Investigation of droplet combustion in strained counterflow diffusion flames using planar laser-induced fluorescence |
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Authors: | X Mercier M Orain F Grisch |
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Institution: | (1) Office National d’Etudes et de Recherches Aérospatiales, Fort de Palaiseau, 91761 Palaiseau Cedex, France |
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Abstract: | Experimental investigation of an isolated droplet burning in a convective flow is reported. Acetone droplets were injected
in a steady laminar diffusion counterflow flame operating with methane. Planar laser-induced fluorescence measurements applied
to OH radical and acetone was used to measure the spatial distribution of fuel vapour and the structure of the flame front
around the droplet. High-magnification optics was used in order to image flow areas with a ratio of 1:1.2. The different combustion
regimes of an isolated droplet could be observed from the configuration of the envelope flame to that of the boundary-layer
flame, and occurrence of these regimes was found to depend on the droplet Reynolds number. Experimental results were compared
with 1D numerical simulations using detailed chemistry for the configuration of the envelope flame. Good agreement was obtained
for the radial profile of both OH radical and fuel vapour. Influence of droplet dynamics on the counterflow flame front was
also investigated. Results show that the flame front could be strongly distorted by the droplet crossing. In particular, droplets
with high velocity led to local extinction of the flame front whereas droplets with low velocity could ignite within the flame
front and burn on the oxidiser side.
PACS 33.50.-j; 42.62.-b; 47.55.D-; 47.70.Pq; 47.80.Jk |
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