曲面太阳辐射能流密度的实验测量

Experimental Measurement of Solar Radiation Energy Flux Distribution on Curved Surfaces

为测量曲面吸热器入射聚集的太阳能流密度分布,根据曲面辐射传输的特点提出了一种分割-拼接的曲面聚集太阳能流密度分布测量方法。通过分割、提取半球壳体,设计、加工了一种中空水冷条形球弧朗伯靶。借助图像空间坐标转换和表面辐射传输计算方法,获得了由多幅子图像拼接形成的完整球壳曲面。在室内太阳能模拟器上,结合CCD相机组装测试系统,对该测量方法进行了实验验证。结果表明,该方法的不确定度为5.12%。沿半球曲面圆周角和天顶角方向聚集的太阳能流密度分布不均匀,能流密度峰值出现在曲面顶点外缘的局部区域,与焦平面能流密度分布存在明显差异。

In order to measure the concentrated solar radiation flux distribution of curved surface absorbers,based on segmentedjointed approaches,a measurement method for the solar flux density distribution on the curved surfaces is proposed according to the characteristics of the surface radiation transfer.By dividing and extracting the hemispherical shell,a hollow watercooled strip spherical arc Lambertian target is designed and processed.Using image space coordinate transformation and surface radiation transfer calculation,the entire spherical shell surface is obtained by splicing multiple subimages.The measurement method is experimentally verified on an indoor solar simulator using a CCD camera to assemble a test system.The results show that the uncertainty of this method is 5.12%.The distribution of solar flux density along the circumferential and zenith angles of the hemispherical surface is uneven,and the peak energy flux density appears at the outer edge of the surface vertex,which is significantly different from the focal plane energy flux density distribution.