초록 ▼

Methods and apparatus for improving the thrust specific fuel consumption (TSFC) of a gas turbine engine employing an exterior active clearance control system are disclosed. The pressure within the nacelle compartment to which active clearance control air is discharged is operated under altitude crui

Methods and apparatus for improving the thrust specific fuel consumption (TSFC) of a gas turbine engine employing an exterior active clearance control system are disclosed. The pressure within the nacelle compartment to which active clearance control air is discharged is operated under altitude cruise conditions at a level on the order of one to two and one-half pounds per square inch (1-2½psi) above the ambient atmosphere. Flow discharging from the nacelle is directed through an aft facing vent nozzle for purposes of thrust recovery.

대표청구항 ▼

A method of operating an aircraft power plant installed on an aircraft and of the active clearance controlled type including a gas turbine engine housed within a nacelle compartment and a cooling air manifold extending around the engine including the steps of: admitting active clearance control cool

A method of operating an aircraft power plant installed on an aircraft and of the active clearance controlled type including a gas turbine engine housed within a nacelle compartment and a cooling air manifold extending around the engine including the steps of: admitting active clearance control cooling air into said nacelle compartment and discharging the air against the engine; maintaining the air pressure within said nacelle compartment at altitude cruise conditions at a level which is on the order of one to two and one-half pounds per square inch (1-2½psi) above the pressure of the air externally of the power plant; discharging air from said compartment in an aft direction relative to the aircraft on which the power plant is installed.