Comparison of hydrogen micromix flame transfer functions determined using RANS and LES

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dc.contributor.authorMcClure, Jonathan
dc.contributor.authorAbbott, David
dc.contributor.authorAgarwal, Parash
dc.contributor.authorSun, Xiaoxiao
dc.contributor.authorBabazzi, Giulia
dc.contributor.authorSethi, Vishal
dc.contributor.authorGauthier, Pierre Q.
dc.date.accessioned2020-05-06T11:07:18Z
dc.date.available2020-05-06T11:07:18Z
dc.date.issued2019-11-05
dc.description.abstractHydrogen has been proposed as an alternative fuel to meet long term emissions and sustainability targets, however due to the characteristics of hydrogen significant modifications to the combustion system are required. The micromix concept utilises a large number of miniaturised diffusion flames to improve mixing, removing the potential for local stoichiometric pockets, flash-back and autoignition. No publicly available studies have yet investigated the thermoacoustic stability of these combustion systems, however due to similarities with lean-premixed combustors which have suffered significant thermoacoustic issues, this risk should not be neglected. Two approaches have been investigated for estimating flame response to acoustic excitations of a single hydrogen micromix injector element. The first uses analytical expressions for the flame transfer function with constants obtained from RANS CFD while the second determines the flame transfer function directly using unsteady LES CFD. Results show the typical form of the flame transfer function but suggest micromix combustors may be more susceptible to higher frequency instabilities than conventional combustion systems. Additionally, the flame transfer function estimated using RANS CFD is broadly similar to that of the LES approach, therefore this may be suitable for use as a preliminary design tool due to its relatively low computational expense.en_UK
dc.identifier.citationMcClure J, Abbott D, Agarwal P, et al., (2019) Comparison of hydrogen micromix flame transfer functions determined using RANS and LES. In: ASME Turbo Expo 2019, 17-21 June 2019, Phoenix, Arizona, USA, Paper number GT2019-90538en_UK
dc.identifier.isbn978-0-7918-5860-8
dc.identifier.urihttps;//doi.org/10.1115/GT2019-90538
dc.identifier.urihttps://asmedigitalcollection.asme.org/GT/proceedings/GT2019/58608/V003T03A009/1066620
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/15434
dc.language.isoenen_UK
dc.publisherASMEen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectCombustion chambersen_UK
dc.subjectComputational fluid dynamicsen_UK
dc.subjectCombustion systemsen_UK
dc.subjectTransfer functionsen_UK
dc.subjectReynolds-averaged Navier–Stokes equationsen_UK
dc.subjectHydrogenen_UK
dc.subjectFlamesen_UK
dc.titleComparison of hydrogen micromix flame transfer functions determined using RANS and LESen_UK
dc.typeConference paperen_UK

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