Investigation on the Fuel Concentration in the Concentric Staged Combustor

The concentric staged combustor has become a research hotspot in the field of aero-engine with its special way of combustion organizing in high temperature rise situation, and the swirler is one of the important components that affect the performance of the combustor. In this study, the numerical simulation method is used to calculate the fuel concentration distribution by changing the pilot swirler stage angle in the concentric staged combustor. For the distribution of fuel concentration, the results revealed that the turbulent kinetic energy of the flow field and the atomization and evaporation process of the fuel are affected by the structural change of the pilot swirler stage. The vaporization of the liquid-phase fuel and the gas-phase fuel concentration in the central recirculation zone of the combustion chamber increase with the decrease of the number of swirls, which is beneficial to the combustion of the combustion chamber when the high temperature rises. The results provide valuable insights into the fuel concentration flow characteristics in the concentric staged combustion chamber.