Some types of gaseous explosions in industrial plants present a complex two-stage process when the explosion of the confined gases is associated with the explosion of the unburnt gases vented from the open areas of the plant. This paper describes a methodology for accounting for the dominant combustion/fluid dynamic processes involved in predicting the generation of overpressure from the external explosion, and its effect on the internal overpressure loading. A simple iterative process is used to solve the resultant system of first-order differential equations, which represent combustion in several regions of the external explosion. Reasonable qualitative agreement can be achieved with some large-scale experimental data, depending on choice of model parameters. Further validation work is planned to improve the robustness of the model, comparing predictions with those from CFD models and appropriate experimental data.
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