Effects of Blade Discharge Angle, Blade Number and Splitter Blade Length on Deep Well Pump Performance


1 Suleyman Demirel University, Energy Systems Engineering Department, 32260 Cunur, Isparta, Turkey.

2 Pamukkale University, Automotive Engineering Department, 20017 Kinikli, Denizli, Turkey.

3 Istanbul Medeniyet University, Mechanical Engineering Department, 34730, Goztepe, Istanbul, Turkey.


Impellers with splitter blades are used for pumps and compressors in the design of turbomachines. Design parameters such as the number of blades, blade discharge angle and impeller discharge diameter impact affect pump performance and energy consumption. In this study, the effect of the number of blades (z=5, 6, and 7), blade discharge angles (β2b=25, and β2b=35) and splitter blade lengths (40, 55, 70, and 85% of the main blade length) on Deep Well Pump (DWP) performance has been studied experimentally. In the experiments, pump casing, blade inlet angle, blade thickness, blade width and impeller inlet and discharge diameters have been kept fixed while other parameters such as the number of blades, blade discharge angles and splitter blade lengths have been allowed to vary. As a result of the experimental study, the highest efficiency of all the impellers for best efficiency point (b.e.p) has been obtained on the impeller with the number of blades z=6, blade discharge angle 2b=25 and 85% splitter blade addition compared to impellers without splitter blades.