1 / 17

December 11th-12th, 2000 International Aircraft Systems Fire Protection Working Group

NEA Ullage Washing Testing With a Vented Fuel Tank. December 11th-12th, 2000 International Aircraft Systems Fire Protection Working Group. Outline. Background Ullage Washing Data Model Validation Hydrocarbon Effects Data Temperature Effects Data. Background.

xuxa
Télécharger la présentation

December 11th-12th, 2000 International Aircraft Systems Fire Protection Working Group

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. NEA Ullage Washing Testing With a Vented Fuel Tank December 11th-12th, 2000International Aircraft Systems FireProtection Working Group AAR-422 Fire Safety R&D

  2. Outline • Background • Ullage Washing Data • Model Validation • Hydrocarbon Effects Data • Temperature Effects Data AAR-422 Fire Safety R&D

  3. Background • Obtained Nitrogen Supply System from Air Liquide to Examine Fuel Tank Ullage Washing • Utilized Existing Test Article • Primary Task is to Characterize the Ability of Nitrogen to Inert an Empty Fuel Tank • Effective of Nitrogen Purity, Flow Rate • Effective Ullage Temperature / Hydrocarbon Concentration • Develop Empirical Relationships and Varify Existing Models AAR-422 Fire Safety R&D

  4. AAR-422 Fire Safety R&D

  5. AAR-422 Fire Safety R&D

  6. Nondimensional Time • Want to Express Time in Terms of Volume Delivered • Volumetric Tank Exchange = Time * Volume Flow Rate / Total Tank Volume • Should Allow for Comparison of Data with Different Parameters, Regardless of Volume Flow Rate AAR-422 Fire Safety R&D

  7. AAR-422 Fire Safety R&D

  8. AAR-422 Fire Safety R&D

  9. Nondimensional Oxygen Concentration • Want to Express [O2] in Terms of Purity Delivered. Consider that Gas is Slowly Changing the Ullage to Gas Purity • Tank Inertion Ratio = Air[O2] - Tank[O2] / Air[O2] - NEA[O2] • Should Allow for Comparison of Data with Different Parameters, Regardless of Purity AAR-422 Fire Safety R&D

  10. AAR-422 Fire Safety R&D

  11. Comparison of Data with Solutions • Empirical Equation (fourth order polynomial) Based on Previous Graph • ANM-100 Model (Ivor Thomas) • Based on O2 Volume Exchange • Gives One Nondimensional Solution • Exact Solution Based on Perfect Mixing Model (y = 1 - e-λt ) • Results Compare Well AAR-422 Fire Safety R&D

  12. AAR-422 Fire Safety R&D

  13. AAR-422 Fire Safety R&D

  14. Effects of Ullage Temperature / [THC] • Performed Several Tests Varying Tank Ullage Temperature and Total Hydrocarbon Concentration • Used Hot Plate Element, Kerosene Heater, and Liquid CO2 • Final Results Show Little Effect on Time to Inert AAR-422 Fire Safety R&D

  15. AAR-422 Fire Safety R&D

  16. AAR-422 Fire Safety R&D

  17. Future Work • Continue with Re-circulate and Replace Work and Quantify Benefit • Extrapolate Requirements for an On-Aircraft System and Determine Preliminary Cost/Ben • Work with Manufacturers to Develop Innovative Designs to Cut Cost/Weight/Size AAR-422 Fire Safety R&D

More Related