centrifugal pump performance experiment

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Centrifugal Pump

Performance Experiment

Presented by: Steven King

ME 498 Senior lab

November 16, 2004



Overview of Presentation

Objectives

Methodology and Background

Experimental Setup

Discussion of Results

Conclusions and Recommendations



Objectives

Become familiar with centrifugal pump

operation

Analyze the principles of fluid flow at5 different shaft speeds

Evaluate pump performance




Key Equations

eD

d R

BC 53.6907.0

41

2

PC V d t

t t d V AC Q

Assumptions: Β= .75, ρ=998, and μ=9.55x10-4

ΔP and was recorded during experiment.

12

21

2212

2 Z Z

g

V V

g

PP Hp

1

2

DV Rt

ED

(1)

(2)

(3)

(4)

(5)

0




Cont.

Affinity Laws

1

2

12

N N QQ

2

1

2

12

N

N Hp Hp

3

1

2

12

N N PP

Key Equations Continued

12 PPQW pump

T

PPQ pump

12

(6) (7)



Experimental Setup

Overall System Schematic



Experimental Setup Cont.



Experimental Setup Cont.

= 1.5 in= 2 in

Venturi Flow Meter



Results Uncertainty Values for Experiment

wQ = 38.0%

w η = 39.7%

Affinity Law Results Value found

fromExperiment

CalculatedUsing Affinity

Laws%

Difference

1165 RPM

Q (m3/s) 5.61E-03 5.30E-03 5.55

P (W) 435.8 470.8 7.43

Hp (m) 7.92 9.06 12.58

1530 RPM

Q (m3/s) 7.49E-03 6.96E-03 7.12

P (W) 906.1 1066.4 15.03

Hp (m) 12.33 15.6 20.96



Results Cont.Pump Head vs. Flow Rate

y = -130514x2

+ 273.53x + 17.664

R2

= 0.999

y = -109848x2

+ 75.198x + 14.49

R2

= 0.9972

y = -123314x2

+ 197.32x + 10.708

R2

= 0.9945

y = -37652x2

- 285.26x + 8.3396

R2

= 0.9714

y = -54121x2

- 192.77x + 7.0513

R2

= 0.9559

0

2

4

6

8

10

12

14

16

18

20

1.5E-03 2.5E-03 3.5E-03 4.5E-03 5.5E-03 6.5E-03 7.5E-03 8.5E-03

Flow Rate (m^3/s)

P u m p H e a d ( m

)

900.2 RPM

992.8 RPM

1165 RPM

1352 RPM

1530 RPM



Results Cont.Pump Efficiency vs. Flow Rate

y = -9353.1x2 + 165.91x - 0.0087

R2

= 0.9985

y = -19075x2

+ 183.32x + 0.0023

R2

= 0.9955

y = -9886.8x2

+ 151.87x - 0.0003

R2

= 0.9989

y = -15032x2

+ 166.37x - 0.0027

R2

= 0.9987y = -15468x

2+ 165.33x + 0.0014

R2

= 0.9976

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.0E+00 1.0E-03 2.0E-03 3.0E-03 4.0E-03 5.0E-03 6.0E-03 7.0E-03 8.0E-03

Flow Rate (m^3/s)

P u m p E f f i c i e n c y

900.2 RPM

992.8 RPM

1165 RPM

1352 RPM

1530 RPM



Results Cont.Pump Efficiency vs. Pump Power to Fluid

y = -4E-08x2

+ 0.0008x + 0.0009

R2

= 0.9999

y = -1E-06x2

+ 0.0015x - 0.0017

R2

= 0.9988

y = -2E-06x2

+ 0.0021x - 0.0003

R2

= 0.9996

y = -3E-06x2

+ 0.0027x + 0.0008

R2

= 0.9985

y = -2E-07x2

+ 0.001x + 0.0032

R2

= 0.9992

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0 100 200 300 400 500 600 700 800 900 1000

Pump Power (Watts)

P u m p E f f i c i e n

c y

900.2 RPM992.8 RPM

1165 RPM

1352 RPM

1530 RPM



Results Cont.Pump Power to Fluid vs. Flow Rate

y = -1E+07x2

+ 214130x - 15.3R

2= 0.9978

y = -1E+07x2

+ 168878x - 8.0432

R2

= 0.9984

y = -8E+06x2

+ 126678x - 4.5836

R2

= 0.9983

y = -5E+06x2

+ 85850x - 0.3415

R2

= 0.999

y = -5E+06x2

+ 73781x - 0.2309

R2

= 0.999

0

100

200

300

400

500

600

700

800

900

1000

0.0E+00 1.0E-03 2.0E-03 3.0E-03 4.0E-03 5.0E-03 6.0E-03 7.0E-03 8.0E-03

Flow Rate (m^3/s)

P u m p P o w e r ( W a t t s )

900.2 RPM

992.8 RPM

1165 RPM

1352 RPM

1530 RPM



Conclusions and Recommendations

All R 2 were above .95 with most being above .99

The best overall efficiency was approximately

70% for an RPM of 1530

The use of pressure gauges and dynamometer

that are less affected by vibration would improve

results

A more accurate method of recording voltage

and current would also improve the results

centrifugal pump performance experiment

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