拡散火炎におけるNO_Xの非定常生成特性の解明と組合せ予測手法の検証(熱工学,内燃機関,動力など)

概要

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In order to predict accurately the NO_x emission of turbulent diffusion flame, we proposed the combination method based on the laminar flamelet model. In this method, the detailed kinetics calculation is separated from the turbulent flow calculation, and then they are recombined in terms of recombination parameters to yield the NO_x emission of the whole flame. The recombination parameters have to be defined in common for both calculations. With the aim to find out the recombination parameters and to prove the validity of them, we carried out the numerical calculation for the unsteady combustion characteristics of counterflow diffusion flame, in which the spout velocities of counterflow varied in a cyclic. The obtained results are as follows : The production/consumption rates of major stable species are mostly determined by the scalar dissipation rate at flame surface SDR_q, and the production rates of intermediate products and nitric oxides are mostly detemnined by SDR_q and the maximum flame temperature T_<max>. Consequently, it is verified that SDR_q and T_<max> are appropriate as the recombination parameters of the combination method.
社団法人日本機械学会の論文
2003-02-25