centrifugal pump performance experiment
TRANSCRIPT
7/29/2019 Centrifugal Pump Performance Experiment
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Centrifugal Pump
Performance Experiment
Presented by: Steven King
ME 498 Senior lab
November 16, 2004
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Overview of Presentation
Objectives
Methodology and Background
Experimental Setup
Discussion of Results
Conclusions and Recommendations
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Objectives
Become familiar with centrifugal pump
operation
Analyze the principles of fluid flow at5 different shaft speeds
Evaluate pump performance
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Methodology and Background
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
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Methodology and Background
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)
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Experimental Setup
Overall System Schematic
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Experimental Setup Cont.
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Experimental Setup Cont.
= 1.5 in= 2 in
Venturi Flow Meter
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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
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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
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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
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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
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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
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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