An Investigation of the Surface Pressure Fields beneath Simulated Tornado Cyclones
An Investigation of the Surface Pressure Fields beneath Simulated Tornado Cyclones
复制标题
模拟龙卷风气旋下方表面压力场的研究
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
B. Barnhart
中科院分区：
文献类型：
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作者：
J. Snow;C. R. Church;B. Barnhart
摘要利用一台专门设计用于模拟龙卷风气流的大型涡流发生器，研究了类龙卷风涡旋下的壁面静压场。以无量纲形式呈现，数据包括各种流动条件下的平均压力场的一系列径向剖面，以及作为涡流函数的中心压力大小的详细调查。剖面图清楚地显示了强涡核从无旋状态的发展，以及涡核从单胞流到双胞流的演变。对于实验范围内检查，它被发现，最大的压力赤字和最大的压力梯度（在平均场）与单细胞涡。强有力的证据被发现在双胞涡的动力诱导的下沉气流的存在。
Abstract The wall static pressure fields beneath tornado-like vortices have been investigated using a large vortex generator especially designed to model tornado cyclone airflow. Presented in nondimensional form, the data include both a series of radial profiles across the mean pressure field under a variety of flow conditions, and a detailed investigation of the magnitude of the central pressure as a function of swirl. The profiles clearly show the development of the intense vortical core from the no-swirl state, and the evolution of the core from a one-celled into a two-celled flow. For the experimental range examined, it is found that the greatest pressure deficits and largest pressure gradients (in the mean field) are associated with single-celled vortices. Strong evidence is found for the existence of a dynamically induced downdraft in the two-celled vortex.