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The current investigation is aimed to simulate the complex internal flow in     a centrifugal pump impeller with six twisted blades by using a three-dimensional     Navier-Stokes code with a standard k-ε two-equation turbulence model. Different flow rates were specified  at inlet boundary to predict the characteristics of the pump. A detailed analysis of  the results at design load, Qdesign, and off-design conditions, Q = 0.43 Qdesign and Q = 1.45 Qdesign, is presented. From the numerical simulation, it shows that  the impeller passage flow at design point is quite smooth and follows the curvature  of the blade. However, flow separation is observed at the leading edge due to nontangential  inflow condition. The flow pattern changed significantly inside the volute as well, with double  vortical flow structures formed at cutwater and slowly evolved into a single vortical structure   at the volute diffuser. For the pressure distribution, the pressure  increases gradually along streamwise direction in the impeller passages. When  the centrifugal pump is operating under off-design flow rate condition, unsteady flow  developed in the impeller passage and the volute casing

Numerical Flow Simulation in a Centrifugal Pump at Design and Off-Design Conditions