基于流动控制方式的平屋盖抗风研究

文中以减弱大跨屋盖顶部前缘区域负风压,提高屋盖结构安全性为目的。将涡发生器应用于建筑屋盖结构中,期望利用涡发生器的流动控制原理扰动屋顶流场消减屋顶负风压极值,减小风吸力,提高屋盖安全性。运用数值模拟的方法,通过将涡发生器安置在平屋顶迎风面顶端进行了不同工况的对比研究,同时探讨了涡发生器尺寸参数、安置位置等参数对屋顶负风压控制效果的影响。结果表明,涡发生器安装在迎风面顶端的时,其对屋顶前缘负风压极值区域有明显抑制效果,涡发生器的流动分离抑制功能可以削弱平屋盖屋顶负风压防止屋盖掀飞破坏,为提高屋盖结构抗风安全性提供参考。

RESEARCH ON WIND PRESSURE RESISTANCE OF FLAT ROOF BASED ON FLOW CONTROL METHOD

This paper aims to reduce the negative wind pressure at the leading edge of the large span roof and improve the safety of the roof structure. In this paper, the vortex generator is applied to windward surface of flat roof structure. It is expected that the flow control theory of the vortex generator can be used to disturb the roof flow field, reduce the extreme value of the negative wind pressure of the roof , reduce the wind suction and improve safety of the roof. In this paper, numerical simulation is used to compare and study different working conditions by placing the vortex generator on the top of the windward surface of the flat roof. Meanwhile, the influence of the size parameters and placement position of the vortex generator on the negative wind pressure control effect of the roof is discussed. The results show that when the vortex generator is installed on the top of the windward surface, it has a significant inhibiting effect on the negative wind pressure extreme value area at the leading edge of the roof. The flow separation inhibiting function of the vortex generator can weaken the negative wind pressure on the flat roof and prevent the roof from lifting up which providing a reference for improving the safety of wind resistance of the roof structure.