针对线性菲涅尔反射式（LFR）聚光集热系统镜面积尘所引起的光学损失问题,建立镜面积尘的系统三维模型,利用蒙特卡洛光线追迹法进行光学仿真模拟,研究灰尘颗粒形状、粒径以及镜面积尘密度对光线路径、系统能流密度和聚光效率的影响,并利用LFR能流密度测试系统来验证仿真模拟方法的可靠性。结果表明,球体颗粒对光线有汇聚作用,入射至正方体颗粒的光线会被完全吸收,镜面积尘密度增加1 g/m2,吸热管周的平均能流密度降低625.17 W/m2,系统的聚光效率下降5.53%,且镜面积尘颗粒的粒径越小,吸热管周的能流密度下降越严重,不同积尘密度下仿真模拟与试验测试的能流密度变化趋势一致,两者之间误差为9.6%。
Abstract
Aiming at the problem of light loss caused by mirror dust accumulation in LFR system, a three-dimensional model of mirror dust accumulation is established, and the optical simulation is carried out by Monte Carlo ray tracing method. The influence of dust particle shape, particle size and dust density on light path, energy flux density and concentrating efficiency is studied. The reliability of the simulation method is verified by LFR energy flux density test results. The results show that： Spherical particles have a convergence effect on the light, and the light incident to the square particles will be absorbed completely. When the dust density of mirror increases by 1 g/m2, the average energy flux density around the collector tube will decrease by 625.17 W/m2, and the concentrating efficiency of the system will decrease by 5.53%. Moreover, the smaller the particle size of the dust particles on the mirror, the greater the energy flux density around the collector tube decreases. The variation trend of the energy flux density under different dust densities from optical simulation and experimental test is consistent, and the error between them is 9.6%.
关键词
太阳能聚光器 /
镜面 /
灰尘 /
光学设计 /
CCD相机 /
LFR聚光系统
Key words
solar concentrators /
mirror dust /
optical design /
CCD cameras /
LFR concentrating system
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基金
国家自然科学基金（51766012）; 内蒙古自治区高等学校科学研究项目（NJZY21322）; 内蒙古科技重大专项（2021ZD0030）; 内蒙古工业大学科学研究项目（ZZ202019）
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