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Large Eddy Simulation of a Bluff Body Stabilised Premixed Flame Using Flamelets.

James C Massey1, Ivan Langella1, Nedunchezhian Swaminathan1

  • 1Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, CB2 1PZ UK.

Flow, Turbulence and Combustion
|January 8, 2019
PubMed
Summary

Large Eddy Simulations accurately captured experimental data for unconfined turbulent flames. The study analyzed flame brush behavior and turbulent kinetic energy, comparing confined and unconfined flames.

Keywords:
Bluff bodyFlame stabilisationFlameletsLarge Eddy Simulation (LES)Turbulent premixed flames

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Area of Science:

  • Fluid Mechanics
  • Combustion Science
  • Turbulence Modeling

Background:

  • Turbulent flames stabilized behind bluff bodies are crucial in combustion research.
  • Understanding sub-grid scale combustion closure is vital for accurate simulations.
  • Comparing confined and unconfined flames provides insights into turbulence effects.

Purpose of the Study:

  • To perform Large Eddy Simulations of an unconfined turbulent lean premixed flame.
  • To validate simulation results against experimental data.
  • To analyze flame brush positioning and turbulent kinetic energy variations.

Main Methods:

  • Utilizing unstrained flamelets for sub-grid scale combustion closure.
  • Conducting Large Eddy Simulations (LES) for turbulent flow analysis.
  • Comparing simulation statistics with experimental observations.

Main Results:

  • The simulations successfully captured experimental observations of the flame.
  • Analysis revealed radial variations in turbulent kinetic energy across streamwise locations.
  • The positioning of shear layers relative to the flame brush was elucidated.

Conclusions:

  • Large Eddy Simulations with unstrained flamelets provide a reliable method for studying turbulent flames.
  • The study highlights the distinct roles of incoming and shear-driven turbulence in flame behavior.
  • Comparative analysis deepens the understanding of flame brush dynamics and turbulent kinetic energy distribution.