by factors such as inclination. The effect of dip angle on the startup characteristics was experimentally studied by using a sodium-potassium alloy heat pipe with 55% potassium and 45% sodium. The starting characteristics at the angles of 0 °, 10 °, 20 °, 30 °, 40 ° and 50 ° were obtained, and the temperature profile of the outer wall was obtained. The results show that the heat pipe has good start-up characteristics. The increase of the dip angle not only makes the temperature of the condensing section rise, but also facilitates the start-up of the heat pipe.