A numerical investigation was conducted to study some key parameters of multi-injection combustor

including swirl numbers

space between venturis

distance between the dome and the diffuser.The influence law of these parameters on the multi-injection combustor's recirculation zone was concluded.This shows that

with increase of the swirl number

the reverse velocity of the recirculation zone will rise.When the swirl number increases from 0.82 to 1.24

the maximal reverse velocity is 52% greater and the recirculation zone is 34% longer.When the space between venturis changes from 0 to 0.4 times the exit diameter of venture

the radii of recirculation zone is 33% bigger and the length is 43% larger.With the increasing area of inlet of the diffuser and the growing distance between the dome and the diffuser

the distribution of the flow is more uniform.