高温热管性能分析与试验

设计并制备了钠工质、高温合金管壳的丝网型高温热管，测试并分析了在辐射和自然对流散热条件下不同加热功率和不同倾角对热管启动特性和稳态工作后等温性能的影响。结果表明，钠高温热管在不同倾角下都可顺利启动，而且随着加热功率的增加，钠高温热管启动时间越短，但倾角对启动时间影响不大。在倒置45°和倒置90°倾角时，在较大功率下热管的蒸发段出现温度激增现象，分析认为是由于丝网吸液芯毛细力不足导致蒸发段出现工质干涸造成的，说明已经达到了热管的毛细极限。

Properties of high-temperature heat pipe and its experimental

High-temperature heat pipe (HTHP) with sodium as medium, superalloy pipe as container wall and silk screen as wick is designed and prepared. The characteristic of start-up and the isotherm capacity after steady working is tested and studied at different heating power and obliquity with the cooling of eradiation and convection. The results show that all of the HTHPs could be started up successfully at different obliquity, and the start-up time is shorter with higher heating power, but the effect of obliquity on the start-up time is small. There is a sharp increase of temperature on the evaporation section at the obliquity of inverted 45° and inverted 90° with a higher heating power. Analysis suggests that it is due to the drying up of the sodium medium on the evaporation section resulting from the insufficient ability of the silk wick's capillary force, which means the capacity of heat transferring has reached the capillary limit.