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The flow simulation of a low-specific-speed high-speed centrifugal pump
Authors:B Jafarzadeh  A Hajari  MM Alishahi  MH Akbari
Institution:1. High Performance Computing Center (HPCC), Department of Mechanical Engineering, School of Engineering, Shiraz University, Shiraz, Iran;2. Advanced Materials Research Center (AMRC), Materials & Metallurgical Engineering Department, Iran University of Science & Technology (IUST), Tehran 16844-1314, Iran
Abstract:In this paper a general three-dimensional simulation of turbulent fluid flow is presented to predict velocity and pressure fields for a centrifugal pump. A commercial CFD code was used to solve the governing equations of the flow field. In order to study the most suitable turbulence model, three known turbulence models of standard kε, RNG and RSM were applied. The complex flow configuration required us to use around 5,800,000 cells, and 12 computational nodes (processors) for parallel computing. Simulation results in the form of characteristic curves were compared with available experimental data, and an acceptable agreement was obtained. Additionally, effect of number of blades on the efficiency of pump was studied. The number of blades was changed from 5 to 7. The results show that the impeller with 7 blades has the highest head coefficient. Finally, it was observed also that the position of blades with respect to the tongue of volute has great effect on the start of the separation. Thus, to analyze the effect of blade number on the characteristics of the pump, the position of blade and tongue should be similar to each other. Investigations of this kind may help to reduce the required experimental work for the development and design of such devices.
Keywords:Centrifugal pump  Turbulence modeling  CFD  Inducer
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