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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-04-21 and was most recently seen on 2026-04-21.
In combustion, flame stretch is a quantity which measures the amount of stretch of the flame surface due to curvature and due to the outer velocity field strain. The early concept of flame stretch was introduced by Karlovitz in 1953, although the correct definition was introduced by Forman A. Williams in 1975.
George H. Markstein studied flame stretch by treating the flame surface as a hydrodynamic discontinuity. The flame stretch is also discussed by Bernard Lewis and Guenther von Elbe in their book. All these discussions treated flame stretch as an effect of flow velocity gradients. The stretch can be found even if there is no velocity gradient, but due to the flame curvature. So, the definition required a more general formulation and its precise definition is given as the ratio of rate of change of flame surface area to the area itself
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