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Modelling and Simulation in Engineering
Volume 2016 (2016), Article ID 4729128, 11 pages
http://dx.doi.org/10.1155/2016/4729128
Research Article

Studies of Two-Phase Flow at a Chute Aerator with Experiments and CFD Modelling

1Hydraulic Engineering, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden
2Fluid Mechanics, Vattenfall R&D, 814 70 Älvkarleby, Sweden
3Civil Engineering, Haute Ecole d’Ingénierie et d’Architecture de Fribourg (HEIA-FR), 1705 Fribourg, Switzerland
4Laboratory of Hydraulic Constructions, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland

Received 17 May 2016; Accepted 25 July 2016

Academic Editor: ShengKai Yu

Copyright © 2016 Penghua Teng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The chute aerator of a spillway is a structure in such a sense that air is, in the intense emulsification, entrained into the high-velocity water flow. Correctly predicting the air entrainment and two-phase flow pattern at the aerator would contribute to reliable spillway operation. Based on experimental data, 2D numerical simulations are preformed to predict streamwise air concentrations in the aerated flow, in which a two-fluid model is used. Depending on the air bubble size, relatively good agreement is seen with the experiments in the air cavity zone. The simulations give rise to higher air concentration downstream of the cavity, which is presumably due to underestimation of the interfacial forces in the two-fluid model.