双轴槽式聚光器焦斑温度场测试与分析研究  

FOCAL SPOT TEMPERATURE FIELD TEST AND ANALYSIS OF THE DUAL-AXIS TRACKING PARABOLIC SOLAR CONCENTRATOR

作　　者：齐井超 田瑞[1,2] 王志敏[1,2] 李培涛[1] 郭枭[1,2] 董银元[1] 

机构地区：[1]内蒙古工业大学能源与动力工程学院,呼和浩特010051 [2]风能太阳能利用技术教育部重点实验室,呼和浩特010051

出　　处：《太阳能学报》2017年第7期1735-1740,共6页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51266007);内蒙古自治区自然科学基金(2014MS0515)

摘　　要：针对双轴跟踪槽式太阳能聚光器焦斑温度场,采用新型测试靶进行实验研究,提出一种可以迅速、精确得到焦斑偏移量的数学方法,对聚光特性中的最高转换温度、焦斑温度均匀性、焦斑宽度、焦斑偏移量展开分析。结果表明:在焦距455 mm处位置,随着太阳直射辐照度DNI的增大,聚光器最高转换温度以及温度场均匀性变化趋势不同,采用Fluke Ti55FT红外热成像仪对焦斑形状进行捕捉拍摄并根据标度读取焦斑宽度值;利用高斯函数拟合方法,在耦合系数较高的情况下,以函数特征数峰位置xc为焦斑中心位置,精确得到焦斑偏移量,通过多项式函数拟合,得出偏移量与测试靶移动距离的函数关系,为系统高效运行提供理论及数据支撑。In this paper, a new type of test target is used to study the focal spot temperature field of the double-axis tracked solar concentrator, and a mathematical method is proposed to obtain the value of the focal spot offset. To study the condensation characteristics, including the maximum conversion temperature, the uniformity of focal spot temperature, the width of focal spot and the offset of focal spot. The results showed that the maximum conversion temperature and the uniformity of the temperature field of the concentrator are different with the increase of the direct irradiance DNI at the focal length of 455 mm. The fluke Ti55FT infrared thermal imager was used to capture the focal spot shape and the focal spot width value was recorded according to the scale. By using the Gaussian function fitting method with high coupling coefficient, with the function characteristic xc as the focal spot center position, accurately obtained the values of focal spot offset. offset and the distance of the test target, Through the polynomial function fitting, obtained the relationship between the which provide theoretical and data support for the system to operate efficiently

关 键 词：太阳能 双轴跟踪 槽式聚光器 温度场 高斯函数 

分 类 号：TK513.1[动力工程及工程热物理—热能工程]