NOx emissions predictions for a hydrogen micromix combustion system

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dc.contributor.authorBabazzi, Giulia
dc.contributor.authorGauthier, Pierre Q.
dc.contributor.authorAgarwal, Parash
dc.contributor.authorMcClure, Jonathan
dc.contributor.authorSethi, Vishal
dc.date.accessioned2020-05-06T11:52:49Z
dc.date.available2020-05-06T11:52:49Z
dc.date.issued2019-11-05
dc.description.abstractBeing free from carbon content, hydrogen has been considered as a promising candidate to reduce pollutant emissions in Gas Turbine Combustion Systems. Due to hydrogen’s significantly different burning characteristics, its implementation requires adjustments to the design philosophies of traditional combustion chambers. The micromix concept offers an alternative diffusive combustion injection system, improving the mixing characteristics without the risk associated with pre-mixing, thereby reducing the likelihood of hotspots forming. The importance of turbulence-chemistry interaction modelling, particularly for highly diffusive flames such as hydrogen, has been widely addressed. A turbulence-chemistry interaction study on such a micromix injector was performed investigating the coupling between the Flamelet Generated Manifold (FGM) combustion model and different hydrogen reaction mechanisms. This methodology correctly reproduces the typical micromix micro-flame behaviour and the analysed mechanisms are shown to be in good agreement in terms of flow characteristics prediction. A comparative study between two reduced order emissions prediction models was then carried out: a CFD post-processing technique for NOx emissions calculations and a hybrid CFD-CRN approach were explored. Due to the coupling between accurate turbulence-chemistry interaction modelling and the ability to handle detailed chemistry, the hybrid CFD-CRN approach gives valuable results with a modest computational cost and it could be used as an optimising tool during the injector geometry design process.en_UK
dc.identifier.citationBabazzi G, Gauthier PQ, Agarwal P, et al., (2019) NOx emissions predictions for a hydrogen micromix combustion system. In: ASME Turbo Expo 2019, 17-21 June 2019, Phoenix, Arizona, Paper number GT2019-90532en_UK
dc.identifier.isbn978-0-7918-5860-8
dc.identifier.urihttps://doi.org/10.1115/GT2019-90532
dc.identifier.urihttps://https://asmedigitalcollection.asme.org/GT/proceedings/GT2019/58608/V003T03A008/1066603
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/15435
dc.language.isoenen_UK
dc.publisherASMEen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectFlamelet generated manifolden_UK
dc.subjectEjectorsen_UK
dc.subjectTurbulenceen_UK
dc.subjectComputational fluid dynamicsen_UK
dc.subjectCombustionen_UK
dc.subjectNitrogen oxidesen_UK
dc.subjectHydrogenen_UK
dc.subjectEmissionsen_UK
dc.subjectCombustion systemsen_UK
dc.subjectFlow (Dynamics)en_UK
dc.subjectGas turbinesen_UK
dc.titleNOx emissions predictions for a hydrogen micromix combustion systemen_UK
dc.typeConference paperen_UK

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