大跨马鞍屋盖脉动风压谱特性

发布时间：2018-02-02 20:08

本文关键词： 鞍形屋盖测压试验风压谱旋涡风吸力　出处：《哈尔滨工业大学学报》2017年06期 　论文类型：期刊论文

【摘要】：为研究谱能量与旋涡运动或湍流尺度之间的演变关系,基于风洞测压试验,分析了来流垂直于马鞍体迎风墙面时不同矢跨比和不同迎风面高度下的屋面风压分布特性,以迎风低点、迎风中点和迎风高点3个关键测点为研究对象,揭示了在旋涡作用下的脉动风压功率谱特性.分析表明:风吸力最大值出现在迎风低点附近,且风压变化梯度大;矢跨比对屋面风压的影响主要表现在屋盖后方三分之二区域,且曲率越大风吸力越大;迎风面高度越高其风吸力越大,在迎风低点附近其风吸力变化幅度达到最大;马鞍迎风高点和中点处测点风压谱表现为窄频分布,前缘以低频为主控,后缘高频段能量显著高于前缘,而迎风低点处前缘为宽频分布且随来流向后发展高频能量逐渐增大.
[Abstract]:In order to study the evolutionary relationship between spectral energy and vortex motion or turbulence scale, the wind tunnel pressure measurement test was carried out. The distribution characteristics of roof wind pressure under different rise-to-span ratio and different upwind height are analyzed when the incoming flow is perpendicular to the saddle body upwind wall. Three key measuring points, namely upwind low point, upwind midpoint and upwind high point, are taken as the research object. The analysis shows that the maximum wind suction appears near the upwind low point and the variation gradient of wind pressure is large. The effect of rise-span ratio on the wind pressure of roof is mainly in the 2/3 area behind the roof, and the higher the curvature is, the greater the suction is. The higher the height of upwind surface, the greater the wind suction, and the maximum variation range of wind suction near the upwind low point. The wind pressure spectrum at the high and middle points of saddle windward wind shows a narrow frequency distribution, the front edge is dominated by low frequency, and the energy of high frequency band in the rear edge is significantly higher than that in the leading edge. At the upwind low point, the front edge is broadband distribution and the high frequency energy increases with the coming direction.
【作者单位】：混凝土与预应力混凝土结构教育部重点实验室(东南大学);
【基金】：国家杰出青年科学基金(51125031) 江苏省普通高校研究生科研创新计划(KYLX_0157) 中央高校基本科研业务费专项资金(3205005718)
【分类号】：TU317
【正文快照】： 风是由大气相对运动形成的自然现象,大部分建筑物均处于大气边界层中,在靠近地表附近,风受到建筑物的影响而导致湍流度高且风速梯度大,再加上屋盖结构造型的多变,绕流和空气动力学作用相当复杂.当来流到达屋盖的迎风前缘处,边界层将发生流动分离,进而在屋盖表面上方出现各种尺

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