高速画像撮影および局所火炎自発光の同時計測によるよどみ流中予混合噴霧火炎構造の検討 : 気相酸素濃度が火炎挙動および構造に及ぼす影響(熱工学,内燃機関,動力など)

概要

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We conducted an experimental observation of polydisperse premixed-spray flames of kerosene in a stagnation flow. For monitoring behaviors of fuel droplet and flame we adopted laser sheet visualization consisting of a high-speed digital CCD camera and Ar-ion laser, and OH-radical and CH-band emissions detected from local region in the vicinity of propagating flame by using a light-collecting probe. Three flames with different oxygen concentration in gaseous phase (21%, 19% and 17%) were examined. These flames had the same initial droplet size-distribution measured by Phase Doppler Anemometry at the burner exit, and all the other experimental conditions were kept same except oxygen concentration. In the case of oxygen concentration of 21%, various shape of spray boundary was formed depending on time, and combustion reaction zone overlapped considerably with spray area. On the other hand, in the case of 17%, the flame showed relatively flat-shaped spray boundary. Furthermore, we compared these flame behaviors and structures with those of premixed-spray flames we had observed before.
社団法人日本機械学会の論文
2003-08-25