An openstyle impeller with radial blades and an opentype diffuser were designed according to the performance specifications of a submersible selfaspirating aerator to investigate the fluid flow in the aerator, and their threedimensional models have been generated in CAD codeUG. The turbulent flow through the aerator was simulated by means of CFD softwareAnsysCFX with a multiplephase turbulence flow models, and the simulated results were analyzed and confirmed by related experimental observations. The simulated results showed that when the submersed depth of the aerator was increased to 6.5 m from 2.5 m, the flow patterns in the aerator experienced three changes, such as chaos, smooth and chaos again, accordingly the lowest pressure zone appeared, disappeared and reappeared as well. The experimental data exhibited that when the submersed depth of the aerator was increased to 6.5 m from 2.5 m, the air in the suction pipe got the highest velocity of 4.25 m/s at the 3.5m submersed depth. A similar air velocity in the suction pipe was achieved too. This suggests that predicting performance of aerator by means of CFD method is feasible.
Shi Huiming, Liu Yanchen, Shi Hanchang, et al. CFD simulation and performance comparison of surface aerator for deep aeration[J]. Chinese Journal of Environmental Engineering, 2008, 2(2):154-159. (in Chinese)
Huang Si, Wang Hongjun, Zheng Maoxi. Numerical analysis of gasliquid twophase flow in multiphase rotodynamic pump and pump performance[J]. Journal of South China University of Technology: Natural Science Edition, 2007,35(12):11-16. (in Chinese)