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基于太阳能聚光集热系统的几何对称特性,提出一种运动累加方法来计算吸热器的能流密度分布。采用光线跟踪方法,推导了吸热器表面能流分布的运动累加数学模型,此模型可以将光线跟踪过程转换为旋转运动或平移运动,避免大量求解光线与吸热器曲面的联立方程组。在Visual C++平台编制运动累加程序,计算了典型的碟式和槽式系统配置不同吸热器的能流密度分布,并与文献对比验证了该方法的正确性。结果表明,在碟式—腔式吸热器中,跟踪光线6.10×108根需112s,在结果符合的情况下可跟踪光线9.648×107根,这样仅需16s。运动累加方法的计算过程较简单,且具有一定的计算效率,可以为对称特征的聚光集热系统参数协同优化提供一定参考。
Based on the geometric symmetry of solar concentrating heat collecting system, a kinematic accumulating method is proposed to calculate the energy density distribution of heat sink. By using ray tracing method, the kinematic cumulation model of surface energy flow distribution of heat sink is deduced. The model can convert the ray tracing process into rotational or translational motion, which avoids the large number of simultaneous equations for solving the surface of light and heat absorber. On the Visual C ++ platform, the motion accumulation program is compiled and the energy dispersive density distribution of different heat sinks is calculated in a typical disk and tank system. The correctness of the method is verified by comparison with the literature. The results show that in the dish-cavity heat sink, the tracing light is 6.10 × 108 root for 112s, and if the result is consistent, the tracing light is 9.648 × 107 root, which only takes 16s. The calculation of motion accumulation method is simple and has a certain computational efficiency, which can provide some reference for the parameter optimization of the condenser system with symmetrical features.