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

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

3. 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

4. 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.

5. 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

6. Motor/Pump Performance Chart
Insert Chart Here

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

8. 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

9. 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

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

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

12. Dimensionless Analysis Results

13. Thank you!
Questions?
Calculations
Uncertainty
Sensor Safety
Equipment

14. Uncertainty
Pressure sensors
Dimensions
Alignment
Rust…

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

16. Sensor Safety
Centripetal Acceleration over area
Integrating

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