In order to study the mechanism of flame stabilization in cavity of advanced vortex combustor

an improvement program of after bluff-body structure was introduced

and the combustion characteristics of improved combustor under the conditions of premixed and non-premixed combustion were numerically simulated. The results show that under the condition of premixed combustion

the improved bluff-body structure can enhance the intensity and temperature of vortex flow in cavity

and make the temperature distribution more evenly no matter if equivalence ratio is 0.6 or equal to 1.0. In addition

the cavity temperature increases with the increasing premixed inlet velocity

and changes little when the velocity reaches a certain value. Under the condition of non-premixed combustion

the improved bluff-body structure ameliorates the vortex flow and temperature distribution in cavity

and the cavity maintains relatively high temperature under the condition of lean burning. The improved lightweight combustor can provide certain reference for engineering application.