Hydrogen Deflagration Simulations under Typical Containment Conditions for Nuclear Safety

This paper presents the modeling of low-concentration hydrogen deflagrations performed with the recently developed KYLCOM model. Three experiments carried out in THAI facility (performed in the frames of international OECD THAI experimental program) were selected for the simulation exercise. The tests allow studying lean mixture hydrogen combustion at normal ambient, elevated temperature and superheated and saturated conditions. The experimental conditions considered together with the facility size and shape grant a high relevance degree to the typical NPP containment conditions. The results of the simulations were thoroughly compared with the experimental data, and the comparison was supplemented by the analysis of the combustion regimes taking place in the considered tests. Results of the analysis demonstrated that despite the comparatively small difference in mixture properties, three different combustion regimes can be definitely identified.