The thermal environment of high-speed flight vehicles during flight is relatively harsh due to their high flight speed and the coupled influence of multiple factors such as aerodynamic heating,internal equipment heat dissipation,and propulsion system heat dissipation.The thermal management challenges of high-speed flight vehicles in detail according to the characteristics of high-speed flight are analyzed,and the demand for the conversion between heat,shaft work and electrical energy of high-speed vehicles are discussed.The advantages of the supercritical CO2 Brayton cycle and the heat transfer characteristics of supercritical CO2 are introduced.It is concluded that the supercritical CO2 Brayton cycle,which is characterized by high thermodynamic efficiency,compactness of the system and safety of the working fluid,is relatively suitable for the thermal management of high-speed flight vehicles,and the directions of future researches that need to be focused on are further discussed.In the future,it is possible to consider the requirements of propulsion,thermal protection and thermal management,power supply,and other aspects,as well as the impact of the flight environment,to design and optimize the cycle system.The feasibility of this cycle can thus be further improved,while enhancing multi-system collaborative optimization and cooperative operation.
关键词
超临界CO2/动力循环/热管理/高速飞行器/可行性分析/换热特性
Key words
supercritical CO2/power cycle/thermal management/high-speed flight vehicles/feasibili-ty analysis/heat transfer characteristics
万方数据