Ramaekers, Giel

Reintjes, M.

Tap, Ferry

van Oijen, Jeroen

English

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 Combustion in swirling flows, modelling of premixed turbulentcombustion in swirling flows using large eddy simulations andtabulated chemistryCitation for published version (APA):Reintjes, M., Ramaekers, G., van Oijen, J., & Tap, F. (2015). Combustion in swirling flows, modelling ofpremixed turbulent combustion in swirling flows using large eddy simulations and tabulated chemistry. In Book ofAbstracts COMBURA 2015, 7-8 October 2015, Soesterberg, The NetherlandsDocument status and date:Published: 08/10/2015Document Version:Publisher’s PDF, also known as Version of Record (includes final page, issue and volume numbers)Please 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: 17. Nov. 2023Reintjes M.*, Ramaekers W.J.S., van Oijen J.A., Tap F.A. ‘Combustion in Swirling Flows, Modelling of Premixed Turbulent Combustion in Swirling Flows using Large Eddy Simulations and Tabulated Chemistry’ Technische Universiteit Eindhoven, (2015)  Abstract Modern industrial burners often operate under lean (sub-stoichiometric) conditions. This reduces the production of harmful pollutants, but decreases the stability of combustion. Flame stabilization is achieved by introducing a swirling motion to the flow. This motion creates a recirculation zone that transports heat and active chemical species back to the flame front. However, predicting the stability and behaviour of these flames is not straight-forward. The swirling flow-flame interaction is very complex and the flow is often highly turbulent. Modelling this phenomenon can be achieved by running a Large Eddy Simulation (LES), an unsteady numerical technique in which the large turbulent flow structures are resolved and smaller ones are modelled.  In this work, the problem of modelling a turbulent swirling reacting flow is tackled by first separating the problem into two test cases; one for the turbulent swirling flow and the other of the combustion chemistry. In the first case, a cold turbulent swirling flow has been modelled with time-dependent LES using the open source CFD package OpenFOAM®. Based on comparisons to experimental data, the LES results accurately predicted velocity profiles as well as key flow features, such as the recirculation zone and the Precessing Vortex Core (PVC).  For the second case a Direct Numerical Simulation (DNS) of a laminar premixed lean methane/air flame has been computed using the Flamelet-Generated Manifold (FGM) technique [1]. This technique solves the chemistry solution offline and stores it in a table to be used during the simulation. The implementation into the CFD has been achieved using Tabkin© by Dacolt [2]. The effectiveness of FGM is demonstrated by comparing the results of the laminar flame to detailed chemistry solutions. The results are nearly identical, with the FGM result being computed almost 7 times faster. Such a speedup is crucial when attempting to model larger practical flames. Finally, a numerical study is conducted on the Cambridge-Sandia Swirl Burner [3] using the ‘best-practice’ methods from the two cases above. The results of this simulation campaign have been presented on the poster. Without tuning model parameters and within reasonable computational effort, the model is able to correctly predict both the swirling flow and important flame characteristics, such as the flame angle. Also, as a large part of the turbulence is resolved by the LES approach, both average values as well as fluctuations in v elocity, temperature and equivalence ratio are accurately predicted. The results of this simulation campaign showcases the potential of the model for further developments in gas turbine combustors. This work has been supported by Dacolt Combustion & CFD and the University of Technology Eindhoven. The financial compensation during this project by the Nederlandse Vereniging voor Vlamonderzoek has been greatly appreciated.    [1] Van Oijen J. A., “Flamelet-Generated Manifolds: Development and Application to Premixed Laminar Flames”, Technische Universiteit Eindhoven, (2002)   [2] Tap F., Schapotschnikow P., “Efficient Combustion Modeling Based on Tabkin CFD Look-up Tables: A Case Study of a Lifted Diesel Spray Flame”, SAE 10.4271/2012-01-0152 (2012)   [3] M.S. Sweeney, S. Hochgreb, M.J. Dunn, R.S. Barlow, “The structure of turbulent stratified and premixed methane/air flames II: Swirling flows”, Combustion and Flame. 159 2912–2929, (2012)   

Combustion in swirling flows, modelling of premixed turbulent combustion in swirling flows using large eddy simulations and tabulated chemistry

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Combustion in swirling flows, modelling of premixed turbulent combustion in swirling flows using large eddy simulations and tabulated chemistry

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