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首页> 外文会议>MWWD amp; IEMES 2012 >Plume dilution from linear diffusers: influence of current direction
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Plume dilution from linear diffusers: influence of current direction

机译：线性扩散器的羽流稀释：电流方向的影响

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An isolated point source plume discharged horizontally into a current will experience more dilution in a cross-current than if the currentrnis co-flowing. If worst-case conditions are valued for the purposes of simplifying modeling requirements and protecting the environmentrnthen the co-flowing scenario might be recommended for assessing the discharge, that is, it is conservative. But what happens when therndischarge involves a multi-port linear diffuser? Is the co-flowing case still conservative? This paper examines the effect of currentrndirection on the dilution performance of multi-port diffusers based on a range of current directions, effluent to current speed ratios,rnplume spacing, stratification numbers, and port densimetric Froude numbers. Various factors influence the conclusions including therndistance to the endpoint: trapping level, distance to maximum rise, arbitrary mixing zone dimension or other measure. An updatedrnversion of the EPA Visual Plumes UM3 model is used to produce the necessary dilution estimates. UM3 features a projected arearnentrainment hypothesis and a merging mechanism based on a reflection technique, both influential in modulating dilution predictions. Itrnis found that co-flowing conditions rarely result in conservative estimates of plume dilution.
机译：水平流排放到电流中的隔离点源羽状流将比交叉流共同流动时受到更大的稀释。如果为了简化建模要求和保护环境而对最坏情况进行评估，则可能建议采用同流方案来评估排放量，也就是说，这是保守的。但是，当放电涉及多端口线性扩散器时会发生什么？并存案仍然保守吗？本文根据一系列电流方向，流出物与电流速度比，rnplume间距，分层数和端口密度弗洛德数，研究电流方向对多端口扩散器稀释性能的影响。各种因素都会影响结论，包括到端点的距离：陷井高度，到最大上升的距离，任意混合区域尺寸或其他度量。 EPA Visual Plumes UM3模型的更新版本用于生成必要的稀释度估算值。 UM3的特征是预计的区域神经网络假说和基于反射技术的合并机制，两者都对调制稀释预测有影响。 Itrnis发现，并流条件很少导致烟羽稀释的保守估计。

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