Research On Thermal Design Of Space Radiator And Measurement Of Thermal Properties Of Coating

With the continuous development of science and technology and the continuous improvement of mission requirements,nuclear energy as a spacecraft power system has a wide range of application prospects,but with it comes the space large heat dissipation technology,which puts forward higher requirements for the spacecraft thermal control system.At the same time,high-power space radiators are also one of the key technologies that urgently need to be resolved in the development of aerospace technology.Therefore,this paper conducts research on high-power heat dissipation technology for finned space radiators and foam-type space radiators,and optimizes their weight,structure and other parameters to provide important theoretical support for the application of space high-power heat dissipation technology.First of all,this paper uses the calculation of the heat transfer performance of the finned heat pipe radiation unit and the design of its structural heat transfer parameters,and then connects it in series to form a finned heat pipe radiator,and then designs the heat transfer performance of the finned heat pipe radiator Analyze and optimize the overall design heat transfer performance parameters.At the same time,in view of the decrease in the temperature of the imported coolant after flowing through each radiating unit,the heat transfer performance under a single radiating unit is reduced,this paper proposes a finned heat pipe radiator model with a gradient arrangement for space radiators In,the research results show that the finned heat pipe radiator under the gradient arrangement has better heat transfer structure performance than the finned heat pipe radiator under the uniform arrangement.Secondly,considering that the high-porosity metal foam structure has the advantages of light weight and good radiation performance at high temperatures,this paper adds liquid metal heat pipes to the metal foam to form a foam heat pipe radiator.Regarding the radiation and heat transfer issues involved in the porous metal fo am structure,this article will be equivalent to the radiation and heat conduction coupling problem in a semi-transparent medium.Combining the internal heat transfer parameters of the radiator to calculate the temperature field distribution in the translucent medium.Using the same research ideas as the finned heat pipe radiator,this article first calculates the heat transfer performance of its foam heat pipe radiating unit and optimizes the corresponding structural parameters,and then connects it in series to form a foam heat pipe radiator.Carry out the calculation of heat transfer performance and the optimization of structural parameters.Similarly,due to the problem of the temperature drop of the inlet coolant temperature flowing through the foam heat pipe radiator unit,the corresponding heat transfer performance of the foam heat pipe radiator in the gradient arrangement was studied,and the results showed that the foam heat pipe radiator in the gradient arrangement The model has better performance.Finally,for the calculation and analysis process of the heat transfer performance of the space radiator,the acquisition of the physical properties of the material composition is particularly important.The space radiator relies on radiation in deep space to radiate energy to the deep space.The emissivity on its surface determines the strength of the heat dissipation performance,and scholars have carried out more research.However,scholars ignore that heat transfer parameters can also affect heat dissipation,and it is difficult to obtain the heat transfer parameters of the coating material in the integrated material of the coating and the substrate.Therefore,for the integrated double-layer structure of the coating matrix,in order to test and evaluate the thermal conductivity of the coating material,this paper proposes a method for inversion and identification of the thermal conductivity of the coating material based on the Transient Plane Source(TPS)method.According to the Hot-Disk experimental test principle,a two-dimensional unsteady heat transfer model of the substratecoating-probe is established;combined with the instantaneous temperature rise data information during the measurement process,the particle swarm optimization algorithm is used to inverse and identify the coating material.Thermal conductivity;and the reliability of the above method is demonstrated through experiments and numerical simulations.For the measurement of the thermal conductivity of the surface rough coating formed by spraying,no in-depth research has been carried out at home and abroad.This paper proposes an inverse of the thermal conductivity of the rough surface coating on the basis of the above-mentioned inversion method.Performance identification method.