Analysis Of Thermoelectric Effects And Thermoelectric Materials Of Aircraft

Thermoelectric material is a functional material capable of thermoelectric conversion and has broad application prospects in the energy field.In this paper,the aerodynamic heat generated by the aircraft during flight is taken as the research background,and the aerodynamic heat is utilized by the thermoelectric conversion technology.On the one hand,the heat can be quickly transferred to prevent damage to the structure of the aircraft,and on the other hand,it can provide power protection for long-time flight of the aircraft.In this paper,the thermophysical field is coupled with the electrophysical field using the basic theory of thermoelectric effect.The expressions of thermoelectric conversion output power and conversion efficiency are derived,and the steady-state and transient control equations of thermoelectric coupling are deduced according to the finite element method.According to the flight Ma=3,the determined working temperature of the thermoelectric material,the skutterudite was selected as the thermoelectric material in the simulation.The output voltage,output power,and energy conversion efficiency are calculated by steady state and transient simulation of the thermoelectric sheet.A composite phase change energy storage material-thermoelectric device structure is proposed,which can form a constant temperature difference at both ends of the thermoelectric power generation chip,so that the thermoelectric power generation chip can output a stable voltage.The construction of the composite phase change energy storage material-thermoelectric device system experimental platform was completed,and the relationship between assembly pressure,load resistance and loop current on output voltage,output power and conversion efficiency was obtained through experiments.For the subsequent simulation,the load parameters were obtained.The effects of different temperature differences and different temperature intervals on the output voltage,output power and conversion efficiency of the thermoelectric power generation chip were studied by simulation.When the flight Ma=3,there is a large temperature difference between the aircraft cabin and the cabin,but the single thermoelectric material has the problem of low conversion efficiency and narrow temperature.Therefore,a multi-stage segmented thermoelectric device composed of Bi₂Te₃ and skutterudite was designed.Through the simulation,the relationship between the loop current of the single-stage thermoelectric device and the multi-stage segmented thermoelectric device and its output voltage,output power and conversion efficiency under the same temperature difference is compared.Then the structure optimization of the multi-stage segmented thermoelectric device is carried out.