Abstract
In the present work, Large Eddy Simulation (LES) coupled with a detailed propane/air mechanism and Adaptive Mesh Refinement (AMR) is employed to simulate the ignition procedure in a laboratory scale annular combustion chamber with sixteen swirling injectors. The numerical results are validated by comparing with the available experimental data, and also compared with previous numerical results of Unsteady Reynolds-Averaged Navier-Stokes (URANS). The main flow structures prior to ignition and flame propagation during the reacting phase are analyzed in detail. Particularly, some important characteristics of the light-round sequence, such as the light-round time, the flame dynamics, the morphology of flame front and the interactions between flame and turbulence, are emphatically analyzed. It is found that the faster light-round time and more wrinkles on the flame surface of calculations by LES compared with URANS. The interactions between flame and turbulence reveal that the moving speed of flame front in the early stage is fast, which is accelerated due to the thermal expansion of burnt gas. When two fronts are close to merge, the reverse flow generated in the burned area decreases the moving speed of flame front. Overall, compared with the previous URANS results, the present numerical calculations of the ignition process by LES show better agreement with experimental results.
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