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Simulation of Vorticity Driven Flame Instability Using a Flame Surface Density Approach Including Markstein Number Effects

[+] Author Affiliations
Torsten Voigt, Peter Habisreuther, Nikolaos Zarzalis

University of Karlsruhe (TH), Karlsruhe, Germany

Paper No. GT2009-59331, pp. 255-264; 10 pages
doi:10.1115/GT2009-59331
From:
  • ASME Turbo Expo 2009: Power for Land, Sea, and Air
  • Volume 2: Combustion, Fuels and Emissions
  • Orlando, Florida, USA, June 8–12, 2009
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4883-8 | eISBN: 978-0-7918-3849-5
  • Copyright © 2009 by ASME

abstract

The combustion induced and vorticity driven instability behaviour of a lean flame within a premixed combustion system under typical gas turbine conditions is investigated numerically. Over a wide range of operation conditions, the flame is stabilised by the well known mechanisms of premixed confined combustion systems interacting with a turbulent swirled flow field. However, the behaviour of the flame changes drastically just as a critical equivalence ratio is reached: the flame moves upstream close to the rotational axis at positions of originally highest downstream velocities. This flashback behaviour is known as combustion induced vortex breakdown (CIVB) [1] since the upstream propagation results from a local breakdown of the swirled flow field caused by the heat release. A Reynolds-Stress turbulence approach is used as closure model for the three dimensional uRANS simulations to capture the highly turbulent and exceedingly anisotropic flow field. In addition, a flame surface density (FSD) formulation is utilised for combustion modelling. Hence, the essential process of flame vortex interaction is considered in particular. This process is expressed by the important effects of flame strain and curvature and is directly taken into account by means of solving the Favre averaged area of flame surface with the aid of a transport equation. The considered stretch effects do not only influence the production and destruction of the flame surface but moreover modify the local heat release by altering the pseudo-chemical parameter of flame speed. This effect is captured through the Markstein number that is determined by preliminary flamelet calculations. The numerical results lead to the conclusion that the strained and re-orientated vorticity filaments are mainly responsible for the formation of locally negative velocities close to the rotational axis. The re-orientation and straining of vortex filaments is in turn controlled by the local heat release. Finally, the overall occurrence of the simulated flashback is in good accordance with the experiments but does also demonstrate the importance of strain effects on global flame behaviour.

Copyright © 2009 by ASME

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