The performance and flow of centrifugal pump by varying exit blade angleis usually investigated experimentally. However, due to the high cost and limited data that can be obtained by experiment, currently there is a great need for this effect to be studied numerically by means of computational fluid dynamics (CFD). Here in this work, the impeller model of a submersible pump has been analysed analytically by vaying the exit blade angle. The specification of a commercially available pump in the market is taken as the reference for the study which  is 49°.Now we consider two impeller model whose exit blade angle is decreased (model 1) and increased (model 2) by 50 to the reference pump. For these two model an analysis is done by using same Computational Fluid Dynamics (CFD) software and it the results shows that the hydraulic efficiency of model 1 as 67.12%  and  model 2 as 83.35%. It has been seen that by increasing the exit blade angle, the hydraulic efficiency of the impeller gets increased but the pressure head range of the impeller is decreased.

Keywords: Centrifugal Pump, Impeller, blade angle, CFD, hydraulic efficiency