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Étude de l'ablation d'une paroi solide par un jet liquide

Abstract : In case of core meltdown in a sodium-cooled fast reactor (SFR), it is important to remove the corium, formed from the core. To do so, discharge tubes connecting the core to the sodium plenum can be implemented within the reactor core. They could drive the corium toward a core-catcher placed in the lower part of the vessel. As corium should spread on it, its cooling would be enhanced by increasing its exchange surface with surrounding sodium. Nevertheless, as the corium jet’s temperature would be above 2 000 K, the core-catcher could therefore undergo substantial thermal attack and be ablated. To improve understanding of the ablation process and to provide new validation data for CFD codes, an experimental setup using simulant materials (ie. water and transparent ice) was designed and built. It allows for realtime visualization of ablation. It is the first time that someone has obtained such data, to the best of our knowledge. During the PhD project, this setup named Hot AblatioN of a SOlid by a Liquid - Observations (HAnSoLO) was built. Ablation phenomenology was thus studied. Data were obtained on the ablation velocity along the jet axis and allowed for comparisons with some scaling laws from the literature. Then, an analysis of the cavity which helps understanding the local heat and mass transfer linked to thermal-hydraulics was undertaken. Finally, several new physical models were compared with experimental data. The experimental setup implemented, and the database will be the basis for future studies.
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https://hal.univ-lorraine.fr/tel-03203758
Contributor : Thèses Ul <>
Submitted on : Wednesday, April 21, 2021 - 8:58:33 AM
Last modification on : Thursday, April 22, 2021 - 3:32:20 AM
Long-term archiving on: : Thursday, July 22, 2021 - 6:13:12 PM

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  • HAL Id : tel-03203758, version 1

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Alexandre Lecoanet. Étude de l'ablation d'une paroi solide par un jet liquide. Milieux fluides et réactifs. Université de Lorraine, 2021. Français. ⟨NNT : 2021LORR0015⟩. ⟨tel-03203758⟩

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