旋转抛物面误差对聚光性能的影响

ERRORS' INFLUENCE OF SPINNING PARABOLOIDAL ON CONCENTRATING PERFORMANCES

采用蒙特卡洛法,建立了太阳光分布、抛物面误差及反射的概率模型,跟踪光线行程,研究了误差对抛物面焦平面上聚光性能影响。研究表明,误差会显著改变焦平面上的聚光比分布和大小,影响旋转抛物面的聚光性能。总体而言,随着最大误差角度增大,旋转抛物面的最大聚光比和总聚光比减小,热点和最远进光的r/R增大。只是在最大误差较小的范围内,最大聚光比基本相等,热点的r/R则会小于理想旋转抛物面。因此,为了对接收器进行合理的设计和性能预测,需要认真分析旋转抛物面误差对聚光性能的影响,并尽可能提高抛物面的制作精度。

This Monte Carlo method was used to build simulating probability models of sunlight distribution, parabolic reflecting and errors, track tours of solar rays, and study errors＇ of spinning paraboloidal on concentrating performances. Results show that errors will change the size and distribution of energy flow on the focal plane significantly and influence concentrating performance of spinning paraboloidal. Taking one with another, with the increasing of maximum error angle, the largest concentrating ratio and total concentrating ratio will decrease, and r/R of hot point and the farthest incoming solar ray will increase. If the maximum error is in a smaller scope, r/R of hot peint will be less than that of ideal spinning pamboloidal, although the largest concentrating ratio is basically same. Therefore, in order to rationally design receiver and predict performance, careful error analysis of spinning paraboloidal on concentrating performances is required, and maximizing the production precision of spinning paraboloidal is needed.