Shapes of nonbuoyant round luminous laminar-jet diffusion flames in coflowing air

Authors
Citation
Kc. Lin et Gm. Faeth, Shapes of nonbuoyant round luminous laminar-jet diffusion flames in coflowing air, AIAA J, 37(6), 1999, pp. 759-765
Citations number
38
Categorie Soggetti
Aereospace Engineering
Journal title
AIAA JOURNAL
ISSN journal
00011452 → ACNP
Volume
37
Issue
6
Year of publication
1999
Pages
759 - 765
Database
ISI
SICI code
0001-1452(199906)37:6<759:SONRLL>2.0.ZU;2-M
Abstract
The shapes (luminous flame boundaries) of steady nonbuoyant round luminous hydrocarbon-fueled laminar-jet diffusion flames burning in coflowing air we re studied both experimentally and theoretically, Flame shapes were measure d from photographs of flames burning at low pressures in order to minimize the effects of buoyancy, Test conditions involved acetylene-, propylene- an d 1,3-butadiene-fueled flames having initial reactant temperatures of 300 K , ambient pressures of 19-50 kPa, jet-exit Reynolds numbers of 18-121, and initial air/fuel velocity ratios of 0.22-32.45 to yield luminous flame leng ths of 21-108 mm, The present flames were close to the laminar smoke point but were not soot emitting. Simple expressions to estimate the shapes of no nbuoyant laminar-jet diffusion flames in coflow were found by extending an earlier analysis of Mahalingam et al, (Mahalingam, S,. Ferziger, J. H., and Cantwell, B. J., "Self-Similar Diffusion Flames," Combustion and Flame, Vo l. 82, No. 2, 1990, pp, 231-234), These formulas provided a good correlatio n of present measurements except near the burner exit where self-similar ap proximations used in the simplified analysis are no longer appropriate.