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Computation of Forced Premixed Flames Dynamics

Ruan, S; Dunstan, TD; Swaminathan, N; Balachandran, R; (2016) Computation of Forced Premixed Flames Dynamics. Combustion Science and Technology , 188 (7) pp. 1115-1135. 10.1080/00102202.2016.1174117. Green open access

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Abstract

Bluff body stabilised turbulent premixed flames subject to inlet velocity oscillation over a wide range of forcing frequency and amplitude are simulated using a flamelet- based combustion model. Two sets of detailed chemical kinetic schemes are used to model combustion chemistry. It is observed that the computed dynamics of forced flames agree reasonably well with experimental measurements. The flame elongation and shortening at a frequency of 40 Hz and strong flame-vortex interaction at a higher frequency of 160 Hz are captured well in the computations. The global flame describing function extracted from the computational results shows a linear response at 40 Hz and a nonlinear behaviour at 160 Hz as observed in the experiments. The nonlinear re- sponse is due to vortex roll-up and its subsequent shedding. The quantitative agreement of the computed flame describing function (FDF) with experimental measurement is uniformly good over a wide range of forcing frequency and amplitude. Some influence of chemical kinetics on the FDFs is observed, which mainly stems from the difference in laminar burning velocity and spatial heat release rate distribution.

Type: Article
Title: Computation of Forced Premixed Flames Dynamics
Open access status: An open access version is available from UCL Discovery
DOI: 10.1080/00102202.2016.1174117
Publisher version: http://dx.doi.org/10.1080/00102202.2016.1174117
Language: English
Additional information: This is an Accepted Manuscript of an article published by Taylor & Francis in Combustion Science and Technology on 14 April 2016, available online: http://dx.doi.org/10.1080/00102202.2016.1174117.
Keywords: Turbulent premixed flame, Detailed chemistry effect, Flame Describing Function (FDF), combustion instability
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1482151
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