Abstract
Coaxial jet spray flames of kerosene and oxygen are studied experimentally in the pressure range 0.1-1.0 MPa. The flame temperature is measured by a two color method. The soot production region and soot volume fraction are measured by laser induced incandescence (LII). The results of the temperature measurements 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 an increase in ambient pressure, because fuel spray penetration reduces and vaporization of droplets occurs further upstream. The LII measurements show that soot concentration decreases around the central axis up to 0.5 MPa and increases above 0.7 MPa. This is because the fuel vapor concentration distributions change with an increase in ambient pressure due to the change in droplet dispersion. These results show that the behavior of droplets changes as pressure increases and affects flame structure and soot production.
