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Multidimensional Simulation of Hydrogen Distribution and Combustion in Severe Accidents

Funded under: FP5-EAECTP C


The HYCOM project, an EC Cost Shared Action, was carried out with contributions from six organisations, which included research and expert organisations as well as industry. The project aimed at extension of the experimental data base which is needed for the verification of newly developed analysis methods and codes to predict hydrogen combustion behaviour and corresponding loads on representative scale. An experimental programme in medium and large scale facilities has been performed with combustion modes, ranging from slow to fast turbulent deflagration, that were not yet covered by previous experiments. The main focus was on complex, multi-compartment geometry and on inhomogeneous hydrogen concentrations in dry test atmospheres and at ambient temperatures, which allowed precise definition of the initial and boundary conditions. Detailed data were obtained revealing specific effects of scale, multi-compartent geometry and venting. It was observed that the flow geometry has some influence on critical conditions for fast combustion regimes, however applicability of the sigma-criterium was confirmed also for complex enclosures.

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