TY - JOUR
TI - Numerical study of flame/vortex interactions in 2-D Trapped Vortex Combustor
AU - Mishra Debi Prasad
AU - Sudharshan Renganathan
AU - Ezhil Kumar Perumal Kumaresan
JN - Thermal Science
PY - 2014
VL - 18
IS - 4
SP - 1373
EP - 1387
PT - Article
AB - The interactions between flame and vortex in a 2-D Trapped Vortex Combustor  are investigated by simulating the Reynolds Averaged Navier Stokes (RANS)  equations, for the following five cases namely (i) non-reacting (base) case,  (ii) post-vortex ignition without premixing, (iii) post-vortex ignition with  premixing, (iv) pre-vortex ignition without premixing and (v) pre-vortex  ignition with premixing. For the post-vortex ignition without premixing  case, the reactants are mixed well in the cavity resulting in a stable ‘C’  shaped flame along the vortex edge. Further, there is insignificant change  in the vorticity due to chemical reactions. In contrast, for the pre-vortex  ignition case (no premixing); the flame gets stabilized at the interface of  two counter rotating vortices resulting in reduced reaction rates. There is  a noticeable change in the location and size of the primary vortex as  compared to case (ii). When the mainstream air is premixed with fuel, there  is a further reduction in the reaction rates and thus structure of cavity  flame gets altered significantly for case (v). Pilot flame established for  cases (ii) and (iii) are well shielded from main flow and hence the flame  structure and reaction rates do not change appreciably. Hence, it is  expected that cases (ii) and (iii) can perform well over a wide range of  operating conditions.