1207 噴流拡散火炎の保持機構に関する研究(GS-6 燃焼(乱流・拡散・火炎))

概要

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The flame stability limits essentially define the fundamental operation of the combustion system. For various species of fuels (methane hydrogen, and propane), the flame-base stability mechanism for flame holding has been studied. In this study, the transition behavior from the stable flame attached to nozzle rim to lifting and blowoff is observed experimentally in a quiescent atmosphere. Experiments were conducted to investigate the flame structure at the upstream end of the diffusion flames adjacent to the nozzle rim which dominates the flame holding and lifting mechanism and to make clear the flame lifting and the mechanistic causes in diffusion flames. The results obtained are as follows. (1) There exists a narrow dark region between the nozzle rim and the upstream end of the diffusion flame. The upstream end of the diffusion flame is located at the side of air near the nozzle rim in a quiescent atmosphere. So the stability limit of the flame is influenced by the fuel jet velocity. (2) The lifting velocity is higher, when the upstream end of the diffusion flame is located on the thick rim. (3) When the nozzle diameter is very smaller, lifting and blowoff happen at the same time.
社団法人日本機械学会の論文
2001-03-16