Interaction of a polydisperse spray with vortices |
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Authors: | C Lacour D Durox S Ducruix M Massot |
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Affiliation: | 1.Laboratoire EM2C. CNRS et école Centrale Paris,Chatenay-Malabry,France;2.CORIA CNRS UMR6614 Site Universitaire du Madrillet,St Etienne du Rouvray Cedex,France |
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Abstract: | The objective of the present work is to provide, through the association of optical diagnostics on a well-chosen experimental
configuration, new insights into the coupling of a vortical gaseous flow with a polydisperse evaporating spray representative
of practical injections. A cloud of droplets is injected in an inert laminar round jet, axisymmetric and pulsated, enabling
the study of the interaction of strong-vorticity structures with a polydisperse spray. The experiment is a laboratory-scale
representation of realistic injection configurations such as in engine combustion chambers or industrial burners. The chosen
set-up leads to a well-controlled configuration and allows the coupling of two optical diagnostics, particle imaging velocimetry
(PIV) and interferometric particle imaging (IPI), which leads to the study of both the flow dynamic and the droplet size distribution.
The behaviour of droplets is analysed regarding their relaxing and evaporating properties. Size-conditioned preferential concentration
of both weakly evaporating and strongly evaporating sprays is investigated. Droplet trajectories are also analysed by means
of high-rate tomographic visualizations. The time history between their ejection from the nozzle and their interaction with
the vortex is strongly related to the droplet preferential concentration and the observed heterogeneous repartition in the
gas flow. |
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