DOUBLE FLOW TURBOMACHINE WITH ARTIFICIAL VARIATION OF ITS COLLEGE SECTION

摘要

The invention relates to a turbofan engine (10) comprising a gas turbine engine (14) provided with a fan (20) disposed along a longitudinal axis (12) of the turbomachine and an annular nacelle (16) surrounding the engine to define a flow channel (38) of a cold flow, the nacelle having an upstream end surrounding the engine fan and a fixed downstream end forming a gas ejection nozzle (40), the nozzle having a neck section (42) corresponding to its minimum cross section. The turbomachine further comprises means (44) for withdrawing air in the flow channel (38) of the cold flow upstream of the neck section (42) of the nozzle, and means for injecting the air drawn downstream of the neck section of the nozzle so as to artificially open the neck section.