屋顶光伏阵列不同放置角度的风载荷研究

Study on wind load for photovoltaic array about the roof under different placement angles

文章利用计算流体力学方法,分析放置角度对光伏板倾覆效应、净载荷作用及屋顶流场分布的影响。研究结果表明:在放置角度α为30°时,风向角度的改变对阵列受到的倾覆效应和净载荷作用的强弱影响较大,其中板3受到的倾覆效应和净载荷作用较强;在风向角为180°时,前3排光伏板随阵列放置角度的增大,倾覆效应不断减弱,尾缘板的倾覆效应呈现先增大后减小的趋势,各板在α为45°~75°时倾覆效应较弱;在放置角度α为60°~75°时,光伏阵列各板净载荷作用均较弱,且阵列表面风压分布趋于均匀。放置角度的增大使光伏阵列对气流的阻挡面积减小,分离程度得到改善。研究结果可为实际工程应用提供一定的参考,有效提高光伏系统使用寿命。

In this paper,computational fluid dynamics(CFD)method is used to analyze the influence of placement angle on the overturning effect,net load effect and roof flow field distribution of photovoltaic panels.The results show that when the placement angleαis 30°,the change of the wind direction angle has a greater impact on the overturning effect and net load effect on the array,and the overturning effect and net load effect on the plate 3 are relatively strong.When the wind direction angle is 180°,with the increase of array placement angle,the overturning effect of the first three rows of photovoltaic panels decreases,while the overturning effect of trailing edge panels increases first and then decreases,and whenαis between 45°-75°,the overturning effect of each panel is weak.Whenαis between 60°-75°,the net load of each panel is weak,and the wind pressure distribution on the array surface tends to be uniform.With the increase of the placement angle,the hinder area of photovoltaic array to airflow is reduced,and the separation level of surrounding vortex is reduced.The research results can provide reference for practical engineering application and effectively improve the service life of photovoltaic system.