CE 356 Elements of Hydraulic Engineering Dr. Ben R. Hodges University of Texas at Austin Pumps

Radial flow centrifugal pumps fluid enters at the central axis, then accelerates perpendicular to the axis 11/20/2018

Spinning the flow adds velocity. acceleration impeller Spinning the flow adds velocity. Why does the exit diameter slowly increase around the impeller? 11/20/2018

Mixed flow are a combination of radial and axial flow axial and mixed flow Axial flow pumps accelerate the flow directly across the axis (i.e. a fan or propeller) Mixed flow are a combination of radial and axial flow 11/20/2018

efficiency contours 11/20/2018

system curve So the system curve must be a quadratic increase in head loss with increasing discharge jargon 11/20/2018

Possible operating points selection Pump selection diagram shaft hp impeller diameter efficiency contours System curve impeller speed Possible operating points 11/20/2018

selection Figure 15.15 11/20/2018

NPSH How high can a pump suck? 11/20/2018