Taking a heavy-duty gas turbine combustion chamber as the research object

the three-dimensional numerical simulation model of the combustor was established

which was used to study the influence of combustion pressure on the NO_x formation in chamber.The combustion flow field and NO_x emission characteristics of premixed combustion was solved by using the realizable k-ε turbulence model and the finite-rate/eddy-dissipation turbulent combustion mode.Moreover

the thermal and prompt type NO_x emissions were considered in the NO_x formation model.The results show that

from the head to the end of the combustion chamber

the average mass fraction of NO_x gradually increases.In the range of working pressure of the gas turbine combustion chamber

both the average mass fraction of NO_x at the combustor outlet and the peak mass fraction of NO_x formation increase with the chamber pressure.The research can provide basis for combustion adjustment and NO_x emission reduction for gas turbines.