The influence of a bluff-body obstruction on the autoignition and flame acceleration of high-pressure hydrogen jets

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dc.contributor.authorWillmore, D.J.
dc.contributor.authorLau, T.C.W.
dc.contributor.authorMedwell, P.R.
dc.contributor.authorKildare, J.A.C.
dc.contributor.authorEvans, M.J.
dc.date.issued2024
dc.description.abstractThe release of high-pressure hydrogen is studied to develop the understanding of the potential for ignition and flame acceleration. Numerical simulations of the sudden release of 12.5 MPa hydrogen through a 7.5 mm orifice into a semi-enclosed concave domain are reported and analysed. An obstructing cylindrical bluff-body is positioned downstream of the hydrogen jet. Ignition was observed to be initiated through shock–shock intersection, regardless of obstruction. In addition to this, ignition due to bluff-body stagnation was observed. Intersection between the hydrogen jet, the shock-wave and the cylindrical bluff-body resulted in a localised heating at the stagnation point, forming a hot-spot which transitioned into a deflagration. The presence of an introduced bluff-body impingement promotes mixing, resulting in the deflagration undergoing significant flame acceleration and exceeding the local speed of sound. The absence of the impinging cylindrical bluff-body results in the shock-wave reaching the concave reflecting wall unobstructed, and the subsequent shock reflections from this surface self-intersect, providing the energy required for autoignition and consequent deflagration.
dc.description.statementofresponsibilityDavid J. Willmore, Timothy C.W. Lau, Paul R. Medwell, Jordan A.C. Kildare, Michael J. Evans
dc.identifier.citationInternational Journal of Hydrogen Energy, 2024; 110:336-344
dc.identifier.doi10.1016/j.ijhydene.2025.02.125
dc.identifier.issn0360-3199
dc.identifier.issn1879-3487
dc.identifier.orcidLau, T.C.W. [0000-0003-1851-706X]
dc.identifier.orcidMedwell, P.R. [0000-0002-2216-3033]
dc.identifier.orcidKildare, J.A.C. [0000-0002-2380-5755]
dc.identifier.urihttps://hdl.handle.net/2440/145795
dc.language.isoen
dc.publisherElsevier
dc.relation.grantARC
dc.rights© 2025 The Authors. Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
dc.source.urihttps://doi.org/10.1016/j.ijhydene.2025.02.125
dc.subjecthydrogen; autoignition; flame acceleration; bluff-body
dc.titleThe influence of a bluff-body obstruction on the autoignition and flame acceleration of high-pressure hydrogen jets
dc.typeJournal article
pubs.publication-statusPublished

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