Abstract
The present study is performed to investigate experimentally the deflagration flame of hydrogen-propane-air mixtures propagating in a narrow space simulated channel ( t10×w150×h500 mm ) with special attention to flame acceleration and deceleration. In order to examine the effects of C3H8 addition and the grids on the flame propagation speed, the mixtures with different equivalence ratios (ϕ=0.8~1.4) with different propane additional rates (δp=0.2~1.0) are prepared. The flame shape and propagation speeds are obtained by using sequential shadowgraph or schlieren images recorded under conditions which are the ignition near the bottom and the upper-end open of channel. It was found that as the additional rate of C3H8 increase, the acceleration of flame propagation tends to be suppressed, especially for lean mixtures.
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