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Physical and Chemical Processes in Flames
Technical Report,11 Jan 2006,30 Oct 2009
Department of Mechanical and Aerospace Engineering Princeton Univ. Princeton United States
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The scope of the present program covers the structure and response of laminar and turbulent premixed and diffusion flames, with emphases on effects of high pressure, flameflow unsteadiness, and chemistry. Studies on combustion chemistry included Iexperimental determination of stretch-affected ignition and extinction limits of premixed and nonpremixed flames and the laminar flame speeds for various fuel -oxidizers including COIH2, ethylene, I ,3-butadiene, n-heptane, and methyl decanoate 2 further advances on the method of directed relation graph for mechanism reduction, and auxiliary methodologies for facilitated computation including analytic solution of the quasi-steady species, the lumping of diffusion coefficients, and the development of a fitting formula for the falloff curves of unimolecular reactions and 3 soot formation in flames through mapping of the toluene flame structure and direct numerical simulations of the turbulent premixed and diffusion flame structure. Studies on flame dynamics show strong coupling between intrinsic flame front pulsating instability, radiation heat loss, flame stretch, and the extinction limits for diffusion flames, with and without forcing. These accomplishments are expected to be useful to the general interests of AFOSR in the fundamental and practical issues of flame dynamics, chemical kinetics, turbulent combustion, soot formation, radiative hear transfer, flame extinction, and stabilization.
APPROVED FOR PUBLIC RELEASE