By-pass engine with variation of its throat section by means of air injection

摘要

The engine (10) has inlet orifices (44) for drawing air in an annular channel (38) flowing of secondary air in upstream of a throat section (42) of a tailpipe (40). An annular opening injects the air drawn in downstream of the section of the tail pipe so as to artificially open the section. An external air inlet (62) draws and compresses the air external to the engine. Air injectors (66) inject the air drawn at vicinity of the section along a perpendicular direction opposed to the air flow so as to close the section by aerodynamic obstruction of the flow of air crossing the section. An independent claim is also included for a method for varying a throat section of a tailpipe at a fixed section of a turbo fan engine.