Abstract
This paper reports on an investigation of the influence of obstacles on the propagation of freely expanding cylindrical flames. The flame speed is found to depend critically on the obstacle configuration and flame speeds up to 130 m/sec in stoichiometric methane-air mixtures are readily achieved by placing appropriate turbulence producing obstacles in the flame path. This is ∼ 24 times the flame speed observed with no obstacles. The dramatic influence of obstacles is interpreted in terms of the positive feedback coupling between the flame itself and the turbulence and flow field distortions produced by the obstacles. It is also shown that the flame is unable to maintain its large turbulent flame speed without repeated obstacles to provide flow field distortions and turbulence continuously.
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