Air traffic increases and growing concerns about the environment raised interests in the study of ways to reduce pollutants emissions. One reason for combustor and downstream components damage is non-uniform distribution of fuel due to dirtiness or injector damage, increasing NOx and CO emissions due to higher and lower temperature zones. Hot spots also reduce components live. Fuel injection angle change with injector life and combustion behaviors also change with this parameter. Present work report CFD simulations of combustion in the combustion chamber of a CMF56-3 gas turbine engine, to evaluate influence of injection angle on pollutant emissions and combustion temperature. Concerning engine power setup, International Civil Aviation Organization Landing and Take-Off cycle (100%, 85%, 30% and 7% engine power) were used. From the studied injection angles, lowest temperature is for 58° and that angle also produced the lowest NOx for power setups lower than 85%. 70° produced higher NOx emissions. For CO, 58° had higher emissions and 70° lower. CO2 reduces for lower injection angles, opposite to UHC. Lower angles had better results, having 3% reduction in NOx with a reduction of 10° of the injection angle. Temperature also reduces 4% with a 10° injection angle reduction.

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