建筑结构学报2013，Vol.34Issue(6)：13-21,9.
大跨平屋盖表面锥形涡流动模型研究
Flow model of conical vortices on large-span fiat roof
摘要
Abstract
Based on measured velocities in conical vortices by flow visualization,a simplified two-dimensional vortex model was established by adding transitional region between the vortex core and the potential flow region of the Rankine vortex.Through this flow model,a relationship between the flow above the vortices,the curvature radius of flow streamlines in the vortices and the suctions beneath vortex cores was given.The flow model indicats that the larger the curvature of flow streamlines and the faster the vortex spins,the greater the intensity of vortex is.The effect of rational velocity on intensity of vortices is more obvious.Through measured velocities by flow visualization and parameters of vortices,the intensities of conical vortices on a large-span fiat roof under different wind directions were provided.The quasi-steady theory was corrected by including the effect of vortices.With this two-dimensional vortex model and the corrected quasi-steady theory,mean and peak suctions beneath cores of conical vortices can be predicted,which were verified by measured pressures on a larger-scale model of the large-span flat roof.关键词
大跨度平屋盖/锥形涡/旋涡流动模型/涡核吸力预测/PIV试验Key words
large-span flat roof/ conical vortices/ flow model of vortex/ prediction of suctions beneath vortex cores/PIV experiment分类
建筑与水利引用本文复制引用
董欣,叶继红..大跨平屋盖表面锥形涡流动模型研究[J].建筑结构学报,2013,34(6):13-21,9.基金项目
国家杰出青年科学基金项目(51125031),同济大学土木工程防灾国家重点实验室开放课题基金项目(SLDRCE08-MB-02),江苏省土木工程博士研究生科技创新基金项目. （51125031）
