AM06-23-009 水素・空気乱流予混合気の着火及び火炎伝播のDNS(燃焼・反応流(2),一般講演)

概要

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Direct numerical simulations of ignition and propagating of hydrogen-air premixed flame in two-dimensional homogeneous isotropic turbulence are conducted to investigate the effects of turbulence and equivalent rate on ignition and propagation process. In the ignition process, eddies stretch the high temperature region and disturb its evolution. The influence of equivalent rate is weak in production of intermediates which are needed for ignition. In the propagation process, strong eddies prevent propagating of the flame, and the flame propagates at edges of the eddies. For stoicheiometric condition, the strong eddies near the flame kernel transport the flame into the bumed gas and the transported flame shows high heat release rate. However, for lean conditions, the heat release rate is independent of the flame geometry and shows relatively high value.
2006-09-05