1. POWER2010-27048 Eugene Chisely Antonio Campo 7/14/2010
Two Phase Flow Pump Characterization
Eugene Chisely
Antonio Campo
7/14/2010

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

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

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

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

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

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

9. Pump Single Phase Pressure Distribution1 2
+ Data
o Prediction 3
TEST matrix: N, Q
S-P Pump Models

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. 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. Pump Two Phase Flow Pump Performances1 2 3
Flow number versus Pressure Number
Inlet Diffuser -> 1.5
Impeller > 1.05
Volute > 0.75

13. Two Phase Flow Pump Performances1 2
* Data
o Prediction 3
psuction=160 kPa
Different inlet fluid pressure
psuction=185 kPa

14. Pump Two Phase Flow Performances2 1
+ Data
o Prediction 3 4

15. Two Phase Flow Pump Performances
Psuction=101:150
X=2.5*10-5:1.2*10-3
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
Psuction=200:300
X=4.5*10-5:4.5*10-3
Pump Two-Phase Flow Performance Prediction

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

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.