The Reynolds averaged Navier-Stokes (RANS) method was used to simulate the steady flow process in rich-burn/quench/lean-burn（RQL）combustors of different quenching structures. The flow field structure of different cross sections was analyzed to study the effects of momentum flux ratio and quenching hole arrangement. Results showed that the jet deflected after entering the RQL combustor and the deflection direction was related to the swirling direction. The recirculation zone length

jet depth and high kinetic energy zone increased with the increase of the momentum flux ratio. When J≥80

a high kinetic energy zone appeared downstream the quenching jet

and gradually merged with the upstream. When J≥120

the length of the recirculation zone was substantially no longer changed. In addition

the non-central opposed jet structure C3 had a larger turbulent kinetic energy zone with better mixing.