采用自编程的蒙特卡罗光线追迹程序模拟了太阳辐射在吸热器中的传播过程，计算求得了吸热体内的热流密度分布情况。由随机光子的传播特性可知，不同的系统参数会对吸热体内辐射分布产生影响。根据太阳辐射在吸热器中的传播顺序，本文依次考察了入射光倾角、多孔介质的几何形状以及厚度、吸收系数与消光系数比值（μa／μt）以及孔隙率（ε）等因素对SiC泡沫金属吸热体内吸收辐射分布的影响。计算结果表明入射光倾角和吸热体的几何形状是影响吸热体内热流分布均匀性的主要因素，且随着μa／μt比值的降低和ε的增加，吸热体内热流密度极值迅速减小，同时厚度方向的热流密度梯度变缓。本文的研究结果可以为太阳能吸热器的结构设计和材料选择提供参考。
In this work, a Monte Carlo Ray Tracing computation program is built to simulate the solar radiation transmission process in the volumetric receiver, which can be used to calculate the local heat flux distribution in the absorber. According to the characteristics of the radiation propagation in the solar air receiver, the system parameters will directly influence the distribution of the heat flux. In the following, the influences of the different parameters, including the incident angle, the shape and thickness of absorber, optical property （μa/μt） and porosity of absorber et al., on the local heat flux in the receiver are investigated. The computation results show that the incident angle and shape of absorber are the main influence factors of heat flux distribution. Furthermore, as the increase of absorber porosity or decrease of the ratio of μa/μt, the absorbed radiation energy distributes more uniformly and the maximum heat flux of the absorber decreases greatly. The results obtained in this work will provide the basis for selecting the appropriate materials for the solar receiver and optimizing the design of the system structures.
参考文献
| [1] | A. Kribus;H. Ries;W. Spirkl .Inherent limitations of volumetric solar receivers[J].Journal of Solar Energy Engineering,1996(3):151-155. |
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