AFTERBURNER AND AIRCRAFT ENGINE

摘要

The present embodiment improves the durability of an afterburner and yet suppresses a reduction in the engine efficiency of an aircraft engine. A ring-shaped cooling channel through which cooling air flows is formed between the outer peripheral surface of a liner and the inner peripheral surface of a rear duct. A plurality of cooling holes for blowing the cooling air along the inner peripheral surface of the liner are formed penetrating the liner. A ring-shaped annulus flame-holding member on the inner peripheral surface of the liner is provided concentrically with respect to a plurality of radial flame-holding members. The inner diameter of the annulus flame-holding member decreases in the downstream direction. The annulus flame-holding member functions as a throttle ring which throttles the flowing of a main flow of a mixed gas inside the liner.

主权项

1. An afterburner which supplies fuel to a gas mixture of combustion gas discharged from a core flow path of an aircraft engine and air discharged from a fan flow path of the aircraft engine for burning to increase thrust of the aircraft engine, the afterburner comprising:
a rear duct provided in the outlet side of an engine case of the aircraft engine; a cylindrical liner which is provided within the rear duct and allows the gas mixture to flow, a fuel injector which injects the fuel in the form of liquid in the liner; an igniter which is provided downstream of the fuel injector and ignites the gas mixture containing the fuel in the liner; a flame holder which is situated downstream of the fuel injector and is configured to hold flame, the flame holder including a plurality of radial flame holding members which are situated in a radial fashion inside the liner and propagate flame in the radial direction; and a throttle ring which is provided at a position aligned with the radial flame holding members on the inner circumferential surface of the liner and is configured to throttle the main flow of the gas mixture, wherein between the outer circumferential surface of the liner and the inner circumferential surface of the rear duct, an annular cooling path is formed, through which a part of the air discharged from the fan flow path flows as cooling air, and the liner includes a plurality of penetrating cooling holes to blow out the cooling air along the inner circumferential surface of the liner.