DNS of a Simplified Gas Turbine Premixer: Auto-Ignition and Flame Stabilization

Martin Vabre, Bruno Savard, Marc Day, Gilles Bourque, Sandeep Jella, Phillipe Versailles

Research output: NRELPoster


With the increasing need for fuel-flexibility, an understanding of auto-ignition inside gas turbine premixers is crucial. Direct numerical simulation (DNS) is a great tool to reveal the fine grain details of physics inside the premixer and guide the choice of the models to use for less expensive simulations. We present numerical simulations of a simplified and downscaled premixer, with multiple air jets in rich fuel crossflow. The simulations show intense fuel-air mixing and flame-turbulence interaction. We examine flow acceleration by the incoming jets, and the combustion within the device. We observe low-temperature and high-temperature combustion signatures, and compute the flame index to quantify local stabilization modes.
Original languageAmerican English
StatePublished - 2023

Publication series

NamePresented at the Internal Academic Conference at Polytechnique Montreal, 27 March 2023, Montreal, Canada

NREL Publication Number

  • NREL/PO-2C00-85712


  • combustion
  • gas turbine premixer
  • low mach number
  • PeleLMeX


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