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风洞测量湍流和平流标量通量：以交叉路口通风为例的研究

Wind tunnel measurement of turbulent and advective scalar fluxes: a case study on intersection ventilation.

作者信息

Kukačka Libor, Nosek Štĕpán, Kellnerová Radka, Jurčáková Klára, Jaňour Zbyněk

机构信息

Department of Meteorology and Environment Protection, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 180 00 Prague, Czech Republic.

出版信息

ScientificWorldJournal. 2012;2012:381357. doi: 10.1100/2012/381357. Epub 2012 Jan 16.

DOI:10.1100/2012/381357
PMID:22649290
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3352249/
Abstract

The objective of this study is to determine processes of pollution ventilation in the X-shaped street intersection in an idealized symmetric urban area for the changing approach flow direction. A unique experimental setup for simultaneous wind tunnel measurement of the flow velocity and the tracer gas concentration in a high temporal resolution is assembled. Advective horizontal and vertical scalar fluxes are computed from averaged measured velocity and concentration data within the street intersection. Vertical advective and turbulent scalar fluxes are computed from synchronized velocity and concentration signals measured in the plane above the intersection. All the results are obtained for five approach flow directions. The influence of the approach flow on the advective and turbulent fluxes is determined. The contribution of the advective and turbulent flux to the ventilation is discussed. Wind direction with the best dispersive conditions in the area is found. The quadrant analysis is applied to the synchronized signals of velocity and concentration fluctuation to determine events with the dominant contribution to the momentum flux and turbulent scalar flux.

摘要

本研究的目的是确定在理想化对称城市区域中，X形街道交叉路口随进流方向变化的污染通风过程。组装了一种独特的实验装置，用于在高时间分辨率下同时进行风洞流速和示踪气体浓度测量。根据街道交叉路口内平均测量的速度和浓度数据计算平流水平和垂直标量通量。根据在交叉路口上方平面中测量的同步速度和浓度信号计算垂直平流和湍流量通量。所有结果均针对五个进流方向获得。确定了进流对平流和湍流量通量的影响。讨论了平流和湍流量通量对通风的贡献。找到了该区域中具有最佳扩散条件的风向。将象限分析应用于速度和浓度波动的同步信号，以确定对动量通量和湍流量通量有主要贡献的事件。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/74bb/3352249/a66370d33184/TSWJ2012-381357.014.jpg
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