This document summarizes experimental work characterizing the performance of a two-phase flow pump. It describes the experimental loop used to test the pump under single-phase and two-phase flow conditions. The document also outlines instrumentation used to measure pump parameters like pressure, void fraction, and flow rates. Charts show experimental data on the pump's pressure distribution and performance at varying flow rates, pressures, and void fractions, along with comparisons to predictive models of single-phase and two-phase pump behavior. The conclusion calls for more experiments to develop more accurate predictive models of two-phase pump performance.

1. 1
Two Phase Flow Pump Characterization
Eugene Chisely
05/06/2011

2. 2
Agenda:
•Experimental Loop
•Single-Phase Pump
Performance
•Two-Phase Flow Pump
Characterization
Partially Shrouded Open Impeller
•Pressure distribution
•Optical inspection of flow
Introduction
D1=10”
D2=3.38”
β1=71°
β2=17°

3. 3
Two Phase Flow Pump Characterization
Two-Phase Flow Experiment Loop (Schematic)
PUMP TWO PHASE EXPERIMENT (Lillibridge Engr. Lab. ISU)

4. 4
Experimental Loop
Primary
Separator
Tank
Secondary
Separator Tank
Loop
Pump
Pump Suction Pipe
Air Pipe
Mixer

5. 5
Test Pump Instrumentation
Pump
Torque & Speed Meter
6 beam Densitometer
Optical Probes
DP Cells

6. 6
Test Pump Instrumentation
Optical Probe Ports
Pressure Probe Ports
•Followed the line bisecting the distance between two vanes
•0.03” hypodermic tubes (filtered pressure oscillation)

7. 7
Test Pump Instrumentation
6-Beam low gamma & x-Ray attenuation densitometer
Schematic of 6-Beam
Densitometer
Source
Detectors
collimators
Body
Cover
plate
collimators
sleeves

8. 8
Test Pump Instrumentation
Fluid pressure measurement arrangement through the pump
flow passages.

9. 9
Pump Single Phase Pressure Distribution
1 2
3
+ Data
o Prediction
TEST matrix: N, Q
S-P Pump Models

10. 10
Pump Single Phase Calculation
Input:
Impeller geometry: r1 [m],r2 [m], β’s
Suction pipe diameter: dpipe [m] ,
Volumetric flow rate: Q [liter/minute]
Water density (ρsp)
Pump Single-Phase Flow
Performance Prediction.

11. 11
Pump Two Phase Flow Pump Performances
Two-phase flow mass flux effect
N=1250 rpm, psuction=130 [kPa]
The effect of different suction
pressure on pump head.
Preliminary Test Result:
Void Fraction
Pump Suction Pressure
Test Matrix:
N, QW,Qair, Psuction

12. 12
Flow number versus Pressure Number
Inlet Diffuser -> 1.5
Impeller -> 1.05
Volute -> 0.75
1
3
2
Pump Two Phase Flow Pump Performances

13. 13
Two Phase Flow Pump Performances
Different inlet fluid pressure
psuction=160 kPa
psuction=185 kPa
1
3
2
* Data
o Prediction

14. 14
Pump Two Phase Flow Performances
+ Data
o Prediction
1 2
43

15. 15
Two Phase Flow Pump Performances
Input:
Suction Pressure: psuction [kPa]
Two-Phase Flow Quality: x
S-P Water Flow Rate: m [kg/sec]
S-P pump pressure Distribution:
•Inlet Diffuser
•Pump Vane
•Pump Volute
Pump Two-Phase Flow
Performance Prediction
Psuction=101:150
X=2.5*10-5:1.2*10-3
Psuction=200:300
X=4.5*10-5:4.5*10-3

16. 16
A B
DC
pressure
side
pressure
side
pressure
side
pressure
side
suction
side
suction
side
suction
side
suction
side
CONCLUSION
Two-phase flow regime in the vane flow
passage versus void fraction.
Pressure distribution along the vane flow
passage versus void fraction.
*Inlet diffuser
o First third of vane
+ Second Third
. Last section of vane
Two mechanism:
•Low Void fraction: chapping effect of Vane
•High void fraction: Intensive centrifuge field

17. 17
CONCLUSION
•Single & Two Phase Flow Experiment
•Single & Two-Phase Models Were Developed
•Compared Them With Experimental Data Point
Recommendation:
More experimental work needed to develop more
accurate models to predict pump two-phase flow
pump performance for both condensable and un-
condensable fluids.