线性菲涅耳反射聚光器聚焦光斑能流密度分布的计算

Calculation of Flux Density Distribution on Focal Plane in Linear Fresnel Reflector

利用光线追迹的方法,考虑太阳形状、余弦损失、阴影及遮挡损失的影响,建立线性菲涅耳反射(LFR)聚光器的三维光学几何模型,给出其光斑能流密度分布的计算式,采用Matlab软件编程实现该算法。将计算结果与美国国家可再生能源实验室(NREL)开发的SolTrace软件仿真结果相对比,光斑能流密度分布曲线基本吻合,证明了该算法的正确性。为了获得更高的镜场聚光效率,对比了不同反射镜面型对LFR聚光器的影响。

The spot flux-density distribution on the focal plane of linear Fresnel reflecting （LFR） concentrators is calculated with Matlab program by the ray-tracing method, with the shape of the sun, cosine loss, shading and blocking loss, taken into account in the process. Three-dimensional optical geometric model is established and the spot flux-density distribution is calculated with Matlab program. The model is demonstrated and justified by comparing simulation results of this Matlab program with that of SolTrace software developed by the U.S. National Renewable Energy Laboratory （NREL）. The effects of different mirror shapes for LFR are also compared in order to obtain the higher efficiency of concentrator field.