| In order to meet the needs of free round-trip space and multitask flight of hypersonic vehicle,a new thermal cycle propulsion technology scheme is proposed based on the existing propulsion system,the thermoelectric materials are introduced into the wall of the engine tail nozzle and the front of the aircraft,the residual heat at the tail nozzle of the engine and the aerodynamic heat generated during the flight are converted into electrical energy,which is reused in the engine cycle.The main works of this paper could be summarized as follows:(1)This paper introduces the design of two kinds of thermoelectric combined power cycle engines,machine / electric hybrid driving scheme and all electric driving scheme.The performance models of the traditional turbojet engine,the thermoelectric combined power engine and the thermoelectric conversion system are established respectively,and the effects of the various parameters of the thermoelectric materials on the performance of the combined power engine are analyzed.The parameters of the design node of the traditional turbojet engine and the thermoelectric combined power engine are obtained by replacing the flight process parameters into the performance model,and the calculation results are analyzed.(2)On the basis of the existing engine performance model,the influence of the heat transfer process between the gas,air and thermoelectric materials on the performance of the engine is further considered,the performance analysis and calculation of the thermoelectric combined power engine are carried out under the condition of fitting the heat transfer process.(3)The aerodynamic heat of the aircraft during the flight is analyzed.The flight parameters and aerodynamic data of the "Skylon" aircraft during the flight are referred to.The influence factors of the aerodynamic heat flow density are analyzed,and the power balance analysis is carried out in combination with the thermoelectric conversion system.The results show that compared with the traditional engine scheme,the thermoelectric combined power engine has greater specific impact and circulating heat efficiency,but the performance of thermoelectric materials is higher,and the performance of the existing thermoelectric materials can not be achieved. |
