Abstract
This paper investigates the aerodynamics of a gas jet emerging from a guillotine tube type breach and flowing across the bundle of tubes of the break stage of a failed and dry steam generator under severe accident SGTR conditions. The scenario has been modeled with the FLUENT 6.2 code and its predictions have been proven to be grid independent and consistent with the experimental data available. The 3D analyses include: the influence of the inlet ReD (from 7.7×104 to 2.6×105) and the effect of the breach shape (guillotine and fish-mouth) on the jet topology. The results show that the breach shape heavily determines the jet topology: a guillotine breach results in quasi-parabolic jets with azimuthal symmetry, whereas fish-mouth jets are deeper and spread over a rather small angle. Normalized velocity profiles are found to be self similar with respect to ReD. Finally, velocities in both cases have been correlated as a function of spatial coordinates and initial velocity. A potential application of these expressions in the nuclear safety field is discussed.
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