化学発光分光法による乱流火炎構造の計測に関する基礎的研究(熱工学,内燃機関,動力など)

概要

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To examine temperature of the local reaction zone of turbulent premixed flames, dependence of the emission by OH, CH and C_2 radicals obtained from hydrocarbon-air premixed flames on flame temperature has been examined. To detect weak emissions of C_2 radical, both spectrometer and amplifies were newly developed to achieve the signal-noise ratio of the newly developed system is two-digit higher than that of the conventional system. Measurements were made at various equivalence ratios in laminar premixed methane/air and propane/air flames, which have different flame temperatures. The chemiluminescence intensity ratio of 515nm/470nm bans of C_2, C_2^*(0,0)/C_2^*(1,0), in both methane/air and propane/air flames has a high correlation with flame temperature. The chemiluminescence intensity ratio of C_2^*(0,0)/C_2^*(1,0) has two branches for the flame temperature. i.e., as it increases, flame temperature increases, has maximum near the stoichiometry and decreases. The error in C_2^*(0,0)/C_2^*(1,0) measurement was within 3% for propane flames, within 6% for methane flames. It has been shown in the present study that temperature of the local reaction zone of premixed flames can be estimated by measuring the chemiluminescence intensity ratio of C_2^*(0,0)/C_2^*(1,0).
2010-09-25