小円孔における予混合火炎の消炎に関する研究 : 消炎円孔径の測定と消炎時の火炎の挙動の観察(熱工学,内燃機関,動力など)

概要

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The quenching diameters of propane/air and methane/air flames were measured for propagation through a short circular hole, and the flame behavior was photographed using a highspeed digital video camera. As the flame quenching showed stochastic, two critical diameters were defined ; the critical quenching diameter, below which flames are always quenched, and the critical propagation diameter, above which flames always propagate through the holes. The equivalence ratio at which minimum quenching diameter of propane/air flame was obtained was much richer than the data obtained in the previous studies. This is considered to be the effects of Lewis number of unburned mixture and preferential diffusion of those species. The flame surfaces are convex toward the inlet of the hole. The flames showed complicated behavior due to buoyancy at the entrance of the hole. A flame let could be observed just above the inlet after the flame extinction on the surface of the glass. Almost all quenched flames extinguished above the inlet of the hole.
一般社団法人日本機械学会の論文
2003-03-25