Sanchez Bahoque, Gabriela

van Oijen, Jeroen A.

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 Preferential diffusion behavior of turbulent premixed hydrogencombustionCitation for published version (APA):Sanchez Bahoque, G., & van Oijen, J. A. (2023). Preferential diffusion behavior of turbulent premixed hydrogencombustion. In Proceedings of the 11th European Combustion Meeting 2023 (pp. 1-5). ECM Press.Document status and date:Published: 28/04/2023Document Version:Accepted manuscript including changes made at the peer-review stagePlease check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can beimportant differences between the submitted version and the official published version of record. Peopleinterested in the research are advised to contact the author for the final version of the publication, or visit theDOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and pagenumbers.Link to publicationGeneral rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            • Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            • You may not further distribute the material or use it for any profit-making activity or commercial gain            • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the “Taverne” license above, pleasefollow below link for the End User Agreement:www.tue.nl/taverneTake down policyIf you believe that this document breaches copyright please contact us at:openaccess@tue.nlproviding details and we will investigate your claim.Download date: 14. Jul. 2024Preferential diffusion behavior of turbulent premixed hydrogen combustionGabriela Sanchez Bahoque*, Jeroen van Oijen* g.e.sanchez.bahoque@tue.nl1-D stretched flameletsDNS of turbulent planar mixing layersPower and FlowDepartment of Mechanical Engineering11th European Combustion Meeting 2023 April 26-28, 2023 · Rouen · France𝑚𝑚b𝑚𝑚b0= 1 −Ka𝑖𝑖Le𝑖𝑖+ ∆ℎb𝜕𝜕𝜕𝜕ℎb0ln𝑚𝑚b0 + �𝑗𝑗=1𝑁𝑁𝑒𝑒𝑍𝑍𝑗𝑗,b𝜕𝜕𝜕𝜕𝑍𝑍𝑗𝑗,b0𝑙𝑙𝑙𝑙𝑚𝑚𝑏𝑏0Direct stretch effect Non-unity Lewis numbers effectMass burning rate 𝒎𝒎𝐛𝐛 of stretched flames [1] Regions with fuel enrichment by diffusion and accumulation of products.Scaled mass burning rate of 1-D freely propagating flames vs. Karlovitznumber Ka (dimensionless stretch rate), for different transport models:Contribution of changes hydrogen content 𝑍𝑍H , oxygen content 𝑍𝑍O andenthalpy ℎ to the mass burning rate:References[1] van Oijen et al. (2016). Prog. Energy Combust. Sci. 57, 30.FundingThe research leading to these results has received funding from the European Union’s Horizon2020 research and innovation programme under the CoEC project, grant agreement No 952181.Effect of increasing temperature• Enhanced burning rates• Larger scale structures• More equal distribution of source terms along the flame frontLean (𝝋𝝋 = 𝟎𝟎.𝟕𝟕) premixed hydrogen-air mixtures are studied in order to understand its combustion properties.• Simplest fuel to produce fromrenewable electricity.• Carbon-free.• High burning velocity Stabilizationproblems.• High diffusivity (Le ≈ 0.3).• Strong preferential diffusion effects. Hydrogen as alternative fuelCase T300 (Ref) T400U (m/s) 100 128H (mm) 2.0 2.6W (mm) 3.0 3.7T (K) 300 400sL (m/s) 1.236 2.130Rejet 10206 10206Dajet 0.07 0.11Variation of ZHand h along theflame front dueto stretch. Thisleads to higherburning rates.298 K1 atm600 K1 atm298 K2 atmImportant contribution from ∆𝑍𝑍Hand lower influence of ∆ℎContribution of ∆ℎ increases, compensating that of ∆𝑍𝑍HContribution of ∆𝑍𝑍H becomes more important than that of ∆ℎHigh preferential diffusionLowered preferential diffusionEnhanced preferential diffusionReference case ∆x = 25 μm∆𝑡𝑡 = 10 nsLe = 1Le ≠ 1Direct stretch effect 𝑚𝑚b decreases linearly with KaPreferential diffusion effects 𝑚𝑚b increases with respect to the unity Le caseConstant Le model + Soret diffusion Good approximation for leanH2 flames

Preferential diffusion behavior of turbulent premixed hydrogen combustion

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Preferential diffusion behavior of turbulent premixed hydrogen combustion

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