The three dimensional Reynolds-averaged Navier-Stokes (N-S) equations

renormalization group (RNG) k-ε turbulent model and standard wall functions were adopted to numerically simulate the cold flow field of annular central bluff-body trapped vortex combustor under trapped vortex cavity with/without injection. The effects of trapped vortex cavity with/without injection on the vortex structure

flow parameters in the trapped vortex cavity and the overall performance of the annular central bluff-body trapped vortex combustor were analyzed. Results show that a relatively stable double vortex structure can be formed in the trapped vortex cavity with trapped vortex cavity injection compared to trapped vortex cavity without injection. With the existence of trapped vortex cavity injection

the total pressure loss coefficient of the annular central bluff-body trapped vortex combustor is reduced about 9.2% at the exit section and the average flow parameters of the trapped vortex cavity also increase. The trapped vortex cavity injection has little influence on changing trend of flow parameters along flow-path height direction at the exit section of the annular central bluff-body trapped vortex combustor.