According to recent aircraft engine development trends, the performance enhancement of the propulsion plants is accompanied by both an increase of the overall pressure ratio and a decrease of the fan pressure ratio. Projections for the next decade show that equipment within the engine compartments can exceed their temperature thresholds, penalizing aircraft safety. Loop heat pipes (LHP) represent a highly appealing solution that could be employed as part of future passive cooling architectures, either replacing or enhancing the heat transfer capabilities of currently adopted monophase solutions. To meet the compatibility, safety, and environmental constraints, a titanium–water LHP was designed, manufactured, and tested for the thermal management of aircraft engine equipment. The results encouraged the use of this technology, providing clues for the development of other prototypes. The sintered titanium wick showed an excellent mechanical resistance to repeated cycles of water freeze/thaw, providing that the LHP could be potentially exposed to a cold environment with limited risk to undergo structural failures. Experimental data suggest that a passivation process occurred in the first hours of operation, modifying wick wettability and improving LHP performance. This was accompanied by the generation of noncondensable gas. The impact on LHP behavior was carefully analyzed, together with the influence of heat transfer on the liquid line and the cold source temperature variations.

根据最近的飞机发动机发展趋势，推进装置的性能提高伴随着总压力比的增加和风扇压力比的降低。未来十年的预测表明，发动机舱内的设备可能会超过其温度阈值，从而损害飞机安全。回路热管（LHP）代表了一种极具吸引力的解决方案，可以用作未来的被动冷却架构的一部分，以替代或增强当前采用的单相解决方案的传热能力。为了满足兼容性，安全性和环境方面的限制，设计，制造并测试了钛水LHP用于飞机发动机设备的热管理。结果鼓励了这项技术的使用，为其他原型的开发提供线索。烧结钛灯芯对水的反复冻结/融化循环表现出出色的机械抵抗力，条件是LHP可能会暴露于寒冷环境中，遭受结构破坏的风险有限。实验数据表明，钝化过程发生在操作的最初几个小时，从而改变了灯芯的润湿性并改善了LHP性能。这伴随着不凝气体的产生。仔细分析了对LHP行为的影响，以及传热对液体管线和冷源温度变化的影响。前提是LHP可能会暴露于寒冷环境中，遭受结构性破坏的风险有限。实验数据表明，钝化过程发生在操作的最初几个小时，从而改变了灯芯的润湿性并改善了LHP性能。这伴随着不凝气体的产生。仔细分析了对LHP行为的影响，以及传热对液体管线和冷源温度变化的影响。前提是LHP可能会暴露于寒冷环境中，遭受结构性破坏的风险有限。实验数据表明，钝化过程发生在操作的最初几个小时，从而改变了灯芯的润湿性并改善了LHP性能。这伴随着不凝气体的产生。仔细分析了对LHP行为的影响，以及传热对液体管线和冷源温度变化的影响。