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Erschienen in:
2008 | OriginalPaper | Buchkapitel
Ignition of Droplets in a Laminar Convective Environment
verfasst von : Rainer Stauch, Ulrich Maas
Erschienen in: High Performance Computing in Science and Engineering `07
Verlag: Springer Berlin Heidelberg
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Numerical simulations of the ignition process of methanol and nheptane droplets in a laminar convective environment are performed using detailed reaction mechanisms and detailed transport models. The ignition delay time of a single droplet is found to decrease with increasing velocity of the convective gas flow. This decrease is attributed to the steepening of the spatial gradients of the profiles of physical variables, like species mass fractions or temperature. This steepening is originated by a stronger gas flow and leads to a speed-up of the physical transport processes. A downstream movement of the local ignition point with increasing flow velocity is observed. For higher flow velocities an ignition in the wake of the droplet followed by an upstream flame propagation is found. After ignition an envelope flame is formed. The structure of this envelope flame is studied.