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CFD Analysis of Turbulent Flow Over Centrifugal Pump’s Impeller of Various Designs and Comparison of Numerical Results for Various Models
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Abstract
Turbulent flows are commonly encountered in practical applications such as water turbine, Centrifugal pump etc. It is the time-mean behavior of the flows that is usually of practical interest. Therefore, the equations for unsteady laminar flow are converted into the time-averaged equations for turbulent flow by an averaging operation in which it is assumed that there are rapid and random fluctuations about the mean value. The additional terms arising from this operation are the Reynolds stresses, turbulent heat flux, turbulent diffusion flux etc. The transition from unstable to fully turbulent flow has until now been accessible by direct numerical simulation. Experimental investigations are very difficult because the flow is particularly sensitive to unavoidable and often unknown disturbing influences which can decisively change the transition behavior.
The widespread use of turbo-machinery calls for the design of more efficient and more reliable machines, which directly translates into cost savings and better productivity. Centrifugal pump technology involves a wide spectrum of flow phenomenon and various methods of impellers design, fabrication and degree of impellers surface finishing, which has a profound impact on its performance. Numerical simulations can provide quite accurate information on the complicated fluid behavior inside the machine for various designs (blades angles) necessary for performance evaluation of a particular design. The current investigation is aimed to simulate the complex internal water flow in a centrifugal pump impeller for low specific speed (6-blades semi-shrouded) by using a (3-D) Navier-Stokes equation with various (k-ω, SST) turbulence models. The numerical solution of the deiscretized (3-D), incompressible Navier-Stokes equations over a structured/unstructured grid is accomplished with CFD package Ansys-CFX.
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