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Experimental Study on Jet-A Vaporization in Aircraft Fuel Tank

Analysis of Jet-A vaporization in experimental tank at varying pressures, using computational model to predict vapor composition. Experimental data on hydrocarbon concentrations and temperatures inputted for comparison. Setup includes tank, sample ports, and analysis tools.

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Experimental Study on Jet-A Vaporization in Aircraft Fuel Tank

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  1. Robert Ian Ochs Rutgers, The State University of New Jersey International Aircraft Systems Fire Protection Working Group Meeting Atlantic City, New Jersey November 5, 2003 Jet-A Vaporization In an Experimental TankPart II: Experimental Results at Atmospheric and Sub-Atmospheric Pressures

  2. Fuel Flammability Prediction • Computational model written by Professor Polymeropoulos of Rutgers University • Uses principles of heat and mass transfer to predict vapor composition

  3. Overview • Fuel vaporization experimentation is performed at W.J.H. Technical Center at Atlantic City Airport, NJ • Experimental data consists of hydrocarbon concentrations and temperatures as functions of time • Data is input into computer model and compared to calculated vapor composition

  4. Model Inputs • Liquid fuel, tank surface temperature profiles • Pressure and outside air temperatures as functions time • Fuel composition (volume fractions of C5-C20 Alkanes) from Woodrow (2003) • Tank dimensions and fuel loading

  5. Model Outputs • Hydrocarbon concentration profile • Ullage temperature profile

  6. Experimental Setup • Fuel tank – 36”x36”x24”, ¼” aluminum • Sample ports • Heated hydrocarbon sample line • Pressurization of the sample for sub-atmospheric pressure experiments • Intermittent (at 10 minute intervals) 30 sec long sampling • FID hydrocarbon analyzer, cal. w/2% propane • 12 thermocouples • Blanket heater for uniform floor heating • Unheated walls and ceiling • JP-8 Fuel

  7. Experimental Setup (continued) • Fuel tank inside environmental chamber • Programmable variation of chamber pressure and temperature using: • Vacuum pump system • Air heating and refrigeration system

  8. Experimental Setup (continued)

  9. Thermocouple Locations

  10. Experimental Procedure • Fill tank with specified quantity of fuel • Adjust chamber pressure and temperature to desired values, let equilibrate for 1-2 hours • Begin to record data with DAS • Take initial hydrocarbon reading to get initial quasi-equilibrium fuel vapor concentration • Set tank pressure and temperature as well as the temperature variation • Experiment concludes when hydrocarbon concentration levels off and quasi-equilibrium is attained

  11. Experimental Results-Sea Level

  12. Experimental Results-10,000 ft.

  13. Experimental Results-20,000 ft.

  14. Experimental ResultsPressure and Temperature Variation

  15. Experimental Results-Hydrocarbon Profiles

  16. Conclusions and Future Work • Complete verification at lower pressures (6.9 psia and below) • Use existing flight data to simulate entire flight profiles

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