332 音響により励起されたコヒーレント渦構造をもつ平面せん断流における火花点火予混合火災の伝播方向に関する研究(大気環境保全技術(III))(大気・水保全技術)

概要

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In order to elucidate the enhancement mechanisms of turbulent flame propagation, it is indispensable to examine and clarify the detailed process of vortex-flame interaction.In this investigation a series of large scale organized eddies formed in the plane propane-air premixed shear flow are selected as an objective eddy field. Two devised techniques are introduced and combined with each other ; one is the acoustic excitation of the shear flow, the other is the simultaneous two-directional high-speed schlieren photography. The former makes the organized eddy formation extremely regular and enables synchronized ignition with a high-speed video camera. The latter gives the chance to analyze two different directional views of a same propagating flame. In this paper it is shown that the propagation velocity along the axis of the eddy is promoted by the vortex bursting and is greater than that in the radial direction by about 80 %.
社団法人日本機械学会の論文
2001-07-09