关键词: 燃烧室；主燃区；回流区；反向旋流；同向旋流；主燃射流；粒子成像测速仪(PIV)

Abstract: For a single-dome annular combustor rectangular model with dual-swirler，including discrete jets and radial swirler，the velocity field in primary zone was measured with Particle Image Velocimetry(PIV) in isothermal condition with 300K. The isothermal and reacting flowfield of combustor were simulated with Realizable κ-? turbulent model and Steady Laminar Flamelet combustion model，obtaining distribution of velocity and flowfield structure，which are compared with the experiment results. The results indicate that instantaneous flowfield changes rapidly. A large number of small-scale vortex are formed along the boundary of swirl flow and primary jet illustrating the strongly stirring effect of recirculation zone，and instantaneous rear stagnation point is random. The size of recirculation zone generated by counter-swirler is smaller than that generated by co-swirler，and the size of recirculation zone in reacting condition is smaller than that in isothermal condition. However，the size of recirculation zone is primarily controlled by liner and primary jet. The outer swirl flow can control the inner swirl flow in 5mm from the exit of the dome，keeping the same direction as outer swirl flow. Combustion can increase the penetration depth of primary jet and change the symmetry property of flowfield.

Key words: Combustor；Primary zone；Recirculation zone；Counter-swirl；Co-swirl；Primary jet；Particle image velocimety(PIV)