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Large Eddy simulation of a swirling flame response to swirl modulation with impact on combustion stability

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Author

Summary, in English

A swirl stabilized flame has been studied numerically using Large Eddy Simulation. The response of the flame to a large swirl number modulation has as been determined. Decreasing the swirl number moderately does not destabilize the flame. Decreasing further the swirl number induces a transition from stabilized to a jet flame with increase in the flame fluctuations. Increasing back the swirl restores the original configuration. However, the re-stabilization has been found to be considerably slower as compared to the burner aerodynamic time scale. Further studies, including identification of some characteristic turbulent structures, have been carried out. Both a helical and an axial mode have been identified. The helical mode arises in the central recirculation zone, whereas the axial mode arises in the outer shear-layer. Both modes are possible sources of thermo-acoustic instabilities.

Department/s

Publishing year

2005

Language

English

Pages

4929-4940

Publication/Series

43rd AIAA Aerospace Sciences Meeting and Exhibit - Meeting Papers

Document type

Conference paper

Publisher

American Institute of Aeronautics and Astronautics

Topic

  • Fluid Mechanics and Acoustics

Keywords

  • Swirl modulation
  • Swirl number
  • Large Eddy simulation (LES)
  • Swirling flame

Conference name

43rd AIAA Aerospace Sciences Meeting and Exhibit

Conference date

2005-01-10 - 2005-01-13

Conference place

Reno, NV, United States

Status

Published