1 / 29

ME 388 – Applied Instrumentation Laboratory Centrifugal Pump Lab

ME 388 – Applied Instrumentation Laboratory Centrifugal Pump Lab. References. Streeter and Wylie, Fluid Mechanics (Ch.10) Holman, Experimental Methods for Engineers , (Ch.6) Munson (Ch.9) Any Fluid Mechanics book. Lab Objectives. Understand operation of a dc motor

shirlyn
Télécharger la présentation

ME 388 – Applied Instrumentation Laboratory Centrifugal Pump Lab

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ME 388 – Applied Instrumentation LaboratoryCentrifugal Pump Lab

  2. References • Streeter and Wylie, Fluid Mechanics (Ch.10) • Holman, Experimental Methods for Engineers, (Ch.6) • Munson (Ch.9) • Any Fluid Mechanics book

  3. Lab Objectives • Understand operation of a dc motor • Analyze fluid flow using • Centrifugal pump • Venturi flow meter • Evaluate pump performance as a function of impeller (shaft) speed • Develop pump performance curves • Assess efficiencies

  4. Lab Set-up

  5. dc motor • Armature or rotor • Commutator • Brushes • Axle • Field magnet • DC power supply Figure 1. dc motor (howstuffworks.com)

  6. http://www.cheresources.com/centrifugalpumps1.shtml Centrifugal pump

  7. http://www.pumpworld.com/contents.htm

  8. Cavitation

  9. Centrifugal pump operation • Rotating impeller delivers energy to fluid • Governing equations or Affinity Laws relate pump speed to: • Flow rate, Q • Pump head, Hp • Fluid power, P

  10. Pump Affinity Laws • N  Q • N2  Hp • N3  P

  11. Determination of Pump Head

  12. Determination of Flow Rate • Use Venturi meter to determine Q • Fluid is incompressible (const.  ) • Q = Vfluid Area

  13. Venturi Meter • As V, kinetic energy  • T = 0 •  Height = 0 • Pv or P 

  14. Calculate Q from Venturi data • V1 = inlet velocity • V2 = throat velocity • A1 = inlet area • A2 = throat area

  15. Throat Velocity

  16. Discharge Coefficient

  17. Solve for Q • Use MS EXCEL (or Matlab) • Calculate throat velocity • Calculate discharge coefficient using Reynold’s number and throat velocity • Calculate throat area • Solve for Q

  18. Power and Pump Efficiency • Assumptions • No change in elevation • No change in pipe diameter • Incompressible fluid • T = 0 • Consider 1st Law (as a rate eqn.)

  19. Pump Power Derivation

  20. Efficiencies

  21. Summary of Lab Requirements • Plots relating Hp, P, and pump to Q • Plot relating P to pump • Regression analyses • Uncertainty of overall (requires unc. of Q) • Compare Hp, P, Q for two N’s • For fully open valve position • WRT affinity laws

  22. Start-up Procedure • Fill pvc tube with water (3/4 full) • Bleed pump • Switch breaker to “on” • Push main start button • Make sure variac is turned counterclockwise • Make sure throttle valve is fully open • Turn lever to “pump” • Push “reset” button • Push “start” button • Adjust variac to desired rpm using tach.

  23. Pump lab raw data

  24. Shut-down Procedure • Fully open throttle valve • Turn variac fully counterclockwise • Push pump stop button • Turn pump lever to “off” • Push main stop button • Switch breaker to “off”

More Related