CO/H_2 噴流拡散火炎における局所反応速度および拡散速度(熱工学,内燃機関,動力など)

概要

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The local reaction rate and the diffusion rate in a turbulent diffusion combustion field are important parameters which dominate combustion phenomena in a turbulent diffusion flame. However, they can not be directly measured. Then, the present authors developed the method to obtain the local reaction rate and the diffusion rate by numerical calculation using measured values. In the present study, this method was applied to a CO/H_2 jet diffusion flame in order to examine the influence of preferential diffusion of H_2 on a jet dilusion flame. The following results were obtained. (1) In a high-temperature region, the effective diffusion coefficient D_H, which is obtained using H element as tracers, was larger than the effective diffusion coefficient Dc which obtained using C element as tracers. This result indicates that the molecular diffusion rate of H_2 increases in a high-temperature, and that it can not be disregarded in comparison with the turbulent diffusion rate. (2) The large difference in the reaction rate distribution was produced by the difference of the molecular diffusion rate between H_2 and CO. The local reaction rate of H_2 was more than 2 times in comparison with that of CO. The peak position of the reaction rate of H_2 was remarkably more located in the fuel side than that of CO.
社団法人日本機械学会の論文
2002-03-25