Accepted manuscript
Preferential vaporization impacts on lean blow-out of liquid fueled combustors
Combustion and flame, Vol.205, pp.295-304
07/2019
Handle:
https://hdl.handle.net/2376/123343
Appears in Aviation Sustainability Center (ASCENT)
Abstract
Recent experimental works have shown that the global equivalence ratio defining lean blow-out (LBO) in model gas turbine combustors correlates with the derived cetane number (DCN) of the tested fuel, which represents the chemical reactivity potential of the fuel, but additional physical and kinetic parameters of the fuel also have influence. The current work explores the significance of preferential vaporization impacts on LBO behaviors; i.e., rather than parameterizing the fuel by overall averaged fuel properties, it looks at DCN correlations based upon distillation properties prior to full vaporization. Preferential vaporization potentials of six fuels are evaluated by measuring the DCN values of five distillation cuts (each of 20% liquid distillation volume recovered). In spite of relatively large disparities in total fuel DCN values (∼9.1), two petroleum-derived jet fuels are found to have nearly the same LBO equivalence ratios, which is attributed to the relatively indiscernible difference of DCN values (∼2) for the initial 20% distillation cut of each fuel. Trade-off impacts between fuel chemical and physical properties are demonstrated by comparing n-dodecane and Gevo-ATJ, which do not have preferential vaporization potential. LBO results suggest that fuel physical properties (particularly fuel boiling characteristics) predominantly control LBO behaviors at low air inlet temperature conditions, whereas fuel chemical properties appear to gain significance with increasing air inlet temperature. Further evidence of preferential vaporization effects on LBO is discussed with two surrogate mixtures formulated to emulate the fully pre-vaporized combustion behaviors of Jet-A, but having drastically different preferential vaporization potentials. Finally, the relationship between DCNs and LBO equivalence ratios is re-examined using the DCN values of initial 20% distillation cuts of all six fuels. The results display a significantly improved correlation, suggesting that the relevance of preferential vaporization on LBO can be significant for fuels that exhibit significant departure of the DCN for high volatile fractions (i.e., the initially vaporized constituents) in comparison to the overall fuel DCN.
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Details
- Title
- Preferential vaporization impacts on lean blow-out of liquid fueled combustors
- Creators
- Sang Hee Won - University of South CarolinaNicholas Rock - Ben T. Zinn Combustion Laboratory, Georgia Institute of Technology, Atlanta, GA 30318, USASeung Jae Lim - University of South CarolinaStuart Nates - University of South CarolinaDalton Carpenter - University of South CarolinaBenjamin Emerson - Ben T. Zinn Combustion Laboratory, Georgia Institute of Technology, Atlanta, GA 30318, USATim Lieuwen - Ben T. Zinn Combustion Laboratory, Georgia Institute of Technology, Atlanta, GA 30318, USATim Edwards - Air Force Research LaboratoryFrederick L Dryer - University of South Carolina
- Publication Details
- Combustion and flame, Vol.205, pp.295-304
- Academic Unit
- Aviation Sustainability Center (ASCENT); Alternative Jet Fuel
- Publisher
- Elsevier Inc
- Grants
- 13-C-AJFE-GIT-008, Federal Aviation Administration (United States, Washington) - FAA
- Identifiers
- 99900620471701842
- Language
- English
- Resource Type
- Accepted manuscript