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Dimensional modelling of the fuel outgassing phenomenon: Improving flammability assessment of aircraft fuel tanks

Published online by Cambridge University Press:  27 January 2016

A. P. Harris  and
N. M. Ratcliffe
A. P. Harris*
Affiliation:
Airbus, EV Flight and Integration Test Centre, Bristol, UK
N. M. Ratcliffe
Affiliation:
Centre for Research in Analytical, Materials and Sensor Science, University of the West of England, Bristol, UK
*
adam.harris1@virgin.net
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Abstract

Fuel outgassing (oxygen evolution) within aircraft fuel tanks presents a serious flammability hazard. Time constants representing oxygen transfer rate, from the fuel into a tank’s ullage, are used to model the effect of outgassing on tank flammability. These time constants are specific to a single aircraft type and flight envelope and may not accurately represent fuel outgassing behaviour for other aircraft types with differing fuel tank configurations and flight envelopes. To improve current modelling practice for more accurate flammability analysis dimensional modelling has been used to determine the rate of oxygen evolution from Jet A-1 fuel in an aircraft fuel tank. Measurements of oxygen evolution rate, made on a dimensionally similar model, have been projected to an A320 aircraft. The evolution of oxygen from the fuel was found to increase monotonically with time. Fitting the test data with an inverse-exponential function enabled oxygen release rate and its associated time constant (τ) to be determined. Dimensional modelling of aviation fuel outgassing using model fuel tanks will enable oxygen evolution rate from aviation fuel to be determined for a wide range of aircraft fuel tank configurations and environments without the need for flight testing. In turn the accuracy of flammability assessment of aircraft fuel tanks will be improved and significant cost savings made.

Type
Research Article
Information
The Aeronautical Journal , Volume 115 , Issue 1172 , October 2011 , pp. 605 - 614
Copyright
Copyright © Royal Aeronautical Society 2011 

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References

1. Kosvic, T., Zung, L.B. and Gerstein, M. Analysis of Aircraft Fuel Tank Fire and Explosion Hazards, AFAPL-TR-71-7, 1971.Google Scholar
2. Coordinating Research Council. Handbook of Aviation Fuel Properties, CRC Report No. 635,2004.Google Scholar
3. Summer, S.M. Fuel Tank Flammability Assessment Method User’s Manual, DOT/FAA/AR-05/8 Final Report, 2008.Google Scholar
4. Schweitzer, P.H. and Szebehely, V.B. Gas evolution in liquids and cavitation, J Appl Phys, December 1950, 21, pp 1218–1224.Google Scholar
5. Szirtes, T. Applied Dimensional Analysis and Modeling (2nd ed), Elsevier, Toronto, Canada, 2006.Google Scholar
6. Ross, K. Air Release from Supersaturated Aircraft Fuel, K.195, 1972.Google Scholar
7. Buckingham, E. On Physically Similar Systems, Physical Reviews 1914, 4, p 345.Google Scholar
8. Ward, I.P. Software Report on 321SYS4, A321/B81-01/336/SDF/B81-01/GEN/61/1941,1993.Google Scholar
9. Paul, E.L., Atiemo-Obeng, V.A. and Kresta, S.M. Handbook of Industrial Mixing, Science and Practice, Wiley-Interscience, 2004.Google Scholar
10. Post, T. Personal Communication, Post Mixing Optimization and Solutions, 2010.Google Scholar
11. Weetman, R.J. and Oldshue, J.Y. Comparison of Mass Transfer Characteristics of Radial and Axial Flow Impellers, 6th European Conference on Mixing, Pavia, Italy, ISBN 0 947711 33 3, 24-26 May 1988Google Scholar
12. ASTM, Standard Test Method for Estimation of Solubility of Gases in Petroleum Liquids, D2779-92,2002.Google Scholar
13. Haynes, J. Personal communication, Cadre Analytic, 2010.Google Scholar
14. Bedwell, M.E. Rate of release of dissolved air, oxygen and nitrogen from kerosine during flight, Technical Memo No Chem, 82, 1952.Google Scholar
15. Roth, A.J. Development and Evaluation of Airplane Fuel Tank Ullage Composition Model, Volume II – Experimental Determination of Airplane Fuel Tank Ullage Compositions, AFWAL-TR-87-2060, 1987.Google Scholar