% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Nicolai:1052236,
      author       = {Nicolai, Hendrik and Schuh, Vinzenz and Bähr, Antonia and
                      Schneider, Max and Rong, Felix and Kaddar, Driss and Bode,
                      Mathis and Hasse, Christian},
      title        = {{L}aminar and turbulent hydrogen-enriched methane flames:
                      {I}nteraction of thermodiffusive instabilities and local
                      fuel demixing},
      journal      = {Proceedings of the Combustion Institute},
      volume       = {41},
      issn         = {1540-7489},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2026-00855},
      pages        = {105885},
      year         = {2025},
      abstract     = {Blending hydrogen with methane provides a practical
                      approach for transitioning existing energy infrastructure to
                      hydrogen-based carriers. However, under fuel-lean
                      conditions, increasing the hydrogen content causes flames to
                      transition rapidly from methane-like combustion to
                      hydrogen-dominated flames, primarily driven by
                      thermodiffusive instabilities that significantly enhance
                      turbulent flame speeds. This study systematically examines
                      lean methane/hydrogen/air flames of varying complexity, from
                      three-dimensional laminar unstable cases to turbulent jet
                      flames at two different Reynolds numbers, with an emphasis
                      on the impact of the distinct molecular transport properties
                      of hydrogen and methane. The large-scale simulations reveal
                      that these blends exhibit instabilities even under turbulent
                      conditions, albeit to a lesser degree than pure hydrogen
                      flames. Nonetheless, synergistic interactions between
                      turbulence and thermodiffusive instabilities lead to notable
                      increases in turbulent flame speed and reactivity factors
                      ($I_0$) at higher Reynolds/Karlovitz numbers. Moreover,
                      beyond the effects of overall non-unity Lewis number, the
                      different diffusivity of hydrogen and methane (i.e.,
                      non-equal Lewis numbers) significantly influence the
                      formation and intensity of intrinsic flame instabilities.
                      These findings underscore the importance of thermodiffusive
                      instabilities in methane/hydrogen combustion and highlight
                      the need for advanced modeling approaches capable of
                      capturing local demixing effects under turbulent flows
                      conditions.},
      cin          = {JSC},
      ddc          = {660},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {5112 - Cross-Domain Algorithms, Tools, Methods Labs (ATMLs)
                      and Research Groups (POF4-511) / Inno4Scale - Innovative
                      Algorithms for Applications on European Exascale
                      Supercomputers (101118139)},
      pid          = {G:(DE-HGF)POF4-5112 / G:(EU-Grant)101118139},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1016/j.proci.2025.105885},
      url          = {https://juser.fz-juelich.de/record/1052236},
}