Numerical Studies of Reacting Flow over Flat Walls with Fuel Injection : Part2:Triple-Structure / Stabilization of a Diffusion Flame

概要

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A numerical study is performed on a two-dimensional, chemically reacting boundary layer to achieve a physical understanding of the stabilization and triple structure of a bulk flame. A theoretical model is presented to couple fluid dynamics, chemical kinetics and heat transfer at the surface of a flat wall. Computations are carried out at different Nusselt numbers and Reynolds numbers based on the free stream velocity. When the Nusselt number is increased, the flame apex begins to leave the wall surface and this manifests an unstable process. Finally it is blown off when the Nusselt number becomes sufficiently large. For a stable flame, three zones can be identified near the flame apex:a nonreactive mixing zone, a premixed / partially premixed flame zone and a diffusion flame zone. When the Reynolds number is decreased, the reaction zone develops away from the wall and more heat and fuel mass are transferred upstream of the burner, which is conducible to the stabilization of a bulk flame
一般社団法人日本機械学会の論文
1999-02-15