Evaporative cooling systems for electrified powertrain components

用于电气化动力系统部件的蒸发冷却系统：该项目将满足对轻质/低成本热管理系统的需求，该系统可与包括驱动/牵引电机在内的风冷组件一起使用，以取代大规模使用的笨重液体冷却系统。高功率密度电动机现在已广泛使用，对电气化动力系统的需求将进一步增加，随着社会转向低碳运输，高体积功率密度使得使用被动空气冷却系统更具挑战性。通常，动力系统装置要么施加短持续时间限制，其中可以利用高功率设置，要么使用液体冷却架构来管理机器的温度。这两种解决方案都不是质量敏感的应用中所希望的，在这些应用中，需要长时间的高功率，但是大部分时间花费在许多动力系统的典型的更中等的功率水平上。当单独的气流不足时，该系统将在电动机运行的高需求周期中用作附加形式的冷却。使用蒸发冷却系统，直接喷射到已知的电机热点上，将提供一种有针对性的散热方法，为传统的闭环冷却剂系统提供更轻、更紧凑的替代方案。总之，该项目旨在开发一种方法来满足电机的冷却需求，该方法提供基于液体冷却的高散热性，同时具有基于空气系统的简单性和重量优势。

Evaporative cooling systems for electrified powertrain components: This project will address the need for a lightweight/low-cost thermal management system that can be used alongside air-cooled components including drive/traction motors to replace the requirement for bulky liquid cooling systems in mass-sensitive applications including electric aircraft.High power density electric motors now are widespread in use and the demand for electrified powertrains is set to increase as society shifts towards low carbon transport, high volumetric power densities have made using passive air cooling systems more challenging. Typically, powertrain installations either impose a short duration limit where high power settings can be utilised or use a liquid-cooling architecture to manage the machine's temperature. Neither of these solutions is desirable in mass-sensitive applications where prolonged periods of high power are required, but the majority of the time is spent at more moderate power levels typical of many powertrains.In this project, the use of an evaporative cooling system will be investigated and developed, focusing on the motor in a light aircraft's electric powertrain; the system will act as an additional form of cooling in high-demand periods of motor operation when the airflow alone is insufficient. Using an evaporative cooling system with directed spray onto known motor hotspots will provide a targeted heat rejection method that provides a lighter and more compact alternative to a conventional closed-loop coolant system.In summary, the project aims to develop an approach to address the cooling needs of electrical machines that provide the high heat rejection of liquid-based cooling with the simplicity and weight advantages of an air-based system.