Research On Heating Energy Storage Materials And Structure Of Aircraft Internal Components

With the rapid development of aerospace technology,the thermal load of aircraft is increasing day by day,and the speed of the vehicle increases and the power of the components inscreases,which poses a more stringent challenge to the thermal management system of aircraft.The phase change material can store a large amount of heat during the solid-liquid conversion,so that the aerodynamic heat generated by the external high-speed flight of the aircraft and the heat accumulated by the internal components of the vehicle can be quickly transferred and stored.Adding nanoparticles to the phase change materials and filling them into the foam carbon skeleton can greatly improve the thermal conductivity and enhance the energy storage efficiency of the phase change materials.Through the melting process and simulated thermal conductivity calculation of the modified phase change materials,the heat transfer enhancement effect of nanoparticles and foam carbon skeleton on the phase change materials can be seen from the microstructure,which is of great guiding significance to the design of the phase change composite energy storage system.Firstly,the heat transfer properties of nanoparticle-enhanced phase change materials were analyzed and simulated by ANSYS software.The two-dimensional nanoparticle enhanced phase change material model was established by using the designmodeler module,and the melting process numerical simulation and equivalent thermal conductivity calculation of different nanoparticles were conducted by using the FLUENT software.The results show that the graphene-enhanced phase transition materials have the highest thermal conductivity.The thermal conductivity of the enhanced phase transition material increases with the nanoparticle mass fraction below 5%.When the mass score is higher than 5%,the graphene and carbon nanotube particles will have an agglomeration effect,reducing the thermal conductivity of the enhanced phase change materials.Secondly,COMSOL software is used to establish a foamed carbon skeleton model and calculate the equivalent thermal conductivity of foamed carbon with different porosity and different pore sizes.The melting process simulation and thermal conductivity are calculated for the enhanced phase change filling composite energy storage material.The results show that the equivalent thermal conductivity of phase change composite energy storage material increases and then decreases with the porosity of foam carbon framework.However,the aperture change of foam carbon skeleton has little effect on the thermal conductivity of composite materials..Finally,the thermal effect analysis and calculation of thermal conductivity of graphene,SiO2 and carbon nanotube nanoparticles under different working conditions.The composite energy storage materials filled with graphene-modified phase change materials can be quickly transferred and stored in heat,with a low average temperature,and have a good peak elimination effect.Under the actual working conditions,the thermal conductivity of graphene phase change filling composite energy storage materials with different cross-sectional areas and different thicknesses is calculated,and the thermal effect is analyzed.It shows that the size of 10cm*10cm*1.5cm composite energy storage material is most suitable for the actual working conditions when economic factors are taken into account.