Talking the central staged swirl combustor as the research object

the influence of different fuel classification ratios on the flow field characteristics and combustion characteristics of the combustor under the same total equivalence ratio was studied by means of experimental research and numerical simulation. The non-reacting flow field structure of the combustion chamber was obtained by PIV

the temperature distribution of the combustion chamber outlet was obtained by thermocouple

and the spatial temperature distribution and pulsation of the combustion chamber were obtained by tunable diode laser absorption spectroscopy (TDLAS). The results show that the fuel stratification ratio has a great influence on the flow field characteristics and combustion characteristics of the combustion chamber. The lower the fuel stratification ratio

the flatter the radial temperature distribution at the outlet of the combustor. With the increase of pilot fuel

the axial velocity of pilot stage increases

and the central temperature becomes higher. When the diffusion combustion only provides fuel for the pilot stage

the mixing in the combustion chamber is poor and the temperature fluctuation is large. When the main stage and pilot stage provide fuel at the same time

the temperature fluctuation in the combustion chamber will be significantly reduced. The outlet temperature distribution coefficient

CO and NO emissions gradually increase with the increasing fuel stratification ratio.