Abstract
A brief review is presented of the state of the art of spray combustion modelling. Major remaining challenges are discussed. Droplet vaporization and heating models available for sub-grid modelling are discussed. In particular, we address the real aspects of spray combustion that make the standard textbook treatments irrelevant in practice: destruction of spherical symmetry by droplet motion, multicomponent fuel mixtures, transient droplet heating and vaporization, supercritical conditions at high operating pressures, and droplet-droplet interactions. Needs for improvement of sub-grid droplet vaporization and heating models are discussed. A new and useful theoretical perspective involving a contrived scalar quantity, known as the Super Scalar, is presented. The spray equations and their uses for Reynolds-averaged (RANS) flow analyses, large-eddy simulations (LES), and direct numerical simulations are reviewed. The alternative to spray combustion of fuel-film vaporization and combustion is discussed, especially with its advantages for miniature combustors. The progress on a first-principles alternative to the current empirical approach for setting the inflowing droplet-size distribution is reviewed.
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