Erosion of a stratified layer by a diffuse buoyant jet controlled experimental parametric variations
Résumé
Nuclear engineering research groups were interested to the phenomena of the interaction between a rising jet and a stratified layer located above in order to better understand the mechanisms underlying hydrogen accumulation and dispersion in a nuclear reactor containment. In real containment configurations, obstacles such as pipes, components as pumps or reservoirs and walls are present, and they can dissipate the initial momentum of the gas release. Consequently, the upward flow pattern can be considered diffuse and buoyant, neither pure jet nor pure plume. Therefore, this challenging issue was part of a project called HYMERES, which has been launched and conducted in the OECD/NEA framework. Dedicated experiments were performed to study the interaction between a diffuse buoyant jet and two-layer stratification. In the large-scale MISTRA facility, the HM11 test series were conducted in which the erosive flow pattern came from a horizontal hot air jet impinging on a vertical cylinder. A CFD benchmark was organized based on these experimental results. A second series was conducted by CEA to study the effect of initial and boundary conditions by controlled parametric variations i.e. change of air injection flowrate and strength of the two-layer stratification. This new results are very interesting to challenge a CFD model tuned against HM1-1 results.
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