线性菲涅耳聚光系统柱面反射镜的优化与聚光特性  

Optimization and Concentration Characteristics of Cylindrical Mirrors inLinear Fresnel Reflectors

作　　者：马军[1,2,3] 刘潮 刘芳 庞如帅 王熔基 王成龙 Ma Jun;Liu Chao;Liu Fang;Pang Rushuai;Wang Rongji;Wang Chenglong(National Engineering Research Center for Technology and Equipment of Environmental Deposition,Lanzhou Jiaotong University,Lanzhou 730070,Gansu,China;Collaborative Innovation Center for Technology and Equipment of Concentrated Solar Power Co-Constructed by Ministry and Province,Lanzhou Jiaotong University,Lanzhou 730070,Gansu,China;Solar Thermal Industry Research Institute of Gansu Province,Lanzhou 7300700,Gansu,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,甘肃兰州730070 [2]兰州交通大学聚光太阳热能产业关键技术与装备省部共建协同创新中心,甘肃兰州730070 [3]甘肃省太阳能光热产业研究院,甘肃兰州730070

出　　处：《光学学报》2024年第3期209-216,共8页Acta Optica Sinica

基　　金：国家自然科学基金(52066010);甘肃省自然科学基金(22JR5RA351)。

摘　　要：线性菲涅耳聚光系统采用柱面反射镜可提高聚光能力。本文提出一种柱面反射镜曲率半径的优化计算方法,建立了通用计算模型,详细分析了反射光线横向偏移的变化规律、系统瞬时光学效率和能流均匀性等。研究结果表明,柱面反射镜的最佳曲率半径与其宽度几乎没有关联,只需要考虑其与镜场中心的距离和系统有效工作时太阳横向入射角即可得到最佳值。通用计算模型所得的结果与数值精确计算的结果非常接近,最大偏差为1.26%,平均偏差为0.38%。在考虑柱面反射镜型面误差、跟踪误差和曲率半径误差的情况下,当横向入射角大于45°时,系统瞬时光学效率保持在59.46%以上。在聚焦平面的较小范围(相对距离为-0.05~0.05)内,能流密度高且均匀性较好,适合布置光伏电池组件。Objective Linear Fresnel reflectors(LFRs)have gained increasing attention due to their advantages of simplified construction,reduced wind loads,cost-effectiveness,and optimal land area utilization.Mirrors are the focusing components of LFRs,including flat,parabolic,and cylindrical shapes.Flat mirrors have limited focusing ability,with a reflected light spot width not smaller than its width.The use of slightly curved cylindrical or parabolic mirrors can improve the focusing ability.Existing research on the optimization of cylindrical mirrors in LFRs is mostly limited to unaltered curvature radii.Although the production is simple and cost-effective,the individual optimization of the curvature of each mirror(half mirror field)can improve the optical performance of the system more effectively.We aim to investigate the optimization design problem of cylindrical mirrors in LFRs and propose an optimized calculation method for the curvature radius of cylindrical mirrors.A general calculation model is established,which only requires considering its distance from the center of the field and the transversal incidence angle of the sun during effective sunrise to obtain the optimal value.Methods Firstly,based on the characteristic that the reflected rays passing through the two endpoints of the cylindrical mirror of LFRs always deviate towards the direction closer to the center when the mirror deviates from the reference position,an optimized calculation method for the curvature radius of cylindrical mirrors is proposed,and the calculation formula is derived.Secondly,using the method of polynomial surface fitting,the curvature radii calculated for cylindrical mirrors at different widths,distances from the center of the field,and the transversal incidence angles of the sun during effective sunrise are processed to obtain a general calculation model.The accuracy of the model is validated using numerically precise calculation results.Finally,the optical performance of the optimized cylindrical mirrors is analyzed using a ray tra

关 键 词：光学设计 线性菲涅耳 柱面反射镜 光学性能 能流分布 

分 类 号：TK513[动力工程及工程热物理—热能工程]