The instability characteristics of lean premixed hydrogen and syngas flames stabilized on meso-scale bluff-body
KAUST DepartmentClean Combustion Research Center
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AbstractBluff-body flame stabilization has been used as one of main flame stabilization schemes to improve combustion stability in both large and small scale premixed combustion systems. The detailed investigation of instability characteristics is needed to understand flame stability mechanism. Direct numerical simulations are conducted to investigate flame dynamics on the instability of lean premixed hydrogen/air and syngas/air flames stabilized on a meso-scale bluff-body. A two-dimensional channel of 10 mm height and 10 mm length with a square bluff-body stabilizer of 0.5 mm is considered. The height of domain is chosen as an unconfined condition to minimize the effect of the blockage ratio. Flame/flow dynamics are observed by increasing the mean inflow velocity from a steady stable to unsteady asymmetrical instability, followed by blowoff. Detailed observations between hydrogen and syngas flames with a time scale analysis are presented.
CitationKim YJ, Lee BJ, Im HG (2017) The instability characteristics of lean premixed hydrogen and syngas flames stabilized on meso-scale bluff-body. 55th AIAA Aerospace Sciences Meeting. Available: http://dx.doi.org/10.2514/6.2017-1103.
SponsorsThis work has been sponsored by King Abdullah University of Science and Technology (KAUST). The simulations utilized computing resources at KAUST Supercomputing Laboratory and Research Computing.
Conference/Event name55th AIAA Aerospace Sciences Meeting