Swiss Federal Institute of Aquatic Science and Technology, Eawag, Dübendorf, Switzerland.
Water Res. 2011 Jan;45(2):810-8. doi: 10.1016/j.watres.2010.09.009. Epub 2010 Sep 17.
Due to the high energy input of aeration, the spatial distribution of air diffusers largely determines the flow field in aeration tanks. This has consequences on the efficiency of the aeration system, the performance of the aeration tank and on tank operation and control. This paper deals with these effects applying both Computational Fluid Dynamics (CFD) enhanced with a biokinetic model and full scale validation using velocity and reactive tracer measurements with high temporal and spatial resolution. It is shown that small changes in the diffuser arrangement drastically change the overall flow field. Using different aeration patterns in the same tank may lead to large scale instabilities in the flow field that lower plant performance and produce strong variations in concentration signals impeding their use for plant control. CFD is a valuable tool to analyze the interaction of flow field and aeration and their effects on plant performance and operation. But, in complex flow situations experimental validation is needed and strongly suggested.
由于曝气需要大量的能量输入，因此空气扩散器的空间分布在很大程度上决定了曝气池中的流场。这会对曝气系统的效率、曝气池的性能以及池的运行和控制产生影响。本文通过应用计算流体动力学（CFD）并结合生物动力学模型以及使用具有高时间和空间分辨率的速度和反应示踪剂测量进行全尺度验证来处理这些影响。结果表明，扩散器布置的微小变化会极大地改变整个流场。在同一池中使用不同的曝气模式可能会导致流场的大规模不稳定性，从而降低工厂的性能，并产生强烈的浓度信号变化，从而阻碍它们用于工厂控制。CFD 是分析流场和曝气相互作用及其对工厂性能和运行影响的一种有价值的工具。但是，在复杂的流动情况下，需要进行实验验证，并强烈建议进行实验验证。
Zotero 插件