摘要
提出了一种基于相同抛物镜面单元旋转阵列的低成本新型槽式聚光器。采用光线跟踪方法建立了该聚光器的光学分析模型,并详细研究了镜面焦距(f)、镜面宽度、平面接收器位置、旋转阵列半径(R;)和旋转阵列数量(N)等关键参数对其聚光性能的影响规律,为其设计与应用提供了重要依据。研究结果表明:新型槽式聚光器能很好地汇聚太阳光能,并且它不同于传统抛物槽式聚光器将平行光汇聚于某点,而是有所“分散”地进行汇聚,具备实现平面接收器上均匀聚焦能流分布的潜力;聚焦光斑的合理接收位置会随旋转阵列半径的改变而变化,通常接收器位于旋转阵列半径的一半位置是合适的,但要获得最小聚焦光斑则需将其下移150~200 mm;聚焦光斑宽度随镜面编号呈指数增大关系,特别是当镜面宽度较大且旋转阵列半径较小时;旋转阵列半径越大或镜面宽度越小,聚焦能流分布越集中且峰值聚光比越大(算例中已达到50),此时聚焦能流基本呈高斯分布特征。此外,采用较小旋转阵列半径可降低接收器的安装高度并改善能流均匀性。在算例中,当f=8000 mm、R;=4000 mm、N=5且接收器位于1830 mm位置时,聚焦光斑能量分布非常均匀,大部分区域聚光比稳定在7.3,此时的聚光器非常适用于聚光光伏/光热应用领域。
A novel low-cost trough concentrator based on the same parabolic mirror unit rotating array is proposed. The optical analysis model of the concentrator is established by ray tracing method, and the influence of key parameters such as mirror focal length(f), mirror width, position of plane receiver, radius of rotating array(R_(1)) and number of rotating arraies(N) on its concentrating performance is studied in detail, which provides an important basis for the design and application of this concentrator. The results show that the novel trough concentrator can concentrate solar energy well, and it is different from the traditional parabolic trough concentrator, which concentrates parallel light at a certain point, but concentrates light “dispersedly”, and it has the potential to realize uniform focusing energy flux distribution on the plane receiver. The reasonable receiving position of the focusing spot will change with the change of radius of the rotating array. Generally, it is appropriate for the receiver to be located at half of the radius of the rotating array, but to obtain the minimum focusing spot, it needs to be moved down by 150--200 mm. The width of focusing spot increases exponentially with the mirror number, especially when the mirror width is large and the mirror rotating array radius is small. The larger the radius of rotating array or the smaller the mirror width is, the more concentrated the focusing energy flux distribution is and the larger the peak concentrator ratio is(50 in the calculated example). In this case, the focusing energy flux basically shows the characteristic of Gaussian distribution. In addition, the installation height of the receiver can be reduced and the energy flux uniformity can be improved by using a smaller radius of rotating array. In an calculated example, when f=8000 mm, R;=4000 mm, N=5 and the receiver is located at 1830 mm, the energy distribution of focusing spot is very uniform and the concentration ratio in most areas is stable at 7.3, the concentrator is very
作者
颜健
田勇
刘永祥
彭佑多
Yan Jian;Tian Yong;Liu Yongxiang;Peng Youduo(School of Mechanical Engineering,Hunan University of Science ayid Technology,Xiangtan,Hunan 411201,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2022年第5期179-188,共10页
Acta Optica Sinica
基金
国家自然科学基金(52105097)
湖南省自然科学基金(2020JJ5189)
湖南省教育厅项目(19C0794)。
关键词
光学设计
抛物镜面
新型太阳能槽式聚光器
均匀能流分布
光学性能
光线跟踪方法
optical design
parabolic mirror
novel solar trough concentrator
uniform energy flux distribution
optical performance
ray tracing method
