Lean Flame Root Dynamics in a Gas Turbine Model Combustor
Publication Date
2019-06-03Journal Title
Combustion Science and Technology
ISSN
0010-2202
Publisher
Taylor & Francis
Volume
191
Issue
5-6
Pages
1019-1042
Type
Article
This Version
AM
Metadata
Show full item recordCitation
Massey, J. C., Chen, Z., & Swaminathan, S. (2019). Lean Flame Root Dynamics in a Gas Turbine Model Combustor. Combustion Science and Technology, 191 (5-6), 1019-1042. https://doi.org/10.1080/00102202.2019.1584616
Abstract
A swirl-stabilised flame close to blow-off conditions in a gas turbine model combustor is investigated using large eddy simulation. The sub-grid combustion is modelled using a presumed probability density function approach along with flamelets. Good comparisons between the computed and measured statistics are observed. This allows for a detailed investigation of the flame behaviour. Two distinct stages are noted for the flame behaviour. The flame has a steady and stable flame root anchored near the entrance to the burner, yielding a "V" shaped flame in Stage 1, and a transient lift-off event is observed in Stage 2. These two stages switch from one to the other, giving the unstable flame behaviour, as observed in the experimental studies. Further analysis of the simulations shows that large-scale scalar mixing plays a prominent role in the stabilisation of the flame and the entrainment of inflammable mixtures near the flame root location initiates the lift-off event.
Sponsorship
EPSRC DTP studentship (RG80792)
Funder references
Engineering and Physical Sciences Research Council (1619171)
EPSRC (EP/K025791/1)
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1080/00102202.2019.1584616
This record's URL: https://www.repository.cam.ac.uk/handle/1810/289849