Abstract
The turbulent combustion processes within full annular PRECCINSTA combustor were investigated numerically in the present study. Dynamic thickened flame model was implemented to simulate the partially premixed turbulent methane-air combustion processes. The governing equations considering wall heat loss were solved by using the large eddy simulation method. In order to validate the implemented model, the temperature and main species distribution profiles within the burner were compared to the experimental data and good agreement was observed. The vortex motion characteristics of the cold flow field, the characteristics of the flame surface area, heat release rate and velocity vector changes with time during the circumferential cross-fire process were studied. Results showed that considering the wall heat loss significantly improved the prediction accuracy of the temperature and intermediate species distributions causing flame structure change from “M-shaped” to “V-shaped”. Numerical analysis proved that the circumferential velocity in different direction induced by the swirling flow near the inner and outer walls of the annular combustor are coupled with the combustion heat expansion, causing difference gain effects to the flame propagation on two sides of the combustor.
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