Kinetic analysis of n-decane-hydrogen blend combustion in premixed and non-premixed supersonic flows

• Published in: Combustion theory and modelling 2016-01, Vol.20 (1), p.99-130
• Main Authors: Starik, Alexander M., Bezgin, Leonid V., Kopchenov, Valery I., Titova, Nataliya S., Torokhov, Sergey A.
• Format: Article
• Language: English
• Subjects: Chain reactions; Chains; Combustion; detailed and reduced reaction mechanisms; Ducts; Fuels; kinetics of ignition and combustion; Mathematical models; n-decane-hydrogen blend; numerical simulation; Reaction kinetics; scramjet duct; Supersonic flow
• ISSN: 1364-7830; 1741-3559
• DOI: 10.1080/13647830.2015.1118554

Numerical analysis of ignition and combustion of an n-decane-hydrogen fuel blend in a premixed supersonic flow and in a model scramjet duct is performed using a reduced reaction mechanism built especially to describe the oxidation of blended n-C 10 H 22 -H 2 fuel in air at the temperature T 0 > 900-1000 K in the pressure range P 0 = 0.1-13 atm. The developed kinetic mechanism involves the principal reactions responsible for chain mechanism development both for n-decane and for hydrogen oxidation. It has been shown that using blended n-C 10 H 22 -H 2 fuel makes it possible to enhance the ignition and combustion both in premixed and in non-premixed supersonic fuel-air flows compared to burning pure hydrogen-air and n-decane-air mixtures. This allows high combustion completeness in the scramjet duct at the distance of ∼1 m even at extremely low air temperature T 0 = 1000 K and pressure P 0 = 0.3 atm. This is due to the interaction of kinetics of the formation of highly reactive atoms and radicals, carriers of chain mechanism, in H 2 -air and n-C 10 H 22 -air mixtures.