A nonuniform and high-strength heat flux load would reduce the working efficiency, safety, and in-service life of a cavity receiver. Four types of concave quartz windows, including conical, spherical, sinusoidal, and hyperbolic tangent, were proposed to be used in the cylindrical cavity receiver of a solar dish concentrator system, which can improve the flux uniformity and reduce the peak concentration ratio of the receiver. For each concave quartz window, 36 structural schemes were offered. Based on the Monte Carlo ray-tracing method, the results showed that the nonuniformity coefficient of the receiver was 0.68 and the peak concentration ratio was 1320.21 by using a plane quartz window. At the same time, when the receiver is in the best optical performance, it is the receiver with sinusoidal, conical, spherical, and hyperbolic tangent quartz windows, respectively. The optical efficiency of the receiver with the above four types of quartz windows was basically the same as that of the receiver with the plane quartz window, but their nonuniformity coefficients were reduced to 0.31, 0.35, 0.36, and 0.39, respectively, and the peak concentration ratio was reduced to 806.82, 841.31, 853.23, and 875.89, respectively. Obviously, the concave quartz window was better than the plane quartz window in improving the flux uniformity. Finally, a further study on the sinusoidal quartz window scheme of all of the above optimal parameter schemes showed that when the installation position of the receiver relative to the dish concentrator was changed, the flux uniformity of the receiver could continue to improve. When the surface absorptivity of the receiver was reduced, the optical efficiency would be reduced. For the parabolic dish concentrator with different focal distance, the concave quartz window can also improve the uniformity of the flux distribution of the cylindrical cavity receiver.

中文翻译：

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通过凹形石英窗改善太阳能碟形聚光器系统的通量均匀性

不均匀和高强度的热通量负载会降低腔体接收器的工作效率、安全性和使用寿命。提出将圆锥形、球形、正弦形和双曲切线型四种凹形石英窗用于碟形太阳能聚光器系统的圆柱形腔体接收器中，以提高通量均匀性并降低接收器的峰值聚光比。 . 对于每个凹面石英窗，提供了 36 种结构方案。基于蒙特卡罗射线追踪法，结果表明，使用平面石英窗，接收器的非均匀系数为0.68，峰浓度比为1320.21。同时，当接收器处于最佳光学性能时，接收器具有正弦、圆锥、球面、和双曲正切石英窗口，分别。上述四种石英窗接收器的光效率与平面石英窗接收器的光效率基本相同，但不均匀系数分别降低到0.31、0.35、0.36和0.39，峰值浓度比分别降低到 806.82、841.31、853.23 和 875.89。显然，凹形石英窗在提高通量均匀性方面优于平面石英窗。最后，对上述所有最优参数方案的正弦石英窗方案进一步研究表明，当接收器相对于碟形聚光器的安装位置发生变化时，接收器的通量均匀性可以不断提高。当接收器的表面吸收率降低时，光学效率会降低。对于不同焦距的抛物面碟形聚光器，凹石英窗还可以提高圆柱腔接收器通量分布的均匀性。