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首页> 外文会议>International Conference on Modelling, Monitoring and Management of Air Pollution; 200605; New forest(GB) >Dispersion through an obstacle array: a wind tunnel investigation
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Dispersion through an obstacle array: a wind tunnel investigation

机译：通过障碍物阵列的扩散：风洞调查

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摘要

In order to study flow and dispersion of a passive scalar through a group of obstacles, we performed wind tunnel experiments in a neutrally stratified boundary layer. The aim of the study was to evaluate the influence of obstacle geometry and of wind direction on the spreading of a passive scalar plume. An idealized urban neighborhood was simulated by means of an array of aligned blocks, whose height H was approximately 1/16 of the simulated boundary layer depth; the width and the length of each block were 5H. The pollutant source was placed at height H/2 within the array. Flow-field and mean concentration data were obtained for different wind directions, which varied from 0 to 45°, and for different spacing between the obstacles, which varied from H to 2H; all measurements were performed within and above the obstacle array. Measurements of concentration have been examined in order to evaluate the mass exchange processes and their dependence to the wind orientation. Our goal was to verify the extent of the applicability of a simple analytical model in rather complex geometries.
机译：为了研究无源标量通过一组障碍物的流动和扩散，我们在中性分层边界层中进行了风洞实验。该研究的目的是评估障碍物几何形状和风向对被动标量羽流扩散的影响。理想的城市邻里通过对齐块的阵列进行模拟，其高度H约为模拟边界层深度的1/16；每个块的宽度和长度为5H。污染物源放置在阵列内的高度H / 2处。获得了不同风向的流场和平均浓度数据，风向从0到45°，障碍物之间的间距从H到2H。所有测量均在障碍物阵列之内和之上进行。为了评估质量交换过程及其对风向的依赖性，已经对浓度的测量进行了检查。我们的目标是验证简单分析模型在相当复杂的几何形状中的适用范围。

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