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Simulation and Validation on Vapor Core in the Impeller Center of Vapor Core Pump
Bin WangNanjing University of Aeronautics and Astronautics, ChinaSeptember 10, 2014
2nd International Conference and Exhibition on Mechanical & Aerospace Engineering September 08-10, 2014 Philadelphia, USA
2Mech Aero-2014
Contents
Overview of vapor core pump1
Numerical model
Governing equations and flow model
Numerical results of the vapor core
Experimental verification
Conclusions and prospects
2
3
4
5
6
3Mech Aero-2014
Overview of vapor core pump
Nozzle controller of a turbofan engine
VCP
4Mech Aero-2014
Vapor core pump
Dismantled components of VCP
Overview of vapor core pump
5Mech Aero-2014
Overview of vapor core pump
sevro piston throttle valve runing impeller
VCP Schematic
6Mech Aero-2014
Vapor core photo
blade
vapor core region
interface layer
liquid fuel
Flow media in impeller
Overview of vapor core pump
How it occurs?How could it be simulated and analized?
7Mech Aero-2014
Numerical model
Geometric Model of Vapor Core Pump Structure of the Impeller
8Mech Aero-2014
Numerical model
Opening of the inlet throttle valve
2 mm 5 mm 8 mm
9Mech Aero-2014
Numerical model
Grid model for numerical calculation
10Mech Aero-2014
Governing equations and flow model
(1) Equation for vapor-liquid mixing flow
(2) momentum conservation
(3) TF Equation for vapor volume fraction distribution
11Mech Aero-2014
Governing equations and flow model
i k eff k b M ki j j
kk ku G G Y S
t x x x
2
1 3 2
i effi j j
k b
ut x x x
C G C G C R Sk k
RNG k-ε
1 23 if
3v vv l v
e vm B l
P PR P P
R
1 23 if
3v vv l v
c vm B l
P PR P P
R
1/30(3 / (4π (1 )))B v vR n
Schnerr-Sauer
12Mech Aero-2014
Numerical results of the vapor core
Vapor volume fraction distribution at different outlet pressure
13Mech Aero-2014
Numerical results of the vapor core
Performance comparison of the pump at different outlet pressure
14Mech Aero-2014
Numerical results of the vapor core
Vapor volume fraction distribution at different throttle opening
15Mech Aero-2014
Numerical results of the vapor core
Performance comparison of the pump at different throttle opening
16Mech Aero-2014
Experimental verification
Schematic diagram of the test system
17Mech Aero-2014
Experimental verification
Characteristic comparison of vapor core pump
18Mech Aero-2014
Conclusions and prospects
(1) The numerical simulation has a high credibility verified by the VCP prototype test. Errors of general performances between experiment and numerical simulation are less than 10% basically.
(2) Fuel vaporization has a significant influence on pump efficiency when the vapor region expands to the blade zone.
Conclusions:
Prospects:
Influence of the vapor core on the pump dynamic performance should be investigated to utilize the operating condition more effectively.Direct imaging technology should be employed for exact comparison of vapor core configuration.
Thank you for your attention