Study On Passive Thermal Control Of Lunar Surface Load Model

With the development of the world’s space industry,deep space exploration technology continues to progress.As the first step towards deep space exploration,lunar exploration mission has important research value and significance.As an engineering or scientific test piece for lunar payload,the internal equipment and instruments of lunar payload have certain requirements for temperature.In order to meet the temperature requirements of each load system,it is necessary to design and layout the thermal control scheme of the load reasonably.The thermal control system of spacecraft consists of passive thermal control and active thermal control.Based on the passive thermal control system of lunar load model,the passive thermal control design scheme of lunar load model in lunar working section is studied.Through ground experiment and numerical simulation,the influence of thermal control coating and multilayer insulation module on passive thermal control of lunar load model is studied,and a suitable passive thermal control scheme is designed.The ground simulation experiment platform of lunar load model was established to carry out the test under the condition of no protection and thermal insulation.The physical model of the same size as the ground model experiment is established by using the pre-processing software Thermal Desktop,and the solver software S SINDA/FLUINT is used for numerical simulation.Compared with the experimental results,the reliability and feasibility of the numerical simulation are verified.Through the numerical simulation software,the actual lunar working model of lunar load model is established.Two passive thermal control methods of thermal control coating and multi-layer thermal insulation module are simulated respectively.The effects of solar absorptivity,infrared emissivity,thickness of multi-layer thermal insulation module and equivalent thermal conductivity on passive thermal control of lunar load model are studied,and the optimal range of thermal control coating and multi-layer thermal insulation module is proposed.On this basis,five kinds of passive thermal control schemes are designed according to the commonly used passive thermal control materials in aerospace engineering.The thermal control effects of five thermal control schemes are compared and analyzed by numerical simulation,and the optimal passive thermal control scheme suitable for lunar load model is proposed.The energy efficiency analysis shows that the energy efficiency improvement rate of the optimal scheme is 97.06% compared with that without protective measures.The results of this paper can provide theoretical basis and application reference for passive thermal control design of lunar loads.