Abstract
Experiments on the deflagration to detonation transition (DDT) in gas mixtures in open space are carried out. Turbulent flames are accelerated by several grids repeatedly placed on the bases of the idea of a positive feed back mechanism. This experimental technique makes us possible to control the propagation velocity. The acceleration in methane/oxygen mixtures are compared with those in ethane/oxygen systems to investigate the parameters on the sensitivity of DDT. It is found that the DDT in the methane/oxygen mixtures can be made even in the open space, although the flames have to be highly accelerated to form shock + flame structures. The mechanism of the acceleration of the methane flames are no different from those of the ethane flames. The small explosions appearing in the turbulent flames of the methane mixtures are fewer in number than those of the ethane mixtures which may be connected with the DDT sensitivity.
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