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@ARTICLE{Herff:1009745,
      author       = {Herff, S. and Pausch, Konrad and Lintermann, Andreas and
                      Schröder, W.},
      title        = {{I}mpact of the injector lateral offset on the dynamics of
                      a lean premixed flame and the thermoacoustic stability of a
                      burner},
      journal      = {Combustion and flame},
      volume       = {256},
      issn         = {0010-2180},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2023-02965},
      pages        = {112995},
      year         = {2023},
      abstract     = {The response of a laminar lean premixed flame to
                      excitations based on its position in the combustion chamber
                      and the stability of a burner are numerically investigated.
                      A finite-volume large-eddy simulation method is used to
                      solve the compressible Navier-Stokes equations and a
                      combined G-equation progress variable approach is used to
                      model the flame. Various injector positions in the
                      combustion chamber are investigated in a computational setup
                      with an acoustically non-reflecting outflow boundary
                      condition to analyze the impact on the response of the flame
                      to an external excitation. Due to the changes in the flow
                      field the shape of the flames depends on the displacement
                      offset of the injector. Consequently, the instantaneous,
                      local distribution of the heat release rate fluctuations
                      which is caused by wrinkles on the flame surface is
                      determined by the position of the injector. The heat release
                      rate fluctuations are the dominant source of sound in the
                      investigated configurations. Due to the discrepancies in the
                      local heat release rate fluctuations the flame response to
                      an excitation depends on the lateral offset of the injector.
                      The overall trend of the integrated heat release is the same
                      in most configurations, however, the phase is significantly
                      altered. Since the phase angle of the response of the flame
                      to an excitation determines the stability of a burner,
                      self-excited instabilities can be avoided by adjusting the
                      position of the injector. This is demonstrated using a
                      modified computational domain with an acoustically
                      reflecting outflow boundary condition, which causes the
                      burner to have an acoustic quarter-wave eigenmode. Based on
                      the results of the previous analysis of the flame responses,
                      two injector positions in the combustion chamber are chosen
                      such that the response of the flames is mutually
                      phase-shifted by approximately pi. Therefore, it is expected
                      that one of the configurations will lead to a stable burner
                      while the other one exhibits a self-excited instability. The
                      results show that the injector position determines the
                      stability of the burner configuration for the investigated
                      flames.},
      cin          = {JSC},
      ddc          = {620},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {5111 - Domain-Specific Simulation $\&$ Data Life Cycle Labs
                      (SDLs) and Research Groups (POF4-511) / 5112 - Cross-Domain
                      Algorithms, Tools, Methods Labs (ATMLs) and Research Groups
                      (POF4-511)},
      pid          = {G:(DE-HGF)POF4-5111 / G:(DE-HGF)POF4-5112},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001051604300001},
      doi          = {10.1016/j.combustflame.2023.112995},
      url          = {https://juser.fz-juelich.de/record/1009745},
}