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Numerical Characterization of a Premixed Hydrogen Flame Under Conditions Close to Flashback

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Abstract

This work presents a numerical study of a technically premixed swirling combustor with central air injection at conditions close to flashback using large-eddy simulation with flamelet modelling. This burner has the characteristics of showing flashback at low equivalence ratios, so numerical simulations are set to identify the mechanisms behind the flashback formation. Experimental findings suggest the axial momentum ratio between fuel and air dominates the flame stabilization mechanism and flashback resistance over mixing and equivalence ratio fluctuations. This aspect is investigated here for two operating conditions with the same axial momentum ratio as in the experiment using a perfectly premixed assumption. The two test cases correspond to two stable operating points, far and close to the flashback point. The study shows the assumption of perfect premixing is valid during the stable operation of the burner up to flashback conditions. The experimental results are well predicted under inert and reacting conditions by using a perfectly premixed mixture. It is found that the non reacting flow field develops a self-excited oscillation in the form of a precessing vortex core. This oscillation is attenuated by the fuel injection due to the respective increase in axial momentum and it is ultimately suppressed in the reacting flow field. Both experiments and simulations confirm the same trends. The analysis of the flames have shown certain dynamics as the flashback point is approached. The flashback resistance of the burner is minimized due to an increase in the velocity deficit of the incoming mixture. The recirculation region is shifted upstream, the central recirculation is altered and the flame position is displaced towards the inlet of the reactants in the combustion chamber. The analysis of instabilities and flow dynamics suggest that the formation of flashback can be attributed to combustion induced vortex breakdown, which in turn is associated to the lower axial momentum introduced by the fuel jets in leaner conditions.

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Acknowledgements

Daniel Mira acknowledges the Juan de la Cierva personal grant IJCI-2015-26686 and Ambrus Both the Marie Sk\l odowska-Curie grant Agreement No. 713673 through the "la Caixa" INPhINIT Fellowship Grant. Computer resources and technical assistance has been provided by the Red Espa\~nola de Supercomputaci\'on (RES) and the Gauss Centre for Supercomputing e.V. (www.gauss-centre.eu) on the GCS Supercomputer SuperMUC at Leibniz Supercomputing Centre (www.lrz.de). The TU Berlin would like to acknowledge the funding received from the EU Seventh Framework Program (FP7/2007-2013) under GA284636 and the European Research Council under the ERC GREENEST with GA247322.

Funding

The research leading to these results has received funding through the Spanish Ministry of Economy and Competitiveness in the frame of the CHEST Project (TRA2017-89139-C2-2-R).

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Authors and Affiliations

  1. CASE Department, Barcelona Supercomputing Centre, Barcelona, Spain

    D. Mira, O. Lehmkuhl, A. Both, M. Vázquez & G. Houzeaux

  2. Hermann-Föttinger-Institut, Technische Universität Berlin, Berlin, Germany

    P. Stathopoulos, T. Tanneberger, T. G. Reichel & C. O. Paschereit

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  1. D. Mira
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  2. O. Lehmkuhl
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  3. A. Both
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  4. P. Stathopoulos
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  5. T. Tanneberger
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  6. T. G. Reichel
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  7. C. O. Paschereit
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  8. M. Vázquez
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  9. G. Houzeaux
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Correspondence to D. Mira.

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Mira, D., Lehmkuhl, O., Both, A. et al. Numerical Characterization of a Premixed Hydrogen Flame Under Conditions Close to Flashback. Flow Turbulence Combust 104, 479–507 (2020). https://doi.org/10.1007/s10494-019-00106-z

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