高圧下における同軸噴流噴霧火炎構造とすす生成領域の実験的観察(熱工学,内燃機関,動力など)

概要

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Coaxial jet spray flames of kerosene and oxygen are studied experimentally in the ambient pressure range of 0.1-1.0MPa. The luminescence spectra of the flames are measured by spectroscopic measurement, and the flame temperature is measured by a two-color method. Soot production region and soot volume fraction are measured by laser-induced incandescence (LII). Spectroscopic measurement results show blue chemiluminescence in the combustion reaction region and soot emission in luminous flame is observed downstream of the combustion reaction region. CO_2 emission is also observed downstream of the luminous flame. The temperature measurement results show high-temperature regions near the burner. The flame temperature decreases drastically along the central axis and a minimum temperature point appears. This point moves upstream with increase in ambient pressure because vaporization of droplets occurs further upstream due to the change in droplet dispersion. LII measurements show that soot concentration increases till 0.5MPa and decreases above 0.7MPa. This trend agrees with the spectroscopic and temperature measurements, because the fuel vapor concentration distributions change with increase in ambient pressure due to the change in droplet dispersion and mixing between fuel vapor and oxidizer. These results show that the droplet behavior changes with increase in pressure and affects flame structure and soot production.
2010-08-25