Interaction between Supersonic Jet and Burning Iron Wall in Oxygen Gas Cutting (Part I) : Shock Wave Behaviour and Combustion Phenomena(Welding Physics, Process & Instrument)

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The paper describes an observation method of interaction phenomena between a supersonic jet and cutting front wall in oxygen gas cutting by a two dimensional experimental model in which a self sustaining combustion takes place at the end of continuously fed iron strip, and the obtained results of jet flow pattern and burning wall behaviours by Schlieren methods with high temporal resolution. It has been observed that a distinct oblique shock wave is generated when the combustion rate is increased and its behaviours are affected by the burning rate and position of jet impingement at the top edge of burning wall. There are three basic types of shock behaviours, i.e., one stationary mode and two periodic modes, and their appearing conditions and cross correlations with the burning wall parameters have been clarified. It has been also revealed that the two types of periodic motions of shock wave are closely related to the so called lose-cut phenomenon in flame cutting that is featured by a sudden interruption of combustion reaction in higher cutting speed.
大阪大学の論文