A proper shock train generated by air throttling could facilitate ignition.The effects of air throttling on ignition transient were studied by solving unsteady Navier-Stokes equations

and the mechanism of air throttling for ignition was also analyzed during the ignition transient (0— 1.0ms ).Computational fluid dynamics results show that:under the inflow air conditions of Mach number 2.0

static temperature 548.8K

static pressure 101555.9Pa and the equivalence ratio 0.5

the pilot H2 is used for ignition

the location of air throttling is 845mm from the combustor entrance

and the flux of air throttling is 30% mass flux of inflow air. Ignition is achieved by air throttling

and flame goes out without air throttling at last.