A numerical study of the behaviour of hydrogen in ventilated spaces
conference paper
In this paper we will discuss several tools to model and predict scenarios when a hydrogen leak occurs. The first tool used will be Computation Fluid Dynamics (CFD) the second one is HYRAM+ (Growth et al. 2017), an engineering tool based on publicly available data and models. The CFD model, built in ANSYS Fluent, was validated using experimental data and benchmark results of similar models (Giannissi et al. 2015). The validated model was subsequently used to investigate the effect of different leak rates and forced ventilation in a confined space, specifically a 12 foot container often used in maritime applications. These results were compared with the outcome of HYRAM+ and some differences with respect to layer height and H2 concentration were found, showing that HYRAM+ underestimates both. Finally, the outcome of a CFD dispersion simulation has been used as initial situation to model a scenario when a Hydrogen layer is ignited. The results show a fast propagation of the flame front and a significant increase in pressure inside the confined room. These results can be used as input parameters for an analysis of the structural integrity of the solid structure. The results of our investigation will show the applicability of CFD and other numerical tools for the early risk assessment of hydrogen-fuelled ships. In particular, the outcome can be used to design the fuel cell venti lation system and to perform the explosion risk assessment.
Topics
TNO Identifier
996557
Source title
MARTECH 2024, 7th International Conference on Maritime Technology and Engineering, 14-16 May 2024, Lisbon, Portugal
Collation
6 p.
Files
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