消除复合抛物面聚光器二次反射的设计研究

A New Design Method for Compound Parabolic Concentrators by Eliminating the Secondary Reflection

建立未截短的原复合抛物面聚光器（CPC）、1／2截短CPC以及消除二次反射设计CPC的数学模型，根据光线追踪法和蒙特卡罗法，在几何聚光比为2～10内，计算CPC高度与出射光孔宽度的比值，并依据该比值分析CPC的经济性，计算CPC最佳均匀面上的非均匀度和最大辐照度，进而分析CPC聚光均匀性．结果表明：在相同几何聚光比下，消除二次反射设计CPC的经济性和聚光均匀性最好．

Mathematic models were set up for the compound parabolic concentrator （CPC）, respectively without truncation, with half light truncation and with elimination of secondary reflection. According to ray tracing method and Monte Carlo method, and for the geometric concentrating ratio in the range of 2 to 10, the aspect ratio of CPC depth to outlet aperture width was calculated, and subsequently the CPC econ- omy was analyzed, following which both the non-uniformity of concentrated light and the maximum irradi- ance on the best uniform surface were computed, so as to study the uniformity of the CPC. Results show that for the same geometric concentrating ratio, the newly designed CPC with elimination of secondary re- flection has the best economy and the highest uniformity of concentrated light among all the three types of CPCs mentioned above.