Effects of turbulence and carrier fluid on simple, turbulent spray jet flames

This paper presents simultaneous LIF images of OH and the two-phase acetone fuel concentration as well as detailed single-point phase-Doppler measurements of velocity and droplet flux in three turbulent spray flames of acetone. This work forms part of a larger program to study spray jets and flames...

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Bibliographic Details
Published in:Combustion and flame 2005-12, Vol.143 (4), p.420-432
Main Authors: Stårner, Sten H., Gounder, James, Masri, Assaad R.
Format: Article
Language:English
Subjects:
ACETONE
Applied sciences
Combustion. Flame
DROPLETS
Energy
Energy. Thermal use of fuels
EVAPORATION
Exact sciences and technology
FLAMES
HYDROXYL RADICALS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LIF imaging
MOTION
PARTICLE SIZE
Phase-Doppler anemometry
Spray flames
Theoretical studies. Data and constants. Metering
TURBULENCE
Turbulent flames
VELOCITY
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Summary:This paper presents simultaneous LIF images of OH and the two-phase acetone fuel concentration as well as detailed single-point phase-Doppler measurements of velocity and droplet flux in three turbulent spray flames of acetone. This work forms part of a larger program to study spray jets and flames in a simple, well-defined geometry, aimed at providing a platform for developing and validating predictive tools for such flows. Spray flames that use nitrogen or air as droplet carrier are investigated and issues of flow field, droplet dispersion, size distribution, and evaporation are addressed. The joint OH/acetone concentration images reveal a substantial similarity to premixed flame behavior when the carrier stream is air. When the carrier is nitrogen, the reaction zone has a diffusion flame structure. There is no indication of individual droplet burning. The results show that evaporation occurs close to the jet centerline rather than in the outer shear layer. Turbulence does not have a significant impact on the evaporation rates. A small fraction of the droplets escapes the reaction zone unburned along the centerline and persists far downstream of the flame tip. The proportion of this droplet residue increases with shorter residence times as observed for the higher velocity flame.
ISSN:0010-2180
1556-2921
DOI:10.1016/j.combustflame.2005.08.016