Abstract:
A gas turbine engine (80) comprises a compressor section (82) and a turbine section (93), with the turbine section having a first stage blade row (91) and a downstream blade row (110). A higher pressure tap (86) is tapped from a higher pressure first location in the compressor (82). A lower pressure tap (88) is tapped from a lower pressure location in the compressor (82) which is at a lower pressure than the first location. The higher pressure tap (86) passes through a heat exchanger (84), and then is delivered to cool the first stage blade row (91) in the turbine section (93). The lower pressure tap (84) is delivered to at least partially cool the downstream blade row (110).
Abstract:
A turbine section (28) of a gas turbine engine (20) includes a fan drive turbine section (46), and a second turbine section (54). The fan drive turbine section (46) has a first exit area (401) at a first exit point and is configured to rotate at a first speed. The second turbine section (54) has a second exit area at a second exit point (400) and is configured to rotate at a second speed, which is faster than the first speed.
Abstract:
A gas turbine engine comprises a main compressor section (24) having a high pressure compressor with a downstream discharge, and more upstream locations. A turbine section (28) has a high pressure turbine (117). A tap (110) taps air from at least one of the more upstream locations in the compressor section, passing the tapped air through a heat exchanger (112) and then to a cooling compressor (114), which compresses air downstream of the heat exchanger (112), and delivers air into the high pressure turbine (117). The cooling compressor (114) rotates at a speed proportional to a speed of at least one rotor in the turbine section (28). The cooling compressor (114) is allowed to rotate at a speed that is not proportional to a speed of the at least one rotor under certain conditions. An intercooling system for a gas turbine engine is also disclosed.
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 (117). The cooling compressor includes a downstream connection that delivers discharge pressure air to an upstream location in the high pressure turbine and a second tap (160) from an intermediate pressure location within the cooling compressor. The second tap (160) is connected to a downstream location within the high pressure turbine (117). An intercooling system for a gas turbine engine is also disclosed.
Abstract:
A gas turbine engine (20) according to an exemplary aspect of the present disclosure includes, among other things, a first compressor (44) having a first overall pressure ratio, and a second compressor (52) having a second overall pressure ratio. A ratio of the first overall pressure ratio to the second overall pressure ratio is greater than or equal to about 2.0. Further, a section of the gas turbine engine includes a thermally isolated area (78).
Abstract:
A gas turbine engine (20) includes a turbine section (54) that includes a turbine rotor (132) arranged in a plenum (180). A compressor section (54) includes a compressor rotor assembly (60) that has spaced apart inner and outer portions (71, 73) that provide an axially extending cooling channel (84). Compressor blades (78) extend radially outward from the outer portion (73) which provides an inner core flow path (C). A rotor spoke is configured to receive a first cooling flow (76) and fluidly connect the outer portion (73) to the cooling channel (84). The compressor rotor assembly (60) has a coolant exit (90) that is in fluid communication with the cooling channel (84). The compressor rotor assembly (60) is configured to communicate the first cooling flow (76) to the turbine rotor (132). A bleed source (91) is configured to provide a second cooling flow (190). A combustor section (56) includes an injector (120) in fluid communication with the bleed source (91). The tangential onboard injector (120) is configured to communicate the second cooling flow (190) to the turbine rotor (132).
Abstract:
A gas turbine engine includes a core housing that includes an inlet case and an intermediate case that respectively provide an inlet case flow path and an intermediate case flow path. A geared architecture is arranged within the inlet case. A shaft provides a rotational axis. A hub is operatively supported by the shaft. A rotor is connected to the hub and supports a compressor section. The compressor section is arranged axially between the inlet case flow path and the intermediate case flow path. A bearing is mounted to the hub and supports the shaft relative to one of the intermediate case and the inlet case.
Abstract:
A rotor assembly of a gas turbine engine 20 may be spoked and includes a rotor 58 and a shell 110. The rotor 58 has a rotor disk 64 and a plurality of blades 62 each having a platform 74 attached to the rotor disk 64 and with a first channel 80 defined radially between the platforms 74 and the rotor disk 64. The shell 110 projects aft of the rotor 58 and includes inner and outer walls 112,114 with a passage 116 defined therebetween. The passage 116 is in fluid communication with the first channel 80 and, together, form part of a secondary flowpath S for cooling of adjacent components. The rotor assembly may further include a structure 118 located radially inward of the rotor disk 64 and shell 110. The structure 118 defines a supply conduit 126 for flowing air from the passage 80 and into a rotor bore 122 defined at least in part by adjacent rotor disks 58. The entering air, being pre-heated when flowing through the channel 80 and passage 116, warms the bore 122 and reduces thermal gradients, thus thermal fatigue, across the rotor disk 58.
Abstract:
A mounting system for a gas turbine engine includes a low pressure turbine section, a first bearing, a mid-turbine frame, and a rear mount. The first bearing supports at least a portion of the low pressure turbine section. The mid-turbine frame supports the first bearing. The rear mount is connected to the mid-turbine frame and is configured to react loads from the gas turbine engine.
Abstract:
A gas turbine engine includes a fan section, a gear arrangement configured to drive the fan section, a compressor section and a turbine section. The compressor section includes a low pressure compressor section and a high pressure compressor section. The turbine section is configured to drive compressor section and the gear arrangement. An overall pressure ratio, which is provided by a combination of a pressure ratio across said low pressure compressor section and a pressure ratio across said high pressure compressor section, is greater than about 35. The pressure ratio across the low pressure compressor section is between about 3 and about 8 whereas the pressure ratio across the high pressure compressor section is between about 7 and about 15.