密度変化を考慮したモデルによる部分予混合雰囲気中の火炎の燃え拡がり解析(熱工学,内燃機関,動力など)

概要

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In this study, we have numerically investigated flame spread over solid fuel in partially premixed atmospheres, which may occur under poorly ventilated conditions, forming the combustible mixtures of oxygen and fuel vapors. The compressible model is adopted. For simplicity, the pyrolysis region is moved based on the heat transfer to the unburned solid surface. That is, the flame spread is determined by the motion of fuel injection area on the solid surface. To confirm the validity of our numerical model, experimentally measured temperature profiles of thin filter paper sheets are compared. To consider partially premixed atmospheres, methane is added in the ambient air by keeping the fuel concentration under lean flammable limit. For discussing the flame structure, the flame index is obtained to observe premixed and non-premixed flames. Results show that, the good agreement is obtained between simulated and measured temperature profiles. In partially premixed atmospheres, the flame spread rate is increased, with the expanded high temperature region. This is because the premixed region exists along the original diffusion flame, resulting in the increase of flame temperature to support the larger flame spread rate.
2007-12-25