The effects of different atomization performance caused by nozzle damage on the annular backflow combustor performance were studied by using Fluent software. Three-dimensional two-phase spray combustion flow fields in a model annular backflow combustor were numerically simulated using realizable k-ε model

DPM (discrete phase model) with UDF(user defined function) subroutines tracking fuel trajectory

n-heptane as surrogate fuel and laminar flamelet model. The results reveal that the numerical method is reasonable to predict combustion flow of annular backflow combustor. The outlet temperature non-uniformity deterirated with the atomization performances change caused by nozzle damage. And the combustion efficiency also decreased.When the fuel flow rate was reduced by 19%

the performance of the combustor was not conformity with the operational requirements.