Investigation of a turbulent premixed combustion flame in a backward-facing step combustor; effect of equivalence ratio
作者： Medhat A. Nemitallah , Gaurav Kewlani , Seunghyuck Hong , Santosh J. Shanbhogue , Mohamed A. Habib
DOI: 10.1016/J.ENERGY.2015.12.010
关键词: Mechanics 、 Combustion 、 Lift (force) 、 Laminar flame speed 、 Particle image velocimetry 、 Chemistry 、 Premixed flame 、 Turbulence 、 Combustor 、 Analytical chemistry 、 Large eddy simulation
摘要: Abstract In the present study, LES (large-eddy simulation) is utilized to analyze lean-premixed propane-air flame stability in a backward-step combustor over range of equivalence ratio. The artificially thickened approach coupled with reduced reaction mechanism incorporated for modeling turbulence–combustion interactions at small scales. Simulation results are compared high-speed PIV (particle image velocimetry) measurements validation. show that numerical framework captures different topological flow features effectively and reasonable accuracy, stable configurations, but some quantitative differences exist. RZ (recirculation zone) formed primary eddy secondary its overall size significantly impacted by temperature distribution inside recirculation zone highly non-uniform, much lower values observed close backward step bottom wall. mixture also non-uniform because mixing reactants heat loss walls. stabilized closer as ratio increases. At fuel fractions, lifts off starting 0.63 lift distance increased while lowered.
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