Abstract
Experiments were performed on the response of a flame stabilized in the wake of a circular cylinder to sudden acceleration or deceleration of a free stream with the use of a shock tube with two diaphragms, which served as a short-duration wind tunnel and a generator of plane waves of regulated strength. Interesting features in the behavior of a wake flame subjected to acceleration were found, viz. the formation of a bottle neck contraction, its convection downstream, its growth with time and the splitting of the burnt-gas region, followed, at lower accelerations, by the development of a new flame and pressure oscillation. The extinction of combustion occurred at higher accelerations. On the other hand, a partial expansion of the burnt-gas region was found behind the flame holder when subjected to deceleration, but pressure oscillation and flash back were not observed.
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