几何特征对柱面屋盖雷诺数转捩区间影响的风洞试验研究

发布时间：2018-06-15 07:39

本文选题：柱面屋盖 + 几何特征　；参考：《建筑结构学报》2016年12期

【摘要】：大跨度柱面屋盖结构的风荷载特性具有明显的雷诺数效应,其屋盖几何特征对风荷载雷诺数效应影响较大。为此,以柱面屋盖为研究对象,开展了考虑几何特征影响的雷诺数效应风洞试验,变化几何特征参数包括矢跨比(f/L为1/6~1/2)和长跨比(B/L为1~12),试验雷诺数Re范围为6.90×10~4~1.38×10~6。基于风洞试验数据,分析了模型表面风压分布规律、压力梯度和升阻力曲线等。研究结果表明:柱面屋盖长跨比减小、矢跨比增大会使雷诺数转捩区间的下限值向高雷诺数范围转移,即三维绕流效应使得分离边界层出现转捩滞后现象;当模型长跨比B/L由12减小至1时,雷诺数转捩区间下限值从1.66×10~5逐渐增大至4.14×10~5;当矢跨比f/L由1/3增加至1/2时,转捩区间下限值则从2.48×10~5增大至4.14×10~5;对矢跨比1/6屋盖模型,在试验雷诺数(6.90×10~4~2.48×10~5)范围内无明显雷诺数效应。
[Abstract]:The wind load characteristics of long-span cylindrical roof structure have obvious Reynolds number effect, and the geometric characteristics of the roof have great influence on the wind load Reynolds number effect. Therefore, a wind tunnel experiment of Reynolds number effect considering the influence of geometric characteristics was carried out on cylindrical roof. The geometric characteristic parameters include the vector / span ratio F / L = 1 / 6 / 1 / 2) and the long span ratio B / L = 1 / 12 / L, and the Reynolds number re range is 6.90 脳 10 ~ (10) ~ 41.38 脳 10 ~ (6) F ~ (-1) ~ (-1). Based on the wind tunnel test data, the wind pressure distribution, pressure gradient and resistance curve on the surface of the model are analyzed. The results show that when the ratio of length to span of cylindrical roof decreases and the rise-span ratio increases, the lower bound of Reynolds number transition region will be transferred to the range of high Reynolds number, that is, the phenomenon of transition hysteresis will occur in the separated boundary layer due to the three-dimensional flow around the boundary layer. When the model span ratio B / L decreases from 12 to 1, the lower limit of Reynolds number transition range gradually increases from 1.66 脳 10 ~ (5) to 4.14 脳 10 ~ (5); when the span ratio f / L is increased from 1 / 3 to 1 / 2, the transition limit increases from 2.48 脳 10 ~ (5) to 4.14 脳 10 ~ (5). There is no obvious Reynolds number effect in the range of 6.90 脳 10 ~ (4) ~ (4) ~ (2. 48 脳 10 ~ (5).
【作者单位】：哈尔滨工业大学结构工程灾变与控制教育部重点实验室;哈尔滨工业大学土木工程学院;河海大学土木与交通学院;
【基金】：国家自然科学基金面上项目(51278160,51478155,51378147)
【分类号】：TU317

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