旋转抛物面聚光器焦面能流分布的有限元分析

提出一种计算太阳能聚光器聚光焦斑能流密度分布的新方法。在考虑太阳形状、聚光器表面形状误差、跟踪误差、接收器位置误差、漫反射及接收器遮挡作用等各项光学误差和影响因素的基础上,结合旋转抛物面聚光器的光学特性,采用有限元法对焦面能流密度分布进行计算,并与文献中的结果进行比较,证明了该方法的正确性和可行性。同时又对半球形接收器和圆柱形接收器进行了实例计算,结果表明该方法不受聚光器或接收器面型的限制,算法简单,通用性也较强,从而为系统的优化设计和能流密度的测量奠定基础。

Finite-Element Analysis for Flux Distribution on Focal Plane of Rotating Parabolic Concentrators

A new analysis method is proposed for calculating the flux density distribution on focal plane of solar concentrators.On the basis of considering the optical errors and the influence factors which are the sunshape,the random surface error of concentrators,the tracking error,the position error of receivers,the diffuse reflection and the shadow of receivers,with the optical properties of concentrators,the finite element method is used to calculate the flux distribution on the focal plane.The validity and the feasibility of the method are demonstrated by comparing results with those in references.The flux density of hemispheric receiver and cylindrical receiver are also calculated.The results show that the method is independent of the surface contour of concentrators or receivers.It is a simple and universal method that establishes the base for optimizing the system efficiency and measuring the flux-density distribution.