提出了一种外域包络和网格识别的光线追踪离散方法。将镜面单元安装误差等效为刚体的空间旋转运动, 基于光线追踪法推导了引入安装误差后的镜面反射聚光模型, 同时结合镜面面型误差以及跟踪误差等影响因素, 建立了更为全面的聚焦能流分布数学模型。编制了Matlab程序, 在验证数学模型正确性的基础上, 以25kW聚光器为对象分析了结构特征及尺寸、镜面单元安装误差等对焦平面能流分布的影响。结果表明, 镜面单元安装误差对聚焦能流密度峰值及分布特征影响显著, 而结构特征及尺寸对其影响较弱, 可适当增大透风间隙来改善抗风性能。所建立的数学模型能为聚光器镜面单元安装以及吸热器匹配设计等提供参考。

A method of outland envelope and identification of the grid is put forward in the ray tracing area. The mirror unit installation error is thought of equivalent for rigid body rotation movement in the space.Based on ray tracing method, the mirror condenser model which introducing the installation error is deduced. At the sometime, a comprehensive mathematical model about flux distribution is built,which including the surface error ,tracking error and other factors.Matlab calculation procedures are compiled on the basis of verifying the correctness of the mathematical model.To put 25kW concentrator as the research object, the influence of the structural features,installation error and other factors on the flux distribution is analyzed. The results show that the impact of the distribution and the density peak of energy flow by the mirror unit installation error is outstanding , the influence of structure features and the size is weaker. The drafty gap can be appropriately increased to improve the resistance of the wind. The calculation results present a reference for the assemblage of the solar collect and optimal design of heat absorber.