小尺寸稀疏镜场能流密度分布模拟研究

Simulation Study on Energy Flux Density Distribution in Small Sparse Mirror Field

基于接收面的光斑等效法,通过MATLAB软件模拟,提出了一种优化接收器表面能流密度分布计算时间的方法,分析单台定日镜和定日镜场的光斑能流密度分布规律。通过研究光斑边缘的能流密度与光斑中心能流密度的比值来分析小尺寸定日镜形成光斑的均匀性。结果表明:提出的计算方法不需要直接算出接收面网格点所有能流密度,对比蒙特卡洛法可缩短68.47%的计算时间;上午随着太阳从东升起,光斑能量主要集中在接收面的中偏右区域;下午随着太阳向西落下,光斑能量主要集中在接收面中偏左区域;采用小尺寸定日镜得到比大型定日镜更加均匀的光斑,在夏至日正午12点时,能流密度均匀性比值可以达到0.238。

Based on the spot equivalent method of the receiving surface,a method to optimize the calculation time of the energy flux density distribution on the receiver surface was proposed through MATLAB software simulation,and the spot energy flux density distribution rule of a single heliostat and heliostat field was analyzed.The ratio of the energy flux density at the edge of the light spot to the energy flux density at the center of the light spot was studied to analyze the uniformity of the light spot formed by the small-size heliostat.The results show that the calculation method proposed in this paper does not need to directly calculate all energy flux densities at the grid points of the receiving surface,and the calculation time can be reduced by 68.47%compared with the Monte Carlo method.In the morning,as the sun rises from the east,the spot energy is mainly concentrated in the center right area of the receiving surface;in the afternoon,as the sun sets to the west,the spot energy is mainly concentrated in the center left area of the receiving surface.Using the small-size heliostat can obtain a more uniform light spot than the large heliostat.At 12 o′clock of noon on the summer solstice,the uniformity ratio of the energy flux density can reach 0.238.