Numerical Simulation On Influence Of Inlet Structure Of Gas Turbine Burner In Swirling Premixed Combustion

Gas turbine power generation as an efficient and clean form of power generation has great prospects for development in the future.The combustion chamber is one of the three major components of a gas turbine.The optimal design of the combustion chamber is very important for improving the combustion efficiency and reducing the pollutant discharge.In this thesis,numerical simulation is studied on the influence of swirler channel width and outlet angle of pre-mixing section in swirling premixed combustion.The conclusions will be references for the optimization design and retrofit of gas turbine dry low-emission combustion chamber.The main work of this thesis is as follows:First,Gambit was used to geometric modeling and meshing of the burners.The Fluent calculation model was built with the reference condition.The numerical simulation results on the reference condition were compared with the experimental results.It is proved that the numerical calculation model is effective.Secondly,the effect of swirler channel width on swirling premixed combustion was studied by setting different working conditions.The velocity field,temperature field,flame shape,shape of recirculation zone,NOx formation rate and emission concentration under different operating conditions were analyzed.The streamlines were used to characterize the shape of the reflow zone and to explain the coupling between the velocity field and the temperature field.Finally,the influence of pre-mixing section divergence angle on swirling premixed combustion was studied.The effect of outlet angle of premixed section on velocity field,temperature field,flame shape,shape of recirculation zone,NOx formation rate and emission concentration in the combustion chamber were explored.The change trend of temperature field in different working conditions is explained from the relative position of flame and recirculation zone.The factors affecting the rate of NOx formation in the combustion chamber were analyzed.The results can be references for reducing the nitrogen oxides emissions of the burner.