Motor/ Centrifugal Pump Performance Jerry Bird Pumps The University of Akron System Designers Alan Jennings Assisted by Mike Coe, Touby Khamphilapanyo & Kevin Tansey

Outline Background Results The experiment The calculations Performance Minor loss System Resistance Results Head Efficiency System Resistance The experiment The calculations

Pump Performance Chart shows consumers what to expect Pressure & flow rate for a pump speed Souped up Curves! Convenient Speeds Constant Efficiency Lines Constant Brake Horsepower Lines

Minor Loss Validation Major Losses due to Frictional Flow Minor Losses Due to frictional, fully-developed flow Increases with fluid speed, roughness, viscosity, and reduced size Minor Losses Due to friction with flow changes I.e. Elbows, pipe reductions, valves Changes with geometry, size, fluid speed, Reynolds's # Major losses are fairly well described For minor losses, 10% is good approximation.

System Resistance Curve The required pump head for given flow rate Composed with system’s Major & minor losses Elevation & pressure change Needed for sizing systems Used with pump performance curve Operating Point System Resistance Curve

Motor/Pump Performance Chart Insert Chart Here

Pump Efficiency Comparison Pump Maximum Efficiency 77% 1750 Rpm, 60 gpm, 34 ft head Maximum efficiency 86% For similar pumps This pump

Elbows, Flow Meter & Expansion Minor Losses Verified Overall Resistance Elbows, Flow Meter & Expansion (4.4 to 5.3) Globe Valve (6.4 to 7.8) 5.2 4.8 Could have variation due to exit of pump for pressure tap location

Composing Chart Planned and conducted experiment Head versus flow rate Pressures for minor loss calculations Electrical reading for power calculations Make sure we took enough data. Verified Instrumentation, that we wouldn’t damage the pressure transducer. Why we chose the pressure tap locations Including orifice to increase pressure in top branch, to eliminate air

Dimensionless Analysis Head Coefficient function of  Flow coefficient  Machine Reynolds's # One suspect point, could have other effects happening, within uncertainty of measurements

Dimensionless Analysis Efficiency function of  Flow coefficient  Machine Reynolds’s # η =C1 φ² +C2 φ

Dimensionless Analysis Results

Thank you! Questions? Calculations Uncertainty Sensor Safety Equipment

Uncertainty Pressure sensors Dimensions Alignment Rust…

Calculations Total Head rise Dimensionless Groups Fluid Power Pressure Coefficient Flow Coefficient Dimensionless Correlations Fluid Power Efficiency

Sensor Safety Centripetal Acceleration over area Integrating

Equipment Pressure gages across pump Pump and motor Pressure transducer 3” Globe valve Exit into tank and orifice plate Rusty 3” pipe