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将泡沫孔筋等效成粒子系,建立了抛物面聚光器与容积式吸热器数理模型。基于Mie理论计算泡沫材料的散射特性,采用蒙特卡洛射线踪迹法模拟聚集太阳光在泡沫材料内的传输衰减特性。通过计算,获得了吸热器体积内的太阳能流吸收分布。结果表明:吸收太阳能流集中在吸热器底部,随着孔隙率和孔隙直径增加,吸热器内的太阳能吸收分布均匀性更好。研究结论为容积式太阳能吸热器结构设计与性能分析提供了参考。
The foaming tendons are equivalent to the particle system, and the mathematical model of the parabolic condenser and the volumetric heat absorber is established. Based on the Mie theory, the scattering properties of foam were calculated and Monte Carlo ray tracing method was used to simulate the transmission attenuation characteristics of concentrated sunlight in the foam. Through calculation, the absorption distribution of solar energy in the volume of the heat absorber is obtained. The results show that the absorbed solar energy flow concentrates on the bottom of the heat absorber. As the porosity and pore diameter increase, the uniformity of solar energy absorption and absorption in the heat absorber is better. The conclusion of the study provides a reference for the structural design and performance analysis of the positive displacement heat sink.