eprintid: 1303 rev_number: 5 eprint_status: archive userid: 956 dir: disk0/00/00/13/03 datestamp: 2009-01-14 lastmod: 2016-04-20 06:46:35 status_changed: 2009-09-23 16:48:33 type: article metadata_visibility: show creators_name: Higuera Antón, Francisco creators_name: Liñán Martínez, Amable creators_name: Iglesias Estradé, Inmaculada title: Effects of boundary layer displacement and separation on opposed-flow flame spread ispublished: pub subjects: fisica subjects: aeronautica abstract: An analysis is presented of the viscous-inviscid Interaction region around the tip of a flame spreading over the surface of a solid fuel in a forced laminar high reynolds number air stream that opposes the flame propagation. Through the interaction, the vaporization of the solid and the thermal expansion of the gas originate an adverse pressure gradient upstream of the flame tip, which leads to a decrease of the shear acting on the small region controlling the flame spread rate. Under certain realistic conditions this adverse pressure gradient may separate the boundary layer upstream of the vaporizing region of the solid, leading to a new mode of flame spread with a higher spread rate determined by the flow in the whole interaction region. date: 1997 date_type: published official_url: http://www.tandf.co.uk/journals/titles/13647830.asp full_text_status: public publication: Combustion Theory and Modelling volume: 1 number: 1 pagerange: 65-78 institution: Aeronauticos department: Motopropulsion refereed: TRUE issn: 1364-7830 referencetext: [1] Tarifa C S and Torralbo A M 1967 Flame propagation along the interface between a gas and a reacting medium Proc. 11th Int. Symp. on Combustion pp 533-44 [2] deRis J N 1969 Spread of a laminar diffusion flame Proc. 12th Int. Symp. on Combustion pp 241-52 [3] Williams F A 1976 Mechanisms of flame spread Proc. 16th Int. Symp. on Combustion pp 1281-94 [4] Fernandez-Pello A C and Hirano S T 1983 Controlling mechanisms of flame spread Combust. Sci. Technol. 32 1-31 [5] Fernandez-Pello A C 1992 Flame spread modeling Combust. Sci. Technol. 39 119-34 [6] Wichman I S 1992 Theory of opposed-flow flame spread Prog. Energy Combust. Sci. 18 553-93 [7] Tarifa C S, Lilian A, Salva J J, Juste G L, Tiz6n J M and Cura J M 1990 Study on Combustion Processes in Reduced Gravity Final report LPTR 9004 for ESA Contract 8272/89/F/BZ(SC) [8] Altenkirch R A, Eichhorn R and Shang P C 1980 Buoyancy effects on flames spreading down thermally thin fuels Combust. Flame 37 71-83 [9] Fernandez-Pello A C, Ray R S and Glassman I 1981 Flame spread in an opposed flow: the effect of ambient oxygen concentration Proc. 18th Int. Symp. on Combustion pp 579-87 [10] Hirano T and Kanno Y 1973 Aerodynamics and thermal structures of the laminar boundary layer over a flat plate with a diffusion flame Proc. 14th Int. Symp. on Combustion pp 391-8 [11] Mao C P, Kodama H and Fernandez-Pello A C 1984 Convective structure of a diffusion flame over a flat combustible surface Combust. Flame 57 209-36 [12] Hirano T, Noreikis S and Waterman T 1974 Measured velocity and temperature profiles near flames spreading over a thin combustible solid Combust. Flame 23 83-96 [13] Fernandez-Pello A C and Williams F A 1976 Experimental techniques in the study of laminar flame spread over solid combustibles Combust. Sci. Technol. 14 155-67 [14] Smith F T 1982 On the high Reynolds number theory of laminar flows IMA J. Appl. Math. 28 207-81 [15] Goldstein S 1930 Concerning some solutions of the boundary layer equations in hydrodynamics Proc. Camb. Phil. Soc. 26 1-30 [16] Hakkinen R J and Rott N 1965 Similarity solutions for merging shear flows II AIAA J. 3 1553-4 [17] Fernandez-Pello A C and Williams FA 1977 A theory of flame spread over flat surfaces of solid combustibles Combust. Flame 28 251-277 [18] Higuera F J 1997 Boundary layer separation due to gas thermal expansion Phys. Fluids submitted [19] Carslaw H S and Jaeger J C 1959 Conduction of Heat in Solids 2nd edn (Oxford: Oxford University Press) [20] Smith F T 1983 Interacting flow theory and trailing edge separation-no stall J. Fluid Mech. 131 219 rights: by-nc-nd citation: Higuera Antón, Francisco and Liñán Martínez, Amable and Iglesias Estradé, Inmaculada (1997). Effects of boundary layer displacement and separation on opposed-flow flame spread. "Combustion Theory and Modelling", v. 1 (n. 1); pp. 65-78. ISSN 1364-7830. document_url: https://oa.upm.es/1303/1/LINAN_1997_04.pdf