Triple swirler combustor with two different dome structures was investigated. The reference type was case 1

and the dome for the installation of outer ring was case 2. Numerical simulation was conducted for the flow field and combustion field of the two combustors. The combustion efficiency

smoke emission and exit temperature distribution of the two designs were measured by gas analysis and thermocouple under the same experimental conditions. The results showed that the combustion efficiency of the triple swirler was more than 99.7%. The flow field and temperature field distributions of the combustor with an outer ring were improved compared with the reference type; besides

the recirculation zone was plumper

and the effects of fuel mixing with air and fuel atomization were increased

and the outlet temperature distribution factor (OTDF) and smoke emission decreased by 36% and 25% respectively.