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- W2001922275 abstract "An approximate theoretical analysis is used to consider the configuration of a laminar axisymmetric flame in a combustible gaseous mixture, subject to large-activation-energy kinetics and flowing at a velocity in excess of the normal flame velocity (i.e., flowing supercritically). Attention is centered on nonintrmive energy addition from a line or point source by use of a laser. For a continuous-ignition point source, the flame appears as a semi-finite bluff body, with its nose directed upwind. Away from the axis of symmetry, the flame approaches the conical shape that is observed when an adiabatic flame is stabilized in supercritical flows by different types of localized intrusive flameholders. In general, the temperature varies along the flame locus; the temperature is a maximum at the point of the locus that is on the axis of symmetry, and the temperature approaches the adiabatic flame temperature at large lateral distance from the axis. The corresponding, planarsymmetric flame locus that arises from a line source in a supercritically flowing mixture is also analyzed. The solutions presented here are based on very simplified dynamics and hold only for negligible chemical exothermicity and negligible energy addition by the ignition source; they are intended only as starting points for needed further investigations. In concluding remarks, qualitative expectations for a long train of intermittent or periodic, but rapidly repeated, pulses are discussed briefly. For flame stabilization, such an energy source need only to initiate a train of downwind-conv ected flame kernels, which will result in a self-sustaining flame. Clearly, the continuous source is highly energy demanding relative to the intermittent source, which therefore seems of greater practical interest; the continuous source, however, would be of laboratory interest." @default.
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- W2001922275 date "1992-03-01" @default.
- W2001922275 modified "2023-09-25" @default.
- W2001922275 title "Flame configuration associated with localized energy addition to a flowing combustible mixture" @default.
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- W2001922275 doi "https://doi.org/10.2514/3.23500" @default.
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