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Numerical simulations of vented hydrogen deflagrations in a medium-scale enclosure

Tolias, I.C., Stewart, J.R., Newton, A., Keenan, J., Makarov, D., Hoyes, J.R., Molkov, V and Venetsanos, A.G. (2017) Numerical simulations of vented hydrogen deflagrations in a medium-scale enclosure. Journal of Loss Prevention in the Process Industries, N/A (N/A). N/A. [Journal article]

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URL: http://dx.doi.org/10.1016/j.jlp.2017.10.014

DOI: 10.1016/j.jlp.2017.10.014

Abstract

A validation study was performed to investigate the ability of Computational Fluid Dynamics (CFD) models to predict hydrogen deflagrations in vented enclosures. The validation exercise was aimed at assessing the suitability of CFD as a reliable tool for explosion safety assessments and involved comparing CFD predictions with measurements from an experiment carried out by FM Global in a 64 m3 enclosure. The enclosure included a large square vent located in the center of one of its walls. The enclosure was filled with a homogenous hydrogen-air mixture of 18% v/v composition before ignition at its center. In this paper, CFD model predictions of the transient pressure and the flame speed are compared against experimental measurements. Additionally, peak over-pressure predictions are compared against empirical correlations and the NFPA 68 vent sizing standard. The study focuses on the prediction of the first overpressure peak that is generated by external explosion. The agreement between the models’ predictions and experimental results is found to be satisfactory, which suggests that CFD models have the potential to predict explosion phenomena with reasonable accuracy. However, more extensive model validation and sensitivity studies are required before CFD models can be used with confidence in explosion safety assessments.

Item Type:Journal article
Keywords:CFD validation, FM Global experiment, vented hydrogen deflagration, external explosion, safety assessment
Faculties and Schools:Faculty of Art, Design and the Built Environment
Faculty of Art, Design and the Built Environment > School of the Built Environment
Research Institutes and Groups:Built Environment Research Institute
Built Environment Research Institute > Hydrogen Safety Engineering and Research Centre (HySAFER)
ID Code:39021
Deposited By: Dr Dmitriy Makarov
Deposited On:21 Nov 2017 13:54
Last Modified:21 Nov 2017 13:54

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