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Numerical investigation demonstrates droplet size alters flame propagation speed in ethanol/air mists, suggesting a correlation governed by evaporation Damköhler numbers.
The flame propagation speed is a fundamental quantity for the theory of premixed combustion, as it links chemical kinetics and molecular transport for a specific mixture. Injecting a portion of the fuel as liquid droplets can significantly alter this property. We report on the droplet size effect on the flame propagation speed in an example of an ethanol/air mist flame in a Bunsen burner configuration. Based on parametric numerical investigations, a general correlation is suggested between the mean flame propagation speed and the droplet size for monodisperse fuel mist, using a Damköhler number for the evaporation time.
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Ponomarev et al. (2026) studied this question.
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