平屋顶槽式聚光器风压分布及形成机理

通过Ansys Workbench平台，建立了屋顶槽式聚光器数值模拟计算模型，对平屋顶上槽式聚光器的风压分布进行了大涡模拟。并将模拟得到的结果与风洞试验进行对比，验证了大涡模拟结果的准确性。研究了顺风向和斜风向角下槽式聚光器镜面的风压分布规律，以及屋顶槽式聚光器风荷载的形成机理，同时对不同仰角和不同女儿墙高度进行对比分析。结果表明，顺风向工况下聚光器镜面风压主要受屋顶柱状涡所控制，斜风向工况下镜面的风压主要由受聚光器周围的局部旋涡所造成；聚光器镜面的风压系数随仰角的增大而减小；屋顶女儿墙高度的增加会一定程度上减小槽式聚光器镜面的风压系数，顺风向下受女儿墙高度变化比斜风向情况下更明显。所得结论可以为平屋顶槽式聚光器的结构抗风研究提供理论依据。

Study of wind pressure distribution and formation mechanism of slotted concentrators on flat roofs

A numerical simulation model of a roof slot concentrator was established through the Ansys Workbench platform, and a large eddy simulation of the wind pressure distribution of a slot concentrator on a flat roof was carried out. The simulation results were compared with wind tunnel tests to verify the accuracy of the large eddy simulation results. The wind pressure distribution pattern of the mirror surface of the slot type concentrator under downwind and oblique wind direction angles and the formation mechanism of wind load on the slot type concentrator on the roof were investigated, and a comparative analysis was also carried out for different elevation angles and different daughter wall heights. The results show that the wind pressure on the mirror surface of the concentrator is mainly controlled by the columnar vortex on the roof under downwind conditions, while the wind pressure on the mirror surface under oblique wind conditions is mainly caused by the local vortex around the concentrator; the wind pressure coefficient on the mirror surface of the concentrator decreases with the increase of elevation angle; the increase of the height of the daughter wall on the roof reduces the wind pressure coefficient on the mirror surface of the slot concentrator to a certain extent, and the change of the height of the daughter wall downwind is more significant than that in oblique wind conditions. The change in the height of the daughter wall is more pronounced downwind than in oblique wind direction. The conclusions obtained can provide a theoretical basis for the study of the structural wind resistance of slotted concentrators on flat roofs.