| 摘要 |
A method of improving the ignition performance of an after-burner device for a bypass turbojet, the after-burner device receiving a "hot" central primary flow coming from the turbine of the turbojet, and a "cold" peripheral secondary flow, and having an after-burner ignition zone situated in the secondary flow reaching the after-burner device, wherein a fraction of the primary flow is taken and brought locally into the after-burner ignition zone in order to raise the temperature in this zone to a value that is higher than the temperature of the secondary flow so as to encourage after-burner ignition. An after-burner device for a bypass turbojet having an after-burner channel disposed downstream from the turbojet in such a manner as to receive a "hot" central primary flow and a "cold" peripheral secondary flow coming from the turbojet on opposite sides of a confluence wall, fuel injector means, flame catcher members, and an ignitor member situated in an after-burner ignition zone in the secondary flow reaching the after-burner device, wherein at least one feed duct is provided to bring a fraction of the primary flow into the ignition zone. |
