18th AIAA/3AF International Space Planes and Hypersonic Systems and Technologies Conference 2012
SEP 24-28, 2012
In this paper, unsteady process of ignition of partially cracked kerosene in a Mach 2.5 supersonic model combustor was studied numerically. The reaction flow was solved with SST k-ω turbulence model and a kinetic mechanism of kerosene reduced from a detailed mechanism. Eddy dissipation concept is used to model the turbulence/chemistry interaction and In Situ adaptive tabulation algorithm applied for the acceleration of numerical integrations. Based on the present results, time evolutions of ignitions of partially cracked kerosene are described and the temporal and spatial changes of main radicals and products are provided. It is found that the pilot hydrogen supplies a radical pool of OH in the cavity that promotes the ignition of kerosene and stabilizes the flame. For the present flow and fuel conditions, ignition of partially cracked kerosene is completed at a physical time of approximately 5.6ms. However, for uncracked gaseous kerosene, the finish time of ignition is significantly longer. It is believed that the HCO radical formed by the oxidation of C2H4, one of the major products of kerosene cracking, attributes to the ignition acceleration for partially cracked kerosene.
American Institute for Aeronautics and Astronautics (AIAA)
Zhong FQ,Chen LH,Chang XY,et al. Numerical study of ignition and combustion of partially cracked kerosene in a mach 2.5 supersonic model combustor[C]18th AIAA/3AF International Space Planes and Hypersonic Systems and Technologies Conference 2012,2012.