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| Numerical study on hydraulic performance of submerged propellers in oxidation ditch |
| Wu Siyuan, Zhou Daqing, Zheng Yuan |
| College of Energy and Electrical Engineering, Hohai University, Nanjing, Jiangsu 210098, China |
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Abstract The submerged propeller is an efficient diving mix device, which is applicable for oxidation ditch treatment in industry, city and village wastewatertreatment plant. The impeller structure and reasonable rotating speed are important factors that determine flow field distribution and energy conversion efficiency. So it is necessary to use modern design methods to develop new kinds of high efficiency submerged propellers, and research the flow field characteristics of submerged propellers. On the basis of the existing form drawing, threedimensional model of submerged propellers and unstructured tetrahedral mesh were generated. Based on Navier-Stokes equations and standard k-ε turbulence model, the flow was simulated by using a simple algorithm. Through changing some design parameters of propellers, the corresponding numerical simulation results reveal that for the same impeller diameter and service area of submerged propellers, the power consumption could be reduced effectively by optimizing blade mounting angle, which can determine the best blade mounting angle and most suitable rotational speed under given conditions. The study can provide theoretical and project guidance for submerged propellers design.
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Received: 15 September 2012
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