Influence Of Solar Simulator Parameters On Distribution Of Radiation Intensity In The Desert Environment Simulation

In this article, the desert environment simulation laboratory was taken as the object. The numerical simulation method and physical experiment method were used to investigate the influence of the parameter of the solar simulator to the distribution of radiation intensity on the sand floor in the laboratory.The numerical simulation was carried out with the commercial computational fluid dynamics software, and the dynamic mesh model and the Realizable k-εmodel was used. In order to reduce dynamic nodes and accelerate iterative rate, the simulated region was divided to that of dynamic mesh and of static mesh. According to the velocity of the solar simulator, the UDF was redacted to specify the moving of the nodes in the region of dynamic mesh. And the cells were updated by the scheme of dynamic layering. During the regular moving of the solar simulator, the distribution of solar radiation on the sand surface was computed under the situations in which different groups of the lamp-house were turned on. Also, the physical experiment was carried on in typical conditions, and the solar radiation value of sand floor in simulated region was measured. The results of experiment were compared with the ones of the simulation.From the results of the simulation and the experiment which were in good agreement, it is shown that the DO model and the in scheme of dynamic layering was feasible to the radiation simulation of the laboratory. In the simulation with four groups of the lamp-house were turned on, the ununiformity of radiation on the sand surface descended straight from 9.57% to 6.62% during the alighting process of the solor simulator, and rised from 6.62% to 9.68% during the raising process. Other simulation instances had simple law. But the less the number of groups was tured on, the larger the ununiformity of radiation on the sand surface was. With the same height of the solar radiator in the instances of simple group of lamp-house was turned on, the ununiformity of radiation on the sand surface in the model experiment region was the largest. And the ununiformity of radiation in the the instance of group C was larger, with the altitude in the the instance of group C was the smallest. So it would be found that not only the radiation intensity was larger in the situation of more lamp-house were turned on or the situation of the height of the solar radiator was lower, but also the ununiformity of radiation on the sand surface was less, which means the distribution of radiation intensity was more uniformity. Also the he results of the simulation and the experiment showed that the radiation effect on the sand floor could be superposable, and the radiation intensity on the sand surface was nonlinear to the altitude of the height of the solar radiator.