Thermal Calculation For A Lunar Rover In The Lunar Day

The lunar rover has to be faced with complex lunar thermal environment during its activity in the lunar day,including solar radiation without atmospheric absorption,high lunar surface temperature and the shadow on the lunar surface.Therefore,the thermal calculation for the lunar rover in the lunar day is crucial to the design of the lunar rover thermal control system.Its thermal control system and the thermal properties of related materials were reviewed in this thesis at first.Using the thermal analysis module of the ANSYS Workbench software,the heat transfer process of the shallow lunar regolith at 26° and 44.1° in the lunar latitude was simulated respectively and the lunar surface temperature curves were therefore obtained.By comparing these with the corresponding measured data,it was revealed that the calculated results can predict the actual lunar surface temperature to a certain extent.On this basis,the thermal model of the lunar rover was established and the heat dissipation of the lunar rover in the lunar day at Sinus Iridum was simulated.The results show that the multilayer insulation wrapped on the lunar rover has a remarkable heat insulation performance.The heat exchange between lunar rover and external environment through the multilayer insulation is less than 3W.Simultaneously,the OSR radiator with low solar absorptivity and high emissivity can reflect the majority of soar flux,and emit enough long wave radiation,so that the working temperature of the lunar rover with a 200 W internal heat flux can keep within 12? to 35? during its day activity,to meet the right range.The temperature of lunar rover was also calculated as the heat load increase or the radiator was polluted by lunar dust in this thesis.And the feasibility of several schemes to enhance the heat dissipation performance were discussed.The results show that the heat dissipation performance will be greatly influenced by the temperature of lunar surface when the radiator surface is located on the back surface of the solar arrays,it is not feasible to meet the need of heat dissipation,especially in low latitudes.Reducing the height of radiator surface fence has minimal effect on heat dissipation performance.However if the angle of the radiator surface fence is outward inclined in a certain degree,the heat dissipation ability will be markedly improved.