Numerical Study on Plane and Radial Wall Jets to Validate the 2D Assumption for an Idealized Downburst Outflow
Numerical Study on Plane and Radial Wall Jets to Validate the 2D Assumption for an Idealized Downburst Outflow
复制标题
平面和径向壁射流的数值研究，以验证理想化下爆流外流的二维假设
DOI：
10.1155/2021/9993981
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发表时间：
2021-11
影响因子：
1.8
通讯作者：
Zhang Hua
中科院分区：
文献类型：
--
作者：
Zhong Yongli;Yan Zhitao;Li Yan;Luo Jie;Zhang Hua
在过去的几十年里，湍流径向和平面壁射流已经被广泛地研究了实验和数值模拟。以往的研究主要集中在射流中的传热传质方面。在这项研究中，进行了全面的研究湍流径向和平面壁射流，考虑到射流扩展和速度衰减的不同参数。数值结果与现有的实验测量进行了比较。比较集中在速度分布，射流传播，和速度衰减，并显示雷诺应力模型（RSM）在径向和平面壁射流的模拟表现良好。结果表明，对于大多数下击暴流事件，在典型的云底高径比条件下，喷嘴高度和雷诺数对径向壁面射流演化的影响并不显著。射流扩散和速度衰减都表现出明显的依赖于雷诺数低于临界值。在这个临界值以上，平面壁射流变得渐近地与雷诺数无关。研究发现，同向流动对平面附壁射流的演化有重要影响。径向壁面射流的射流速度和射流扩展速度均比平面射流快。对于土木工程中的应用，它是有效的近似下击暴流流出与二维（2D）的假设，从纵向演变的流动的角度来看。
Turbulent radial and plane wall jets have been extensively investigated both experimentally and numerically over the past few decades. Previous studies mostly focused on the heat and mass transfers involved in jet flows. In this study, a comprehensive investigation was conducted on turbulent radial and plane wall jets, considering both jet spread and velocity decay for different parameters. The numerical results were compared with existing experimental measurements. The comparison focused on the velocity profile, jet spread, and velocity decay, and revealed that the Reynolds stress model (RSM) performs well in the simulation of both radial and plane wall jets. The results show that with a typical ratio of cloud base height to diameter for most downburst events, the effects of nozzle height and Reynolds number on the evolution of the radial wall jet are not significant. Both the jet spread and velocity decay exhibit a clear dependence on the Reynolds number below a critical value. Above this critical value, the plane wall jet becomes asymptotically independent of the Reynolds number. The co-flow was found to have a significant influence on the evolution of the plane wall jet. Comparatively, the jet spread and velocity of the radial wall jet were faster than those of the plane jet. For applications in civil engineering, it is valid to approximate the downburst outflow with a two-dimensional (2D) assumption from the perspective of longitudinal evolution of the flows.
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影响因子：
5.5
作者：
E. Savory;G. Parke;M. Zeinoddini;N. Toy;P. Disney
通讯作者：
E. Savory;G. Parke;M. Zeinoddini;N. Toy;P. Disney
DOI：
10.1016/s0017-9310(05)80204-2
发表时间：
1993-07-01
影响因子：
5.2
作者：
COOPER, D;JACKSON, DC;LIAO, GX
通讯作者：
LIAO, GX
影响因子：
4.6
作者：
Tianqi Guo;M. Rau;P. Vlachos;S. Garimella
通讯作者：
Tianqi Guo;M. Rau;P. Vlachos;S. Garimella
DOI：
10.1175/1520-0450(1988)027
发表时间：
1988-03
期刊：
Journal of Applied Meteorology
影响因子：
--
作者：
R. K. Wong;Norman Chidambaram;Lawrence Cheng;M. English
通讯作者：
R. K. Wong;Norman Chidambaram;Lawrence Cheng;M. English
影响因子：
4.8
作者：
McConville
通讯作者：
McConville