Scholarly Research Excellence

Mohammad Taghi Shervani Tabar

Publications

2

Publications

2
480
An Experimental Study of Tip Vortex Cavitation Inception in an Axial Flow Pump
Abstract:
The interaction of the blade tip with the casing boundary layer and the leakage flow may lead to a kind of cavitation namely tip vortex cavitation. In this study, the onset of tip vortex cavitation was experimentally investigated in an axial flow pump. For a constant speed and a fixed angle of attack and by changing the flow rate, the pump head, input power, output power and efficiency were calculated and the pump characteristic curves were obtained. The cavitation phenomenon was observed with a camera and a stroboscope. Finally, the critical flow region, which tip vortex cavitation might have occurred, was identified. The results show that just by adjusting the flow rate, out of the specified region, the possibility of occurring tip vortex cavitation, decreases to a great extent.
Keywords:
Axial flow pump, Gap cavitation, Leakage vortex, Tip vortex cavitation.
1
9868
Investigation of Recirculation Effects on the Formation of Vapor Bubbles in Centrifugal Pump Blades
Abstract:
Cavitation in pumps is known as the formation of vapor bubbles due to pressure drop and collapsing these bubbles. In some conditions, it has been observed that the formation of bubbles occurs at the pressure side of centrifugal pump blades. In this study, the formation of bubbles at the pressure side of blades has been investigated. Water is used in this study as the fluid and performance curves were depicted for different flow rates in an approximately constant speed. The results show that when a centrifugal pump works in low flow rates, a secondary flow namely recirculation starts to begin. In this condition, separation of flow increases which causes vortex formation and local pressure drop and eventually the formation of vapor bubbles starts.
Keywords:
Cavitation, Centrifugal pump, Recirculation, Vapor bubble.