Evaporation of a single ethanol droplet interacting with a premixed laminar CH4/air flame
Résumé
Among all phenomena occurring in combustion chambers, one basic process is the interaction of a single droplet with a flamelet. Therefore, it is essential to understand the physics of individual droplet evaporation and its effects on the flame front to deal with more complex flames.
The aim of this study is to investigate the ethanol droplet evaporation interacting with a premixed laminar CH4/air flame. In the experimental part of the study, the droplet was injected into the flame and visualization of the flame front and temporal monitoring of the droplet evaporation were performed using planar laser tomography (PIV, PTV, ILIDS). In the numerical part of the study, single droplet evaporation under constant temperature and stagnant environment was studied via Eulerian-Lagrangian approach with YALES2 solver. The variations of the droplet and gas properties were computed under N2 atmosphere and flame conditions. From the vaporization rate calculations, it is observed that there is a slight effect of the flame stretch on the evaporation due to the change in temperature profiles. It is also observed that the flame temperature has a leading effect on the evaporation rate rather than the burnt gas composition due to the changes in thermo-physical properties.
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