Comparison of tabulated and complex chemistry turbulent-chemistry interaction models with high fidelity large eddy simulations on hydrogen flames

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dc.contributor.authorZghal, M.
dc.contributor.authorSun, Xiaoxiao
dc.contributor.authorGauthier, Pierre Q.
dc.contributor.authorSethi, Vishal
dc.date.accessioned2021-05-17T09:21:21Z
dc.date.available2021-05-17T09:21:21Z
dc.date.issued2021-01-11
dc.description.abstractHydrogen micromix combustion is a promising concept to reduce the environmental impact of both aero and land-based gas turbines by delivering carbon-free and ultra-low-NOx combustion without the risk of autoignition or flashback. The EU H2020 ENABLEH2 project aims to demonstrate the feasibility of such a switch to hydrogen for civil aviation, within which the micromix combustion, as a key enabling technology, will be matured to TRL3. The micromix combustor comprises thousands of small diffusion flames where air and fuel are mixed in a crossflow pattern. This technology is based on the idea of minimizing the scale of mixing to maximize mixing intensity. The high-reactivity and wide flammability limits of hydrogen in a micromix combustor can produce short and low-temperature small diffusion flames in lean overall equivalence ratios. In order to mature the hydrogen micromix combustion technology, high quality numerical simulations of the resulting short, thin and highly dynamic hydrogen flames, as well as predictions of combustion species, are essential. In fact, one of the biggest challenges for current CFD has been to accurately model this combustion phenomenon. The Flamelet Generated Manifold (FGM) model is a combustion model that has been used in the past decades for its predicting capabilities and its low computational cost due to its reliance on pre-tabulated combustion chemistry, instead of directly integrating detailed chemistry mechanisms. However, this trade for a lower computational cost may have an impact on the solution, especially when considering a fuel such as Hydrogen. Therefore, it is necessary to compare the FGM model to another combustion modelling approach which uses more detailed complex chemistry. The main focus of this paper then, is to compare the flame characteristics in terms of position, thickness, length, temperature and emissions obtained from LES simulations done with the FGM model, to the results obtained with more complex chemistry models, for hydrogen micromix flames. This will be done using STAR-CCM+ to determine the most suitable numerical approach required for the design of injection systems for ultra-low NOx.en_UK
dc.identifier.citationZghal M, Sun X, Gauthier PQ, Sethi V. (2021) Comparison of tabulated and complex chemistry turbulent-chemistry interaction models with high fidelity large eddy simulations on hydrogen flames. In: ASME TurboExpo 2020, 21-25 September 2020, London, Virtual Event. Paper number GT2020-16070en_UK
dc.identifier.isbn978-0-7918-8411-9
dc.identifier.urihttps://doi.org/10.1115/GT2020-16070
dc.identifier.urihttps://asmedigitalcollection.asme.org/GT/proceedings/GT2020/84119/V003T03A014/1094633
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/16689
dc.language.isoenen_UK
dc.publisherAmerican Society of Mechanical Engineersen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjecthydrogenen_UK
dc.subjectmicromixen_UK
dc.subjectcombustionen_UK
dc.subjectENABLEH2en_UK
dc.subjectSTAR-CCM+en_UK
dc.subjectFGM kinetic rateen_UK
dc.subjectthickened flameen_UK
dc.subjectcomplex chemistryen_UK
dc.subjecteddy dissipation concepten_UK
dc.titleComparison of tabulated and complex chemistry turbulent-chemistry interaction models with high fidelity large eddy simulations on hydrogen flamesen_UK
dc.typeConference paperen_UK

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