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September 08-10, 2014 Philadelphia, USA

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Presentation on theme: "September 08-10, 2014 Philadelphia, USA"— Presentation transcript:

1 2nd International Conference and Exhibition on Mechanical & Aerospace Engineering
September 08-10, 2014 Philadelphia, USA Simulation and Validation on Vapor Core in the Impeller Center of Vapor Core Pump Bin Wang Nanjing University of Aeronautics and Astronautics, China September 10, 2014 PowerPoint Template

2 Contents 1 Overview of vapor core pump 2 Numerical model 3
Governing equations and flow model 4 Numerical results of the vapor core 5 Experimental verification 6 Conclusions and prospects

3 Overview of vapor core pump
VCP Nozzle controller of a turbofan engine

4 Overview of vapor core pump
Dismantled components of VCP

5 Overview of vapor core pump
s evro piston t hrottl e valve r uning impeller VCP Schematic

6 Overview of vapor core pump
blade vapor core region interface layer liquid fuel Flow media in impeller How it occurs? How could it be simulated and analized? Vapor core photo

7 Numerical model Geometric Model of Vapor Core Pump
Structure of the Impeller

8 Numerical model Opening of the inlet throttle valve

9 Numerical model Grid model for numerical calculation

10 Governing equations and flow model
Equation for vapor-liquid mixing flow momentum conservation TF Equation for vapor volume fraction distribution

11 Governing equations and flow model
Schnerr-Sauer RNG k-ε

12 Numerical results of the vapor core
Vapor volume fraction distribution at different outlet pressure

13 Numerical results of the vapor core
Performance comparison of the pump at different outlet pressure

14 Numerical results of the vapor core
Vapor volume fraction distribution at different throttle opening

15 Numerical results of the vapor core
Performance comparison of the pump at different throttle opening

16 Experimental verification
Schematic diagram of the test system

17 Experimental verification
Characteristic comparison of vapor core pump

18 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. 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.

19 Thank you for your attention

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