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International Journal of Energy for a Clean Environment
SJR: 0.195 SNIP: 0.435 CiteScore™: 0.74

ISSN 印刷: 2150-3621
ISSN オンライン: 2150-363X

International Journal of Energy for a Clean Environment

Formerly Known as Clean Air: International Journal on Energy for a Clean Environment

DOI: 10.1615/InterJEnerCleanEnv.v5.i4.20
20 pages

EXPERIMENTAL INVESTIGATION OF OXYGEN-ENRICHED LIFTED AND ATTACHED TURBULENT DIFFUSION FLAMES

L. M. Howard
Energy and Resources Research Institute, University of Leeds, Leeds LS2 9JT, UK
P. M. Patterson
Energy and Resources Research Institute, University of Leeds, Leeds LS2 9JT, UK
Mohamed Pourkashanian
Department of Fuel and Energy, Energy and Resources Research Institute / Centre for Computational Fluid Dynamics, University of Leeds, Leeds LS2 9JT, UK
A. Williams
Department of Fuel and Energy, Energy and Resources Research Institute / Centre for Computational Fluid Dynamics, University of Leeds, Leeds LS2 9JT, UK
C. W. Wilson
Department of Mechanical Engineering, University of Sheffield, Sheffield S1 3JD, UK
L. Yap
FlameTec, North Fort Myers, Florida 33903, USA

要約

The interactions between turbulent fluid flow and chemical kinetics are examined experimentally in attached and lifted turbulent oxygen-enriched gaseous non-premixed flames by firing a methane jet vertically into a co-flowing oxidant shroud. Stable species, including nitrogen oxides, were measured using physical-probing techniques. Hydroxyl radical concentrations were monitored using laser-induced fluorescence (LIF). The level of oxygen enrichment in the shroud air was varied from 21% to 28% while maintaining constant average fuel-nozzle velocity and Reynolds number. Within the operating range, attached as well as lifted flames were observed. Physical and chemical differences in structure between attached and lifted flames are presented. With an increasing degree of oxygen, enrichment flames become shorter and more luminous in appearance. Attached flames appear more luminous with longer flame lengths. Significant amounts of oxygen were found on the fuel-rich side of the stoichiometric envelope in lifted flames, underscoring partially premixed characteristics near downstream locations.