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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。由随机光于的传播特性可知,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(μ_a/μ_t)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μ_a/μ_t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。
The self-programmed Monte Carlo ray tracing program was used to simulate the propagation of solar radiation in the heat absorber, and the heat flux density distribution in the heat absorber was calculated. According to the propagation characteristics of random light, different system parameters will affect the radiation distribution in endothermic body. According to the order of solar radiation propagating in heat sink, the effects of incident angle of light, the geometry and thickness of porous media, the ratio of absorption coefficient to extinction coefficient (μ_a / μ_t) and porosity (ε) Effect of absorbed radiation on metal endothermic body. The calculated results show that the incidence angle and the geometry of the endothermic body are the main factors affecting the uniformity of the heat flow in the endothermic body. With the decrease of μ_a / μ_t ratio and the increase of ε, the extreme value of the heat flux in the endothermic body decreases rapidly , While the gradient of the heat flux density in the thickness direction becomes slow. The results of this paper can provide references for structural design and material selection of solar heat sinks.