基于射线追踪法的线性菲涅尔聚光镜场阴影与遮挡分析  

Analysis on Shading and Blocking of a Linear Fresnel Reflector Based on Ray Tracing Method

作　　者：马军[1] 夏荣斌[1,2] MA Jun;XIA Rong-bin(National Engineering Research Center for Technology and Equipment of Environmental Deposition, Lanzhou Jiaotong University,Lanzhou 730070,China;Changzhou Research Institute,Lanzhou Jiaotong University,Changzhou 213000,Jiangsu,China)

机构地区：[1]兰州交通大学国家绿色镀膜技术与装备工程技术研究中心,兰州730070 [2]兰州交通大学常州研究院,江苏常州213000

出　　处：《兰州交通大学学报》2019年第4期120-124,共5页Journal of Lanzhou Jiaotong University

基　　金：甘肃省高等学校科研项目(2018A-029);兰州交通大学优秀科研团队(201703);兰州交通大学青年科学基金(2016007)

摘　　要：线性菲涅尔式聚光镜场的阴影与遮挡直接影响着系统光学效率,对其进行分析计算至关重要.根据线性菲涅尔式聚光镜场反射镜单轴跟踪的特点,建立平面直角坐标系,推导出任意时刻每列反射镜的坐标方程,利用射线追踪法追踪任意时刻入射至每列反射镜边缘及经边缘反射至接收器的太阳光线,得到阴影与遮挡的长度,根据几何光学推导了由太阳方位角导致的阴影与遮挡未形成区域面积的计算公式,进而得出阴影与遮挡效率.该方法计算量小、执行效率高,可以准确计算线性菲涅尔聚光镜场的阴影与遮挡效率.Shading and blocking is the main element restricting efficiency of a linear Fresnel reflector(LFR)system and it is very important to the analysis and calculation of the system.According to characteristics of single axis tracking of the LFR field,a plane right-angle coordinate system is established,and coordinate equations of reflectors at any time are deduced.Lengths of shading and blocking are obtained by tracking sun rays which fell on the reflectors and reflected the receiver passing through the adjacent reflector endpoints at any time.Based on geometrical optics,the formula for non shading and blocking area caused by solar azimuth is derived,consequently,the shading and blocking efficiency can be calculated.The method has the advantages of small computations and high efficiency,and can accurately calculate the shading and blocking efficiency of the LFR field.

关 键 词：太阳能 线性菲涅尔式 阴影与遮挡 射线追踪法 几何光学 

分 类 号：TK513.4[动力工程及工程热物理—热能工程]