Abstract

The realization of a high heat flux removal with a flat loop heat pipe at ambient temperature is of great importance for achieving thermal control within spacecraft electronic equipment. In this article, a flat bifacial evaporator loop heat pipe with two flat thermo-contact surfaces has been proposed, fabricated, and investigated. The shell of the flat evaporator was made of stainless steel, and ammonia was selected as the working fluid. The startup and operating characteristics of the single side, both sides, and switching working modes were analyzed, as well as the influence of heat consumption, orientation, wind speed, and environmental temperature. The experimental studies indicated that this novel loop heat pipe can start up and run successfully under different working modes, and that the heat dissipation capacity of a set of loop heat pipes can reach 250 W at room temperature. Based on this, a light-weight and small electronic device has been developed using a multi-functional (efficient ‘heat collection-heat dissipation-structural support’) flat bifacial loop heat pipe to realize a kilowatt level heat dissipation capacity. This work can provide reference for the future design of high heat flux, light-weight, and small payload for use in spacecraft.

摘要

在环境温度下使用扁平回路热管实现高热通量去除对于实现航天器电子设备内的热控制非常重要。在本文中，提出、制造和研究了一种具有两个平面热接触表面的平面双面蒸发器回路热管。平板蒸发器的外壳由不锈钢制成，工作流体选择氨。分析了单侧、双侧和切换工作模式的启动和运行特性，以及热耗、方位、风速和环境温度的影响。实验研究表明，这种新型回路热管在不同工作模式下都能成功启动和运行，并且一套回路热管的散热能力在室温下可以达到250W。在此基础上，利用多功能（高效“集热-散热-结构支撑”）扁平双面环形热管，实现千瓦级散热能力，开发了一种轻量化、小型化的电子设备。该工作可为未来航天器高热通量、轻量化、小载荷的设计提供参考。