The burning behavior of fast deflagrations and detonations was investigated for premixed H2-air flames partially diluted with additives in an explosion-tube. The flame was accelerated after ignition by means of a cascade of obstacles. The structure of the reaction-zone was determined by means of the planar laser-induced predissociation fluorescence, whereas the shape of both flame-front and shock-waves was investigated my means of the color-schlieren technique in the unblocked tube-section. On the basis of the obtained experimental results, quantitative criteria for the onset of slow and fast deflagrations as well as shock-induced combustion phenomena (spin-/marginal-detonations, planar cellular detonations) were obtained. The maximum pressure-loads were observed at the tube-end for fast deflagrations.
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The burning behavior of fast deflagrations and detonations was investigated for premixed H2-air flames partially diluted with additives in an explosion-tube. The flame was accelerated after ignition by means of a cascade of obstacles. The structure of the reaction-zone was determined by means of the planar laser-induced predissociation fluorescence, whereas the shape of both flame-front and shock-waves was investigated my means of the color-schlieren technique in the unblocked tube-section....
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