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抛物槽式系统中汇聚光线在腔体吸收器内的反射次数对黑腔性能有重要影响,为最大限度提升三角腔体吸收器的采光能力,建立与抛物镜面之间的光路方程,分析腔内二次反射临界条件下对应于不同开口角度的最优镜面设计参数。提出有效孔径比率用于衡量反射镜与腔体的匹配性,并针对实验用的聚光系统分别进行计算,结果表明:腔体开口角度为60°时,焦距为1150 mm、孔径为2220 mm的反射镜面有效孔径比率为0.95,而焦距为1000 mm、孔径为3000 mm的反射镜面有效孔径比率仅为0.61。基于Trace Pro模拟分析验证了有效孔径比率可用于衡量腔体安装位置对光学效率的影响程度,在槽式系统设计及优化过程中应给予重视。
In the parabolic trough system, the number of reflections of the convergent light in the cavity absorber has an important influence on the performance of the black cavity. In order to maximize the lighting capability of the absorber in the triangular cavity and establish the optical path equation with the parabolic mirror, Optimal mirror design parameters corresponding to different opening angles under critical condition of secondary reflection. The effective aperture ratio is proposed to measure the matching between mirror and cavity. The experimental results show that the focal length is 1150 mm and the aperture is 2220 mm when the cavity opening angle is 60 ° The effective aperture ratio of the mirror is 0.95 and the focal length is 1000 mm. The effective aperture ratio of the mirror with the aperture of 3000 mm is only 0.61. Based on the Trace Pro simulation analysis, it is verified that the effective aperture ratio can be used to measure the influence of cavity installation position on optical efficiency. Attention should be paid in the design and optimization of trough system.