Feasibility analysis and prospects of supercritical CO2 Brayton cycle application in high-speed flight vehicles
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.
supercritical CO2power cyclethermal managementhigh-speed flight vehiclesfeasibili-ty analysisheat transfer characteristics
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