C243 パーコレーション理論に基づく燃焼噴霧中の火炎伝播の解析(C-24 燃焼流(3),一般講演)

概要

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Spray combustion is widely used in practical combustor, but physical processes are very complex and have not been understood well. Our study is conducted to bridge the understandings from inter-droplet and spray combustion experiments applying percolation theory to spray combustion. In our model, a fuel spray element in standard air is represented with uniform cubic lattice model with randomly distributed n-decane droplets. Diffusion flame spreads taking in unburned droplets after a droplet is ignited. This process is expressed by Zeldovitch functions. From examining flame propagation feature with and without heating droplet effect, we found that probability on group combustion generation increases drastically at critical number density ratio n_c, which is equal with that without heating droplet effect. Above n_c, the probability is getting smaller by heat sink effect of unburned droplets differently from that without heating droplet effect. This indicates that n_c is necessary condition on group combustion generation.
2004-08-09