Effect of Impeller Blade Exit Angle on the Performance of Centrifugal Pump

-Changing some geometric characteristic of the impeller in centrifugal pumps improves their performance. It is known that blade exit angle plays very important role in the performance of a centrifugal pump. To investigate effect of blade exit angle on the performance of centrifugal pump by means of experiment is very expensive and lengthy process. Due to expensive and lengthy process, it can be obtained by using mathematical model. In the present study three pumps of different specific speeds are taken for the investigation. Initially mathematical model presented by Gulich [1] is validated with manufacturer’s head-flow curve and then it is used to investigate the effect of blade exit angle. It is seen that the Gulich [1] model is in very good agreement with the manufacturer’s head-flow curve. Moreover the blade exit angle has significant effect on the head and the efficiency of the centrifugal pump. It is found from this investigation, both head and efficiency of centrifugal pump increases with increasing in blade exit angle. Keywords— Centrifugal pump, Blade exit angle, Head, Efficiency, Performance