Abstract:
A gas turbine engine (20) includes a main compressor section (24). A booster compressor (72) includes an inlet (74) and an outlet (76). The inlet (74) receives airflow from the main compressor section (24) and the outlet (76) provides airflow to a pneumatic system (64). A recirculation passage (78) is between the inlet (74) and the outlet (76). A flow splitter valve (80) controls airflow between the outlet (76) and the inlet (74) through the recirculation passage (78) for controlling airflow to the pneumatic system (64) based on airflow output from the booster compressor (72). A bleed air system (100) for a gas turbine engine (20) and a method of controlling engine bleed airflow are also disclosed.
Abstract:
A gas turbine engine compressor stage includes a rotor (70). Compressor blades (71) are supported by the rotor (70). The blades (71) include an inner flow path surface each supporting an airfoil that has a chord (80) that extends radially along a span (78) to a tip. A shroud (82) is supported at the tip and provides an outer flow path surface. The shroud (82) provides a noncontiguous ring about the compressor stage.
Abstract:
A variable vane system includes an actuator, a harmonic drive, a unison ring (306) and a multiple of variable vanes. The harmonic drive is driven by the actuator. The unison ring (306) is driven by the harmonic drive and includes a multiple of pins (304). The multiple of variable vanes is driven by the unison ring (306) and each of the vanes is connected to the unison ring (306) through a drive arm (300) including a slot which receives one of the pins (304) to accommodate axial motion of the unison ring (306).
Abstract:
An actuator system (118E) including a harmonic drive (122) operable to drive a variable vane system (100) of a gas turbine engine (20). A multi-planar drive gear set (200) is driven by the harmonic drive (122) and drives first and second actuator gears (210,214) of first and second variable vane stages (212,216).
Abstract:
A gas turbine engine (10) has a nose cone (80), a fan for delivering air into a bypass duct as bypass flow, and into a core engine to be delivered to a compressor. The nose cone (80) includes a vent (84) to receive air and deliver the air across a heat exchanger (86), which receives a fluid to be cooled. The air from the vent (84) is delivered to an outlet (104) downstream of the heat exchanger (86), such that a majority of the air being delivered to the outlet (104) becomes part of the bypass flow.
Abstract:
A gas turbine engine comprises a main compressor section having a high pressure compressor with a downstream discharge, and more upstream locations. A turbine section has a high pressure turbine. A tap taps air from at least one of the more upstream locations in the compressor section, passing the tapped air through a heat exchanger and then to a cooling compressor. The cooling compressor compresses air downstream of the heat exchanger, and delivers air into the high pressure turbine. The heat exchanger also receives air to be delivered to an aircraft cabin. An intercooling system for a gas turbine engine is also disclosed.
Abstract:
A compressor intermediate case for a gas turbine engine includes a plurality of intermediate case struts joining the compressor intermediate case to an inner engine structure. Each strut of the plurality of intermediate case struts includes a leading edge. A turning scoop is disposed at the leading edge of each strut of the plurality of intermediate case struts. A plurality of diffusers extends radially outwardly from the compressor intermediate case so that each diffuser of the plurality of diffusers engages with a corresponding turning scoop. A substantially annular structural fire wall extends radially outwardly from the compressor intermediate case. An environmental control system manifold is disposed on the compressor intermediate case. The environmental control system manifold includes an exit port.
Abstract:
A compressor section (24) of a gas turbine engine (20) includes a bleed port (201) having a flow splitter (210) therein so as to define a downstream bleed channel (207) having a downstream inlet (205) and an upstream bleed channel (203) having an upstream inlet (271) that is positioned radially outward from the downstream inlet (205).
Abstract:
A thermal management system (100) and method (200) of circulating air in a gas turbine engine (20) are disclosed. The thermal management system includes a nose cone (102) having an aperture (104) communicating air to an interior space (106) of the nose cone and a fan blade (112) coupled to the nose cone and having a blade passage (114), wherein the nose cone rotates with the fan blade to circulate air from the aperture to the blade passage.