Design Of Thermal Superstructure Materials Based On Neutral Inclusion

Heat is closely related to human production and life.The control of heat transfer path can not only provide thermal protection means,but also improve the utilization rate of heat energy.In this paper,with the aim of regulating heat flow,based on the existing research,from the structure,design method and heat transfer mode of heat flow regulating device,the design of different thermal functional types of superstructural materials.There are many ways to design thermal functional devices.In this paper,the idea of meso-mechanical neutral inclusion and coordinate transformation method are used to study thermal functional superstructures.As one of the important functional devices of heat flow control device,thermal cloaking device can provide important guarantee for human production and life and military field.In the existing structures of thermal cloaking devices,most thermal cloaking devices only have a single cloaking chamber,which has certain limitations for practical application.In this paper,based on the idea of neutral inclusion,the formula and design method of the multi-chamber thermal cloaking device are given,and the reliability of the multi-chamber thermal cloaking device is proved by numerical simulation and experiment.The influence of the number,location and arrangement of invisible chamber on invisible performance is analyzed,and corresponding conclusions are given.Thermal function device can achieve similar thermal response based on different design theories,and each design method has advantages and disadvantages.The thermal function device designed by coordinate transformation method has the characteristics of non-uniform anisotropy,and the physical properties of materials required by neutral inclusion design are uniform isotropy,both of which can achieve good invisible effect.In this study,an equivalent method based on neutral inclusion is proposed,which is combined with coordinate transformation method to produce thermal devices with different functions.The results of the design parameters of the thermal function device by the coordinate transformation method were taken as the input values of the neutral inclusion design parameters.The size of the cell corresponding to the thermal conductivity was inversely derived,and the corresponding cell was arranged in different ways in the isotropic material to form the equivalent anisotropic material,so as to realize the purpose of regulating the heat transfer path by combining the coordinate transformation method with the neutral inclusion idea.Compound heat transfer exists widely in natural thermal environment.In this paper,a composite heat transfer model is constructed based on the heat conduction-heat radiation thermal transfer mode to compare the heat transfer performance of heat conduction and heat radiation,and a corresponding composite heat transfer model is constructed.By adjusting the heat transfer performance of heat conduction,the composite heat transfer performance can be strengthened or weakened.A thermal invisible cloak under composite heat transfer is constructed,which can realize the invisible function in the conduction-radiation transmission mode.Finite element simulation and data analysis are used to verify the effectiveness of the model.