Evaporative cooling systems for electrified powertrain components

电动动力总成组件的蒸发冷却系统：该项目将满足对轻量化/低成本热管理系统的需求，该系统可与风冷组件（包括驱动/牵引电机）一起使用，以取代电动飞机等对质量敏感的应用中对体积庞大的液体冷却系统的需求。随着社会向低碳运输的转变，高功率密度的电动机现在被广泛使用，对电气化动力系统的需求也将增加，高体积功率密度使得被动空气冷却系统的使用更具挑战性。通常情况下，动力总成装置要么对高功率设置施加短持续时间限制，要么使用液体冷却架构来管理机器的温度。在需要长时间高功率的质量敏感型应用中，这两种解决方案都不可取，但大多数时间都是在许多动力系统典型的较中等功率水平上度过的。在这个项目中，蒸发冷却系统的使用将被研究和开发，重点放在轻型飞机的电动动力系统中的电机上；当单独的气流不足时，该系统将作为电机运行高需求时期的额外冷却形式。使用蒸发冷却系统，在已知的电机热点上进行定向喷雾，将提供一种有针对性的散热方法，为传统的闭环冷却系统提供更轻、更紧凑的替代方案。总之，该项目旨在开发一种方法来解决电机的冷却需求，该方法既能提供液体冷却的高散热性，又能提供空气冷却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.