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Hydrogen injection in an air-filled two-vented cavity: numerical simulations, experimental comparisons and 1D modelling

Yanshu Wang 1, 2
1 LIEFT - Laboratoire d’Instrumentation et d’Expérimentation en mécanique des Fluides et Thermo-hydraulique
STMF - Service de Thermo-hydraulique et de Mécanique des Fluides : DEN/DM2S/STMF
2 COMET - COuplages Multiphysiques Et Transferts
LISN - Laboratoire Interdisciplinaire des Sciences du Numérique, M.-E. - Mécanique-Energétique
Abstract : Hydrogen is considered as one of the green and alternative energy sources because of its low CO2 emission. Due to the high risk of deflagration and detonation of air-hydrogen mixture, appropriate safety measures are required for its practical use. We are interested in a configuration modelling the distribution of hydrogen (or helium) in accidental release situation for confined environments. Direct numerical simulations (DNS) of a turbulent hydrogen jet in a two-vented cavity are performed, leading to the establishment of a bilayer hydrogen distribution with a homogeneous top layer on average. Numerical results are compared with Particle Image Velocimetry (PIV) measurements for validation. The flow is then analysed. In order to assess the relevance of the predictive ventilation models proposed in the literature to evaluate the installation safety, the DNS fields are integrated to calculate the characteristic quantities of the jet and of the hydrogen distribution. These results are compared to simplified natural ventilation models based on different turbulent jet models. These models are developed on the basis of a series of assumptions the validity of which is examined. The influence of the jet entrainment coefficient and its estimation methods are discussed, (i) in the context of turbulent jet models with constant or variable coefficient, (ii) under Boussinesq approximation or with consideration of the mixture density variation. Finally, modified formulations of the ventilation models are proposed to adapt them to the case of hydrogen injection in a two-vent cavity.
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Submitted on : Thursday, July 15, 2021 - 10:57:16 AM
Last modification on : Tuesday, January 4, 2022 - 6:06:55 AM
Long-term archiving on: : Saturday, October 16, 2021 - 6:20:16 PM

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  • HAL Id : tel-03286820, version 1

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Yanshu Wang. Hydrogen injection in an air-filled two-vented cavity: numerical simulations, experimental comparisons and 1D modelling. Fluids mechanics [physics.class-ph]. Sorbonne Université, 2021. English. ⟨tel-03286820⟩

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