Separated core turbofan engine

摘要

A low-noise separated core engine type turbofan engine is provided in which noise generated by a control propulsion device is reduced by using high pressure air as the working fluid of a turbine for driving a control fan used in the attitude control of the airframe. A control fan (17) of a separated core engine type turbofan engine (1), which is comprised in a control propulsion device (4) provided for attitude control of the aircraft, is driven by an air turbine (19) which uses as working fluid high pressure air compressed by a compressor (6) of the core engine (2) and supplied through a duct (10). The speed of the working fluid which is discharged from the control fan (17) and air turbine (19) is sufficiently low for attitude control and not as high as the speed of the working fluid which is discharged from a propulsion device (3) which is provided for thrust, and thus noise generated by the control propulsion device (4) can be reduced.