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Gas turbine model combustor simulations

Gas turbine model combustor simulations are realised [1,2] using the commercial CFD software ANSYS® FLUENT®. For turbulence, the Reynolds Stress Model (RSM) or Detached Eddy Simulation (DES) models are applied. For combustionthe  Flamelet-Generated-Manifold [3] (FGM) model is implemented by Dacolt via user-defined libraries. The associated FGM tables are generated with TABKIN®, using the GRI 3.0 [4] reaction mechanism and Chem1D [5] flame solver.

Amongst others, the Precessing Vortex Core (PVC, green) flow structure is reproduced and its interaction with the flame (red, CH radical) is visualized in the animation below, for the URANS RSM+FGM case.

PVC / flame interaction

Comparison to experiments

A comparison between the predicted and measured temperature fields is shown in the figures below. It illustrates that the applied URANS RSM+FGM method already captures the jet opening quite well but overpredicts mixture equivalence ratio and hence temperature in the Central Recirculation Zone (CRZ). The DES+FGM method shows further refinement of this result with a very good prediction of the temperature field.

References

  1. P. Weigand et. al. Combust. Flame 144: 205-225 (2005).
  2. M. Wankhede et al., Proceedings of ASME Turbo Expo 2014, GT2014-25784 (2014)
  3. J.A. van Oijen and L.P.H. de Goey, Combust. Sci. Technol. 161 (2000), pp. 113-137.
  4. http://www.me.berkeley.edu/gri_mech/version30/text30.html
  5. http://www.tue.nl/en/university/departments/mechanical-engineering/research/research-groups/combustion-technology/research-activities/fgm/chem1d/