为了改善碟式太阳能聚光器系统的机械损耗问题，基于蒙特卡洛法，利用Matlab软件编程，设计了一套旋转抛物面镜与旋转双曲面上半支镜结合的二次反射碟式太阳能系统,系统抛物面镜开口直径Dp为6.93 m，边缘角edge为120°，焦距f为1 m，两镜中心点相距0.64 m，抛物面镜挖孔半径R为0.1 m，吸热器半径r为0.05 m。通过蒙特卡洛光线追踪和主副函数结合的方法对二次反射、二次镜尺寸、一二次镜相对位置和吸热器角度的模拟结果进行分析。

In order to solve the problem that dish solar concentrator system has mechanical loss at high temperature,based on Monte Carlo method and Matlab software programming,a set of secondary reflective dish solar energy system combining a rotating parabolic mirror and a rotating hyperboloid upper half mirror is designed.The parabolic mirror opening diameter Dp is 6.93 m,edge angle is 120°,focal length f is 1 m,the center points of the two mirrors are 0.64 m apart,the aperture radius of the parabolic mirror R is 0.1 m,and the radius of the heat sink r is 0.05 m.Through a method of combining Monte Carlo ray tracing and main and subfunctions,the simulation results of the secondary reflection,the size of the secondary mirror,the relative position of the primary and secondary mirrors and the angle of the heat sink are analyzed.The analysis result shows that the average secondary local concentration ratio of the system is 3.6×104,and the secondary concentration efficiency is 93.4%.It is concluded that the main factor affecting the secondary concentration ratio is the relative position of two mirrors.

TK514

国家自然科学基金（51736006）