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利用动网格技术实现日光模拟器的动态运动模拟,对不同工况下模拟器的动态辐照特性进行研究。利用动网格模型中的动态铺层算法来实现网格的更新,通过用户自定义函数UDF定义模拟器的周期性升降运动。通过数值计算得到辐照度变化的详尽动态信息,并与实验数据进行对比分析。结果显示,模拟器高度和光源数量是影响辐照度的主要因素。模拟器距地面高度与地面辐照度呈线性关系,辐照不均匀性随高度降低而变小;各工况下辐照度满足叠加性;典型点的动态辐照度数值结果与实验结果基本吻合,验证了该动网格数值模型的可靠性。该模型可用于其他多种工况的研究,为实现太阳辐射的日变化模拟提供预测数据参考。
The dynamic simulation of daylight simulator is realized by moving grid technology, and the dynamic radiation characteristics of simulator under different working conditions are studied. Dynamic meshing algorithm in dynamic mesh model is used to update the grid. The user-defined function UDF is used to define the cyclical movements of the simulator. Through the numerical calculation, the detailed dynamic information about the change of irradiance is obtained and compared with the experimental data. The results show that the height of the simulator and the number of light sources are the main factors affecting the irradiance. The simulator has a linear relationship with the ground irradiance and the irradiance inhomogeneity decreases with the height decreasing. The irradiance satisfies the additive in each working condition. The numerical results and the experimental results of the typical irradiance The results show the reliability of the moving mesh numerical model. This model can be used in many other conditions and provides a reference for forecasting the diurnal variation of solar radiation.