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Transient Thermal Analyses of Passive Systems on SCEPTOR X-57

机译：SCEPTOR X-57上的无源系统的瞬态热分析

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摘要

As efficiency, emissions, and noise become increasingly prominent considerations in aircraft design, turning to an electric propulsion system is a desirable solution. Achieving the intended benefits of distributed electric propulsion (DEP) requires thermally demanding high power systems, presenting a different set of challenges compared to traditional aircraft propulsion. The embedded nature of these heat sources often preclude the use of traditional thermal management systems in order to maximize performance, with less opportunity to exhaust waste heat to the surrounding environment. This paper summarizes the thermal analyses of X-57 vehicle subsystems that don't employ externally air-cooled heat sinks. The high-power battery, wires, high-lift motors, and aircraft outer surface are subjected to heat loads with stringent thermal constraints. The temperature of these components are tracked transiently, since they never reach a steady-state equilibrium. Through analysis and testing, this report demonstrates that properly characterizing the material properties is key to accurately modeling peak temperature of these systems, with less concern for spatial thermal gradients. Experimentally validated results show the thermal profile of these systems can be sufficiently estimated using reduced order approximations.
机译：随着效率，排放和噪声成为飞机设计中越来越重要的考虑因素，转向电动推进系统是一种理想的解决方案。要实现分布式电动推进（DEP）的预期好处，需要对热量有严格要求的高功率系统，与传统的飞机推进相比，提出了一系列不同的挑战。这些热源的嵌入式特性通常会阻止使用传统的热管理系统，以使性能最大化，同时将废热排放到周围环境的机会更少。本文总结了不使用外部风冷散热器的X-57车辆子系统的热分析。大功率电池，电线，高升力电动机和飞机外表面要承受严格的热约束下的热负荷。由于它们从未达到稳态平衡，因此会瞬时跟踪这些组件的温度。通过分析和测试，该报告表明正确表征材料特性是准确建模这些系统的峰值温度的关键，而对空间热梯度的关注则较少。实验验证的结果表明，使用降阶近似可以充分估计这些系统的热分布。

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