Abstract
Combustion experiments were carried out in a 2.3-m diameter spherical vessel with venting to the atmosphere over a hydrogen concentration range of6 to 20% by volume. Three vent sizes (15 em, 25 cm and 45 em) and three igniter locations (near-vent, centre and far-vent) were employed. The vents were initially covered with cardboard or aluminum foil that ruptured between I and 10 kPa. It was found that venting was effective in reducing the peak pressure at low hydrogen concentrations and for large vent areas for which the combustion times were much longer than the characteristic vent times. In all cases, central ignition led to the highest peak pressures and shortest combustion times, and near-vent ignition resulted in the lowest peak pressures and longest combustion times. Instabilities and turbulence caused by the vent opening resulted in enhanced burning rates. A simple one-dimensional model produced results in reasonable agreement with the experimental pressure transients when two burning rates (a lamina...
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