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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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Keywords: jet flames; lift-off; triple flames

Document Type: Research Article

Affiliations: 1: E.T.S.I. Aeronáuticos, Madrid, Spain 2: I.N.T.A., Madrid, Spain 3: Area de Mecánica de Fluidos, Universidad Carlos III de Madrid, Leganés, Spain

Publication date: May 1, 2005

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