Experimental investigation of tornado-like vortex dynamics with swirl ratio: The mean and turbulent flow fields

被引：67
作者：
Tari, Pooyan Hashemi [1 ]
Gurka, Roi [1 ]
Hangan, Horia [1 ]
机构：
[1] Univ Western Ontario, Boundary Layer Wind Tunnel Lab, London, ON N6A 5B9, Canada
来源：
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS | 2010年 / 98卷 / 12期
关键词：
Tornado-like vortex; Swirl ratio; Particle Image Velocimetry (PIV); SIMULATION; VORTICES; TEXAS;
D O I：
10.1016/j.jweia.2010.10.001
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
An experimental simulation of tornado-like vortices is conducted in a small tornado vortex simulator in order to study the effect of swirl ratio on flow characteristics Particle Image Velocimetry (PIV) method is employed to quantitatively determine the tornado-vortex velocity field for swirl ratios ranging from 008 to 1 The radial and tangential components of velocity as well as the core radius of the tornado increase with increase in swirl ratio The location of the maximum radial and tangential velocities is adjacent to the ground where the tornado vortex interacts with the surface The values of normal and shear turbulent stresses indicate the existence of a laminar core for small swirl As expected the shear stresses Increase with swirl ratio as the vortex becomes turbulent The highest turbulent production corresponds to the critical case of vortex touchdown (c) 2010 Elsevier Ltd All rights reserved
引用
收藏
页码：936 / 944
页数：9
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