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Storage Reservoir Water Quality Improvements Using CFD 利用CFD改善水库水质
发布日期: 2007-06-01
该项目的目标是改善水库混合,同时尽量减少内部施工 两个水库。水库由EPCOR Water Services Inc.所有和运营。 在加拿大阿尔伯塔省埃德蒙顿,过滤器和分配泵之间平行布置 站在E.L.史密斯水处理厂。通过水库的水流是由重力引起的。计算流体力学 (CFD)分析已被用于确定停滞区域,并制定消除停滞的策略 他们本分析中使用的CFD软件是Fluent。可以评估混合效果 通过对稳态速度等值线的检查,但还需要进行更定量的评估 已使用Fluent的多物种建模功能完成。时间相关解 生成的浓度等值线图可以单独使用,也可以编译成 动画序列,观察混合过程。此外,还对进水进行了测量 流出物的浓度可用于比较整个范围内的水库性能 预期的流量。这些结果也可用于与示踪剂研究结果进行比较。 由于它们的结构不同,有两种不同的方法来改善混合 提议,但尚未实施。在一种情况下,水库与其进水和排水呈方形 污水位于相邻的角落,沿着蓄水池有一部分内壁 中心线防止了流量短路。安装九个短墙段 色谱柱足以促进跨通道混合并消除流动停滞区域 适用于所有流动条件。 在第二种情况下,水库又长又窄,进水和出水位于 相邻拐角,导致流量短路。由于进水的动能很小, 最终的解决方案是建造一个带有小开口的内壁,以促进堵塞 沿着蓄水池长度和另一个长度流动,以有效地重新定位废水。流动停滞是 已消除,但由于成本较低,提议的解决方案存在更大的不确定性 速度。 CFD是一个优秀的原型工具,可以经济高效地检查各种改进的可能性 水库混合。研究结果通常可用于指导创新型和创新型企业的发展 经济高效的解决方案,但有时不确定的结果表明,保守的设计 这种方法是恰当的。包括4个参考文献、表格和图表。
The objective of this project is to improve reservoir mixing while minimizing construction inside two reservoirs. The reservoirs, which are owned and operated by EPCOR Water Services Inc. in Edmonton, Alberta, Canada are arranged in parallel between the filters and the distribution pump station at the E.L. Smith Water Treatment Plant. Flow through the reservoirs is by gravity. Computational fluid dynamics (CFD) analysis has been used to identify stagnant regions and to develop a strategy to eliminate them. The CFD software used in this analysis is Fluent. Mixing effectiveness can be evaluated through examination of steady state velocity contours, but a more quantitative assessment has been completed using Fluent's multi-species modelling capabilities. Time dependent solutions produced concentration contour plots that can be used individually, or compiled into an animation sequence, to observe the mixing process. Also measurements of influent concentration at the effluent can be used to compare reservoir performance over the full range of anticipated flow rates. These results could also be used to compare with tracer study results. Due to differences in their configuration, two different approaches to improve mixing have been proposed, but not yet implemented. In one case, the reservoir is square with its influent and effluent located at adjacent corners and there is a partial internal wall along the reservoir centerline prevented flow short-circuiting. Installation of nine short wall sections between columns is sufficient to promote cross-channel mixing and eliminate regions of flow stagnation for all flow conditions. In the second case, the reservoir is very long and narrow with the influent and effluent located at adjacent corners, leading to flow short-circuiting. Since the influent has very little kinetic energy, the ultimate solution involved constructing an internal wall with small openings to promote plug flow along the reservoir length and another to effectively relocate the effluent. Flow stagnation is eliminated, but there is greater uncertainty with the proposed solution because of the low velocities. CFD is an excellent prototyping tool to cost effectively examine various possibilities to improve reservoir mixing. The results can often be used to guide the development of innovative and cost-effective solutions, but sometimes uncertain results indicate that a conservative design approach is appropriate. Includes 4 references, tables, figures.
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发布单位或类别: 美国-美国给水工程协会
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