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

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

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

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

  4. Overview of vapor core pump Vapor core pump Dismantled components of VCP

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

  6. liquid fuel blade vapor core region interface layer Overview of vapor core pump 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 RNGk-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 Conclusions: (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 Thank you

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