Ullage Tank Fuel-Air Mixture Characterisation
DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) WEAPONS SYSTEMS DIV
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This technical note discusses method development for the gas chromatographymass spectrometry GCMS vapour characterisation of Jet A-1 fuel. The vapour characterisation was conducted in the ullage the void volume above the liquid fuel. A key objective was to determine the relative headspace concentrations, of different compounds at various equilibrium temperatures. This study was conducted to further understand the mechanisms of flame propagation in fuel tank vulnerability tests under experimental conditions that reflect the field environment of aviation fuel tanks used by the Australian Defence Force ADF. The results showed that the major constituents were 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, decane and undecane. Equilibrium was reached in the system after 10 minutes of incubation regardless of the temperature.