OH-HCHO同時PLIF法による乱流予混合火炎の可視化と火炎構造(熱工学,内燃機関,動力など)

概要

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In this study, using simultaneous OH-HCHO PLIF (Planar Laser-Induced Fluorescence) technique, we have obtained instantaneous two-dimensional flame images to investigate highly turbulent premixed combustion in a cyclone-jet combustor. On the phase diagram, conditions of U_m<15m/s for φ_m=0.75 and U_m<20m/s for φ_m=0.90 belong to the flamelet regime, and those of U_m>20m/s for φ_m=0.75 and U_m=30m/s for φ_m=0.90 belong to thin reaction zones regime. In combustion field, HCHO plays an important role at relatively earlier stage of reaction and there is HCHO region mostly in preheat zone at the temperature range of 400K to 1400K. On the other hand, OH exists in reaction zone or burned gas. From simultaneous images of these two species, we have discussed the local flame structure, based on flame length and number of flame regions. When the exit velocity is increased, more cusps appear on the flame front, with larger flame length. Interestingly, it is observed that the flame front is disconnected in some images, corresponding to the local flame extinction.
一般社団法人日本機械学会の論文
2007-09-25