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Computational study of aeration for wastewater treatment via ventilated pump-turbine

机译：通风水轮机曝气处理废水的计算研究

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Large eddy simulations were performed on a modular pump-turbine to study oxygen dissolution inside the draft tube. Air injection was applied over the runner cone surface during turbine operation. Data regarding bubble size, void fraction and interfacial area concentration were presented to understand their influence on oxygen dissolution. Transient single phase and multiphase flow simulations were carried out to investigate the influence of air injection and dissolution within the flow field and turbine performance. Multiphase simulations were conducted by using the mixture multiphase model. The mathematical modeling of oxygen dissolution employed was validated by comparing predicted oxygen dissolution against experimental measurements performed by Zhou et al. (2013). The averaged dissolved oxygen concentration in the range of 1.2-1.4 mg/l was obtained; which is sufficient for an active aerobic microorganism activity for wastewater treatment processes. Dissolution efficiency and the amount of averaged dissolved oxygen inside the draft tube were sensitive to the inlet bubble size. The efficiency of the dissolution increases strongly as the inlet bubble size was reduced. The obtained results revealed that vortex suppression was achieved through air admission within multiphase flow simulation. Moreover, the power generation of the turbine was hardly influenced by the aeration through the runner cone.
机译：在模块化的泵水轮机上进行了大型涡流模拟，以研究氧气在引流管内的溶解情况。在涡轮机运行期间，在转轮锥体表面上进行了空气注入。提出了有关气泡大小，空隙率和界面面积浓度的数据，以了解它们对氧溶解的影响。进行了瞬态单相和多相流动模拟，以研究空气注入和溶解对流场和涡轮性能的影响。使用混合多相模型进行了多相模拟。通过将预测的氧溶解度与Zhou等人进行的实验测量值进行比较，验证了所采用的氧溶解度的数学模型。 （2013）。得到的平均溶解氧浓度在1.2-1.4 mg / l的范围内。这足以使废水处理过程中的活性需氧微生物具有活性。引流管内部的溶解效率和平均溶解氧量对入口气泡尺寸敏感。随着入口气泡尺寸的减小，溶解效率大大提高。所获得的结果表明，通过在多相流模拟中的空气进入实现了涡旋抑制。而且，涡轮的发电几乎不受流道锥形通气的影响。

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