濃淡燃焼火炎の火炎基部における保炎特性 : 層流濃淡燃焼火炎の非定常数値解析による考察(熱工学,内燃機関,動力など)

概要

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Recently much attention has been paid on lean-rich combustion as one of the methods to reduce NO_x emission level. In this investigation NO_x emission characteristics of the lean-rich combustion were numerically analyzed by taking a set of elementary reactions into consideration. It was found that decreasing the equivalence ratio of the rich flame effectively reduces the NO_x level, while it makes the rich flame slightly unstable. In this paper, therefore, unsteady structure and stability characteristics of the attached flames after ignition are examined by using the numerical analysis with a set of elementary reactions installed. According to the results, the combined effects of convection and diffusion of fuel, active species and heat from the rich-side flame to the lean-side flame in the attached regions near the rim are found to control the structure and stability of the leanrich combustion. It is considered that the vortex region formed behind the rim performs an important part in the flame stabilization of the lean-rich combustion.
一般社団法人日本機械学会の論文
2002-10-25