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ABSTRACT
This paper addresses the numerical description of lifted flames in axisymmetric laminar coflow jets. The analysis considers moderately large values of the Reynolds number, when the boundary-layer approximation can be used to describe the slender mixing region that extends between the jet exit and the flame, providing the profiles of velocity and mixture fraction that exist immediately upstream from the flame front region. The description of the nonslender flame front region, which provides the front propagation velocity as an eigenvalue, requires integration of the Navier-Stokes Equations with account taken of the reaction and thermal expansion effects. The limiting formulations corresponding to cases of practical interest, including large values of the air-to-fuel stoichiometric ratio, are briefly discussed. Illustrative numerical results are given for flames lifted or propagating at distances small compared with the jet development length, where the mixing layer is nearly planar.
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Acknowledgments
It is a very pleasant task to acknowledge here our debt to Forman Arthur Williams for his contributions to combustion science, for his invaluable role in educating us, and for the pleasure of his friendship. The senior author wants to use the opportunity of this paper to acknowledge that his work on the large activation energy asymptotics, which was initiated around 1968, would not have been carried out without the encouragement and collaboration of Forman Williams. In particular, the 1974 paper of A.L. on counterflow diffusion flames was written in July 1973 in La Jolla, with the continuous advice of Forman, who by writing the abstract at the begining of the stay of A.L., pressured him to write the paper and provided its general structure.