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 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 (117). A tap (110) taps air from at least one of the more upstream locations in the compressor section, passes the tapped air through a heat exchanger (112) and then to a cooling compressor. The cooling compressor compresses air downstream of the heat exchanger (112), and delivers air into the high pressure turbine. A core housing (150) has an outer peripheral surface and a fan housing (154) defining an inner peripheral surface. At least one bifurcation duct (158, 160) extends between the outer peripheral surface to the inner peripheral surface. The heat exchanger (112) is received within the at least one bifurcation duct (158, 160).
Abstract:
A gas turbine engine (20) has a core engine (36) and a fan (42). A pivoting D-door structure includes a pivoting inner D-door portion (72) and a pivoting outer D-door portion (74), which is axially moveable relative to the inner D-door portion (72) between a stowed and thrust reverse position. A fan case (70) surrounds the fan (42). Cascades (76) are axially moveable along with the outer D-door portion (74) between a stowed and a thrust reverse position. Structure supporting the cascades (76) is mounted on the fan case (70).
Abstract:
A gas turbine engine (20) includes a main engine compressor section (24). A booster compressor (72) changes a pressure of airflow received from the main engine compressor section (24) to a pressure desired for a pneumatic system (64). The booster compressor (72) is configured to operate at airflow conditions greater than a demand of the pneumatic system (64). An exhaust valve (82) controls airflow between an exhaust outlet (88) and an outlet passage (80) to the pneumatic system (64). The exhaust valve (82) is operable to exhaust airflow from the booster compressor (72) in excess of the demand of the pneumatic system (64). A bleed air system (62) for a gas turbine engine (20) and a method of controlling engine bleed airflow are also disclosed.
Abstract:
A gas turbine engine (20) includes a main engine compressor section (24). A booster compressor (70) changing a pressure of airflow received from the main engine compressor section (24) to a pressure desired for a pneumatic system (64). The booster compressor (70) operates at airflow conditions greater than a demand by the pneumatic system (64). A speed change system (84) drives the booster compressor (70) at speeds corresponding to a demand of the pneumatic system (64). A bleed air system (62) for a gas turbine engine (20) and a method of controlling engine bleed airflow are also disclosed.
Abstract:
A gas turbine engine (12) comprises a main compressor section having a high pressure compressor (141) with a downstream most end, and more upstream locations. A turbine section has a high pressure turbine (144). A first tap taps (126) air from at least one of the more upstream locations in the main compressor section, passing the tapped air through a first heat exchanger (122) and then to a cooling compressor (124). A second tap (140) taps air from a location closer to the downstream most end than the location of the first tap, and the first and second taps mix together and are delivered into the high pressure turbine (144). The cooling compressor (124) is positioned downstream of the first heat exchanger (122), and upstream of a location where air from the first and second taps mix together.
Abstract:
A thermal management system (100) for a gas turbine engine includes a heat exchanger (102), an oil circuit (108), and a coolant circuit (110). The oil circuit (108) is in fluid communication with the heat exchanger (102). The coolant circuit (110) is in fluid communication with the heat exchanger (102) and in thermal communication with the oil circuit (108) through the heat exchanger (102) to return heat from the oil circuit (108) to a core flow path of a gas turbine engine (10) using a thermally neutral heat transfer fluid (TN HTF).
Abstract:
A gas turbine engine includes a compressor section having a plurality of compressor stages, a combustor, a turbine section having at least one stage, a compressor bleed structure disposed in one of the compressor stages to remove air therefrom, a heat exchanger having an input connected to the compressor bleed, and an output connected to an active cooling system of at least one turbine stage. The compressor stage in which the compressor bleed structure is disposed includes airflow at a pressure above a minimum pressure threshold and at a temperature above a maximum temperature threshold.
Abstract:
A seal segment (102) for a gas turbine engine (20) includes a first axial span (134) that extends between a first radial span (130) and a second radial span (132). A second axial span (136) extends between the first radial span (130) and the second radial span (132), the first radial span (130), the second radial span (132), the first axial span (134) and the second axial span (136) form a torque box. A plurality of seal segments (102) may be located between first and second rotor disks (68, 70).
Abstract:
A gas turbine engine includes a turbine section (54) fluidly connected to a combustor (56) by a primary flow path (C). The turbine section (54) includes a first portion at a high pressure relative to a second portion. A thermally isolated cooling plenum (180) is positioned radially inward of the primary flow path (C). The cooling plenum (180) is defined by a forward wall (150), a shaft structure (170), an aft wall (160), and an inner diameter wall of the primary flow path (C). Air in the thermally isolated cooling plenum (180) is thermally isolated from air in the primary flow path (C). At least one cooling air system is operable to provide cooling air to the thermally isolated cooling plenum (180).