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- W2077897397 abstract "A field-scale experimental study has been performed in an attempt to reproduce, in a 15 geometrical scale replica rig, the results of a previous study of large-scale explosion experiments involving mixtures of air and a predominantly methane fuel gas. Flame acceleration induced by propagation through repeated pipe arrays following either high-energy (venting of a confined explosion) or low-energy (spark) ignition was studied. Increasing the laminar burning velocity by enriching the air with oxygen, and roughening the obstacles in the scaled experiments, were used as ways of compensating for scale effects in the combustion processes. In the case of the highest energy ignition, which gave rise to the highest average flame speed, the full-scale overpressures could be reproduced closely provided that the laminar burning velocity of the small-scale mixture was increased by a factor 514(∼ 1.5). However, in the remaining experiments with high-energy ignition, which had lower average flame speeds, this level of oxygen enrichment gave rise to overpressures and flame speeds in excess of the full-scale. The smaller the full-scale flame speeds, the larger the factor of overprediction in overpressure, which took it largest value (∼ 5) for the low-energy-ignited experiments. It is concluded that the above scaling techniques will in general yield conservative estimates of full-scale explosion overpressures." @default.
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- W2077897397 date "1992-01-01" @default.
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- W2077897397 title "Experimental scaling of the flame acceleration phase of an explosion by changing fuel gas reactivity" @default.
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