Ebrahim Ebrahmimi - Departement of Mechanical Engineering, Faculty of Enginering,Kermanshsh Branch, Islamic Azad University
Ali Abdulhussien Kareem - Departement of Mechanical Engineering, Faculty of Enginering,Kermanshsh Branch, Islamic Azad University
Faezeh Mohammadi - Departement of Chemical Engineering, Faculty of Enginering,Kermanshsh Branch, Islamic Azad University

Centrifugal pumps are widely used in industrial and agricultural fields (irrigation and water supply). The impeller is the main part of a pump And converts mechanical energy into hydraulic pressure. The impeller directly determines the fluid displacement capacity and hydraulic performances of the pump. Accordingly, the optimal design of the impeller is necessary and significant for have the efficient operation of the centrifugal pump thus the main purpose of this study is to investigate the changes in the wrap angle in the centrifugal pump impeller blade on pump performance. In this study, the centrifugal Ets-Norm centrifugal pump (model ۲.۵۰ / ۱۰۰, manufactured by Pumpiran Company) was investigated and analyzed. The impeller installed on the pump shaft was closed with ۵ blades and a radius of ۱۷۰ mm, the blade thickness was ۶ mm and the impeller outlet angle was ۲۰ degrees. The effect of the blade wrap angle was studied on the pump performance. The five impellers were designed with wrap angles (۱۰۰ °, ۱۰۵ °, ۱۱۰ °, ۱۱۵ ° and ۱۲۰ °). The effects of changing the wrap angle on the head, flow, efficiency and pressure distribution on the pump impeller were analyzed. The results showed that with increasing the wrap angle of the impeller blade, the amount of head and pump flow decreased and also, with increasing the wrap angle, the amount of pump efficiency decreased so that with increasing the warp angle from ۱۰۰ degrees to ۱۲۰ degrees, the amount of pump efficiency decreased by ۴.۹۳%. The results showed that with increasing the impeller wrap angle, the pressure on the blade at the fluid inlet to the impeller increased and the area under high pressure at the impeller inlet was larger than the outlet impeller.

Centrifugal Pump, CFTurbo, impeller geometry