Sub-millimeter sized multi-component jet fuel surrogate droplet combustion: Physicochemical preferential vaporization effects
نویسندگان
چکیده
Isolated droplet burning behaviors of fuel mixtures that all share the fully pre-vaporized combustion same “global” Jet-A real are investigated numerically to elucidate effects preferential vaporization. Predictions generated using three such multi-component hydrocarbon (Mixture-1: n-decane/iso-octane/toluene 42.7/33.0/24.3, Mixture-2: n-dodecane/iso-octane/1,3,5 trimethyl benzene 49.0/21.0/30.0 and Mixture-3: n-hexadecane/iso-octane/1,3,5 36.5/31.0/32.5 molar ratios), each having very different distillation properties. Simulations performed a transient one-dimensional sphero-symmetric model, involving reduced detailed chemical kinetics, gas-phase diffusive transport. The interactions among liquid-phase components modeled UNIFAC activity coefficient methodology. predictions Mixture-1 found be in good agreement with previously published drop-tower experiments for 550 µm air. Stagnant internally mixed both considered. Near internal conditions including sooting (observed experiments) result experimental drop diameter flame-standoff ratio histories. By comparing mixtures, vaporization exhibit strong non-linear dependences on initial ambient pressure. At low pressures sizes typical those multi-phase gas turbine combustors, comparable diffusion characteristic times favor frozen limit However, at applications, batch dominates property differences become as significant physical influencing behaviors.
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ژورنال
عنوان ژورنال: Proceedings of the Combustion Institute
سال: 2021
ISSN: ['1873-2704', '1540-7489']
DOI: https://doi.org/10.1016/j.proci.2020.06.200