Characteristics of Tornado-Like Vortices Simulated in a Large-Scale Ward-Type Simulator
Characteristics of Tornado-Like Vortices Simulated in a Large-Scale Ward-Type Simulator
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DOI：
10.1007/s10546-017-0305-7
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发表时间：
2018-02-01
影响因子：
4.3
通讯作者：
James, Darryl L.
中科院分区：
文献类型：
--
作者：
Tang, Zhuo;Feng, Changda;James, Darryl L.
在大型Ward型模拟器中模拟了类似龙卷风的旋涡，以进一步加深对此类流动的理解，并促进未来对结构物上龙卷风风荷载的研究。模拟器地板附近的速度场和由此产生的地板表面压力的测量被解释为揭示的平均值和波动特性的流量以及静压赤字的特性。我们专注于涡流比和径向雷诺数影响这些特性的方式。随着旋流比的增加，龙卷风状流从单胞涡到双胞涡的转变以及这种转变对流场和表面压力亏损的影响进行了仔细研究。的平均特性的表面压力赤字所造成的龙卷风样的漩涡模拟在一些旋流比比较以及与相应的特性记录在全尺度龙卷风。
Tornado-like vortices are simulated in a large-scale Ward-type simulator to further advance the understanding of such flows, and to facilitate future studies of tornado wind loading on structures. Measurements of the velocity fields near the simulator floor and the resulting floor surface pressures are interpreted to reveal the mean and fluctuating characteristics of the flow as well as the characteristics of the static-pressure deficit. We focus on the manner in which the swirl ratio and the radial Reynolds number affect these characteristics. The transition of the tornado-like flow from a single-celled vortex to a dual-celled vortex with increasing swirl ratio and the impact of this transition on the flow field and the surface-pressure deficit are closely examined. The mean characteristics of the surface-pressure deficit caused by tornado-like vortices simulated at a number of swirl ratios compare well with the corresponding characteristics recorded during full-scale tornadoes.