Experimental Anaysis of Droplet Spatial Distribution in a Spray Burner
Résumé
A new experimental setup has been built to study spray combustion. The design corresponds to a squared-duct channel with a bluff-body spanning over the entire width of the channel. Turbulent flow circulates around the obstacle and liquid fuel is injected at the rear of the body through a flat- fan nozzle. The two-dimensional configuration has been chosen to facilitate the optical measurements. Operating conditions reproduce partially those met inside a turboreactor. Non-reacting and reacting flows have been experimentally characterized but the paper lays emphasis on the later case. Spatial distribution of the droplets has been investigated with respect to the inter-droplet distance to the nearest neighbour and to the spatial distribution law at six locations upstream of the bluff body. Inter-droplet distance is obtained through the processing of Mie scaterring data. For the distribution law, comparisons between the experimental distribution, the theoretical exponential distribution and numerical results from an in-house Monte-Carlo solver demonstrate that the droplet distribution is equivalent to the exponential distribution. Besides, the numerical approach has been used to estimate the errors associated with the inter-droplet distance.
Origine : Fichiers produits par l'(les) auteur(s)
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