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首页> 外文期刊>Journal of Wind Engineering and Industrial Aerodynamics: The Journal of the International Association for Wind Engineering >Experimental investigation of tornado-like vortex dynamics with swirl ratio: The mean and turbulent flow fields
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Experimental investigation of tornado-like vortex dynamics with swirl ratio: The mean and turbulent flow fields

机译：旋流比的龙卷风状涡旋动力学实验研究：平均和湍流场

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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 0.08 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.
机译：为了研究旋流比对流动特性的影响，在小型龙卷风涡旋模拟器中进行了龙卷风状涡旋的实验模拟。粒子图像测速（PIV）方法用于定量确定旋流比范围为0.08至1的龙卷风涡旋速度场。速度的径向和切向分量以及龙卷风的核心半径随旋流比的增加而增加。最大径向和切向速度的位置与龙卷风涡旋与地面相互作用的地面相邻。正向和切变湍流应力的值表明存在小涡旋的层状核。正如预期的那样，随着涡流变得紊乱，剪切应力随着涡流比的增加而增加。最高的湍流产生对应于漩涡触地的关键情况。

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