Montgomery, CJ
1990
Temperature and Concentration Measurements in a Turbulent Spray Flame
Montgomery, C.J.; Son, S.F. and Queiroz, M.
Heat Transfer in Combustion Systems, 142, 1990. Funded by ACERC.
Measurements of average gas-phase temperature and concentration of major stable gaseous species, as well as rms, power spectral densities, probability density functions, autocorrelations and other statistical data for temperature are presented for a simplified turbulent spray flame. The flame consists of an array of six vertical streams of nearly-monosized hexane droplets anchored at one edge by a small hydrogen pilot flame. Composition profiles were obtained by microprobe sampling and gas chromatography. Temperatures were measured by a fine wire thermocouple and compensated for thermal inertia using a digital deconvolution technique. The above measurements are presented for initial fuel temperatures of 28ºC and 45ºC. The measurements show that very rapid chemical reaction and heat release take place in the flame's blue partially premixed zone. In the yellow diffusion-flame zone following the blue region, temperatures and species concentrations change more slowly because fuel droplets exist well upstream into the flame and continue supplying fuel vapor that reacts quickly with oxygen entering the flame zone through turbulent mixing. These results demonstrate that the flame studied here is quite different from a gaseous flame because of the significant effect of the liquid phase on the combustion process. Since this may also be the case in many practical systems, it is important that reliable experimental data on spray combustion be obtained, both to aid the development of numerical models and to enhance our understanding of the phenomena involved.
1989
Scalar Measurements in a Simplified Spray Flame
Montgomery, C.J.; Son, S.F. and Queiroz, M.
Western States Section, The Combustion Institute, Pullman, Washington, 1989. Funded by ACERC (National Science Foundation and Associates and Affiliates).
Measurements of average gas-phase temperature and concentration of major stable gaseous species, as well as rms, power spectral densities, probability density functions, autocorrelations and other statistical data for temperature are presented for a simplified turbulent spray flame. The flame consists of an array of six vertical streams of nearly-monosized hexane droplets anchored at one edge by a small hydrogen pilot flame. Composition profiles were obtained by microprobe sampling and gas chromatography. Temperatures were measured by a fine wire thermocouple and compensated for thermal inertia using a digital deconvolution technique. The above measurements are presented for initial fuel temperatures of 28ºC and 45ºC. The measurements show that very rapid chemical reaction and heat release take place in the flame's blue partially premixed zone. In the yellow diffusion-flame zone following the blue region, temperatures and species concentrations change more slowly because fuel droplets exist well upstream into the flame and continue supplying fuel vapor that reacts quickly with oxygen entering the flame zone through turbulent mixing. These results demonstrate that the flame studied here is quite different from a gaseous flame because of the significant effect of the liquid phase on the combustion process. Since this may also be the case in many practical systems, it is important that reliable experimental data on spray combustion be obtained, both to aid the development of numerical models and to enhance our understanding of the phenomena involved.
Montgomery, CJ
1990
Temperature and Concentration Measurements in a Turbulent Spray Flame
Montgomery, C.J.; Son, S.F. and Queiroz, M.
Heat Transfer in Combustion Systems, 142, 1990. Funded by ACERC.
Measurements of average gas-phase temperature and concentration of major stable gaseous species, as well as rms, power spectral densities, probability density functions, autocorrelations and other statistical data for temperature are presented for a simplified turbulent spray flame. The flame consists of an array of six vertical streams of nearly-monosized hexane droplets anchored at one edge by a small hydrogen pilot flame. Composition profiles were obtained by microprobe sampling and gas chromatography. Temperatures were measured by a fine wire thermocouple and compensated for thermal inertia using a digital deconvolution technique. The above measurements are presented for initial fuel temperatures of 28ºC and 45ºC. The measurements show that very rapid chemical reaction and heat release take place in the flame's blue partially premixed zone. In the yellow diffusion-flame zone following the blue region, temperatures and species concentrations change more slowly because fuel droplets exist well upstream into the flame and continue supplying fuel vapor that reacts quickly with oxygen entering the flame zone through turbulent mixing. These results demonstrate that the flame studied here is quite different from a gaseous flame because of the significant effect of the liquid phase on the combustion process. Since this may also be the case in many practical systems, it is important that reliable experimental data on spray combustion be obtained, both to aid the development of numerical models and to enhance our understanding of the phenomena involved.
1989
Scalar Measurements in a Simplified Spray Flame
Montgomery, C.J.; Son, S.F. and Queiroz, M.
Western States Section, The Combustion Institute, Pullman, Washington, 1989. Funded by ACERC (National Science Foundation and Associates and Affiliates).
Measurements of average gas-phase temperature and concentration of major stable gaseous species, as well as rms, power spectral densities, probability density functions, autocorrelations and other statistical data for temperature are presented for a simplified turbulent spray flame. The flame consists of an array of six vertical streams of nearly-monosized hexane droplets anchored at one edge by a small hydrogen pilot flame. Composition profiles were obtained by microprobe sampling and gas chromatography. Temperatures were measured by a fine wire thermocouple and compensated for thermal inertia using a digital deconvolution technique. The above measurements are presented for initial fuel temperatures of 28ºC and 45ºC. The measurements show that very rapid chemical reaction and heat release take place in the flame's blue partially premixed zone. In the yellow diffusion-flame zone following the blue region, temperatures and species concentrations change more slowly because fuel droplets exist well upstream into the flame and continue supplying fuel vapor that reacts quickly with oxygen entering the flame zone through turbulent mixing. These results demonstrate that the flame studied here is quite different from a gaseous flame because of the significant effect of the liquid phase on the combustion process. Since this may also be the case in many practical systems, it is important that reliable experimental data on spray combustion be obtained, both to aid the development of numerical models and to enhance our understanding of the phenomena involved.