火炎構造診断のための化学発光計測 : 層流予混合火炎における基礎特性と乱流予混合火炎への適用性(熱工学,内燃機関,動力など)

概要

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The potential of using spatially-and temporally-resolved chemiluminescence measurements to explore the local flame structure of turbulent premixed flames was investigated. This study examined relations between local behaviors of reaction zone and OH^*, CH^*, and C^*_2 chemilumisescence intensities. Chemiluminescence intensity ratio of OH^*/CH^*, C^*_2/CH^*, and C^*_2/OH^* had encouraging linear correlations with equivalence ratio (φ=0.9〜1.4) and temperature (1 860〜2 160 K) in atmospheric laminar CH_4/air and C_3H_8/air premixed flames. Notice that these ratios have little dependence on movement and curvatures of unstretched flame fronts, which should be occured in actual turbulent premixed flames. Thus, the chemiluminescence intensity ratio can be a good indicator for changing of the local flame structure in turbulent premixed flame fronts. Time evolution of OH^*, CH^*, and C^*_2 chemiluminescence intensities measured simultaneously with ion currents in turbulent C_3H_8/air premixed flames showed capabilities of this optical technique to illustrate the structure of local flame fronts. Furthermore, flamelet passing frequency measured by chemiluminescences agreed well with that by ion currents.
一般社団法人日本機械学会の論文
2003-02-25