Interaction between Supersonic Jet and Burning Iron Wall in Oxygen Gas Cutting (Part II) : Combustion Stability and Flame Cutting Mechanism(Welding Physics, Process & Instrument)

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The paper describes the stability of combustion reaction in a two-dimensional model of oxygen gas cutting of iron which is obtained by the direct observation of flow pattern and burning wall configulation with high speed Schlieren photography. Combustion stability is closely related to the shock wave behaviours and necessary condition of stable burning is to satisfy a certain negative correlation between the shock wave angle and thickness of shock wave layer which is an appropriate index of the boundary layer thickness. If this relation is not held, two kinds of unstable reaction interruption which is the same phenomenon of lose-cut in actual flame cutting take place depending on the type of shock wave behaviour. A new boundary layer model of oxygen gas cutting is derived as a result of these investigations.
大阪大学の論文