Etude expérimentale de l'atomisation d'une nappe liquide avec et sans zone de pré-film en vue de sa modélisation - Influence des conditions limites

摘要

In the context of combustion for aeronautical engines, airblast injectors are used. A strong air flow perturbs the fuel, which is atomized in fine drops in combustion chamber. Modeling of this process requires a better understanding of mechanisms occurring during two fluid interaction and in particular boundary condition influence. The work realize during this PhD thesis corresponds to this problematic by studying flow thickness and air flow configuration influences as well as the one of the presence and the length of a prefilming zone.Development and improvement measure techniques have been necessary in order to characterize atomization process. Oscillation frequency, breakup length, liquid thickness and drop size measures have been realized what has enabled to highlight the influence of previously listed parameters. Correlations have been then proposed so as to predict process evolution according to boundary conditions of injection system.