Gas turbine engine
A gas turbine engine is provided having a turbomachine comprising a compressor section, a combustion section, and a turbine section arranged in serial flow order, the compressor section having a high pressure compressor defining a high pressure compressor exit area (A HPCExit ) in square inches and the turbine section having a drive turbine defining a drive turbine exit area (A DTExit ) in square inches, the turbomachine further comprising a drive turbine shaft coupled to the drive turbine; wherein the gas turbine engine defines a maximum exhaust gas temperature (EGT) in degrees Celsius, a maximum drive turbine shaft torque (T OUT ) in Newton meters, and a corrected specific power (CSP) in Newtons squared times degrees Celsius over meters squared, wherein the corrected specific power is determined as follows: ( T O U T A D T E x i t ) 2 * E G T A H P C E x i t * 1 0 - 1 1 ; wherein CSP is greater than 0.0001194×EGT 2 −0.103×EGT+22.14 and less than 0.0003294×EGT 2 −0.306×EGT+77.91; and wherein EGT is greater than 525 degrees Celsius and less than 1250 degrees Celsius.
1. A gas turbine engine comprising:
a turbomachine comprising a compressor section, a combustion section, and a turbine section arranged in serial flow order, the compressor section having a high pressure compressor defining a high pressure compressor exit area (A HPCExit ) in square inches and the turbine section having a drive turbine defining a drive turbine exit area (A DTExit ) in square inches, the turbomachine further comprising a drive turbine shaft coupled to the drive turbine;
wherein the gas turbine engine defines a maximum exhaust gas temperature (EGT) in degrees Celsius, a maximum drive turbine shaft torque (T OUT ) in Newton meters, and a corrected specific power (CSP) in Newtons squared times degrees Celsius over meters squared, wherein the corrected specific power is determined as follows:
(
T
O
U
T
A
D
T
E
x
i
t
)
2
*
E
G
T
A
H
P
C
E
x
i
t
*
1
0
-
1
1
;
wherein CSP is greater than 0.0001194×EGT 2 −0.103×EGT+22.14 and less than 0.0003294×EGT 2 −0.306×EGT+77.91; and
wherein EGT is greater than 525 degrees Celsius and less than 1250 degrees Celsius.
2. The gas turbine engine of claim 1 , wherein CSP is less than 210 and greater than 1.
3. The gas turbine engine of claim 1 , wherein the EGT is greater than 750 degree Celsius and less than 1100 degrees Celsius, and wherein CSP is less than 140 and greater than 12.1.
4. The gas turbine engine of claim 1 , wherein the T OUT is greater than 530 Newton-meters and less than 4740 Newton-meters.
5. The gas turbine engine of claim 1 , further comprising:
an intercooler assembly comprising a heat exchanger, the heat exchanger in thermal communication with the compressor section.
6. The gas turbine engine of claim 5 , wherein the compressor section defines in part a working gas flowpath through the turbomachine, and wherein the heat exchanger is in direct thermal communication with the working gas flowpath through the compressor section.
7. The gas turbine engine of claim 5 , wherein the compressor section defines in part a working gas flowpath through the turbomachine, wherein the compressor section comprises a first compressor and a second compressor, and wherein the heat exchanger is in thermal communication with the working gas flowpath through the compressor section at a location between the first compressor and the second compressor.
8. The gas turbine engine of claim 5 , wherein the compressor section defines in part a working gas flowpath through the turbomachine, wherein the compressor section comprises a compressor defining an upstream end and a downstream end, and wherein the heat exchanger is in thermal communication with the working gas flowpath through the compressor at a location between the upstream end and the downstream end of the compressor.
9. The gas turbine engine of claim 5 , wherein the heat exchanger is located externally of the turbomachine.
10. The gas turbine engine of claim 5 , further comprising a fuel system configured as a liquid hydrogen fuel system, and wherein the heat exchanger is in thermal communication with the liquid hydrogen fuel system.
11. The gas turbine engine of claim 1 , wherein the compressor section comprises a first compressor, and wherein the first compressor is configured as an axial compressor, a centrifugal compressor, or an axial-centrifugal compressor.
12. The gas turbine engine of claim 11 , wherein the compressor section further comprises a second compressor, and wherein the second compressor is configured as an axial compressor, a centrifugal compressor, or an axial-centrifugal compressor.
13. The gas turbine engine of claim 1 , wherein the turbine section comprises a high pressure turbine having a first stage of high pressure turbine rotor blades, and wherein the gas turbine engine further comprises:
a cooled cooling air system in fluid communication with the first stage of high pressure turbine rotor blades.
14. The gas turbine engine of claim 13 , wherein the cooled cooling air system is further in fluid communication with the high pressure compressor for receiving an airflow from the high pressure compressor, and wherein the cooled cooling air system further comprises a heat exchanger in thermal communication with the airflow for cooling the airflow.
15. The gas turbine engine of claim 13 , wherein when the gas turbine engine is operated at a takeoff power level, the cooled cooling air system is configured to provide a temperature reduction of a cooling airflow equal to at least 15% of the EGT and up to 45% of the EGT.
16. The gas turbine engine of claim 13 , wherein when the gas turbine engine is operated at a takeoff power level, the cooled cooling air system is configured to receive between 2.5% and 35% of an airflow through a working gas flowpath of the turbomachine at an inlet to a compressor of the compressor section.
17. The gas turbine engine of claim 1 , wherein the gas turbine engine is a turboprop engine further comprising:
a propeller assembly, wherein the propeller assembly comprises a propeller driven by the drive turbine shaft.
18. The gas turbine engine of claim 1 , further comprising:
a power gearbox, wherein the drive turbine shaft is driven by the turbomachine across the power gearbox.
19. The gas turbine engine of claim 1 , wherein the gas turbine engine is a turboshaft engine.
20. A gas turbine engine comprising:
a turbomachine comprising a compressor section, a combustion section, and a turbine section arranged in serial flow order, the compressor section having a high pressure compressor defining a high pressure compressor exit area (A HPCExit ) in square inches and the turbine section having a drive turbine defining a drive turbine exit area (A DTExit ) in square inches, the turbomachine further comprising a drive turbine shaft coupled to the drive turbine and defining an overall pressure ratio greater than 14:1 and less than or equal to 22:1; and
wherein the gas turbine engine defines a maximum exhaust gas temperature (EGT) greater than 600 degrees Celsius and less than 1000 degrees Celsius, an output power of at least 550 horsepower and up to 2,000 horsepower when operated at a rated speed, a maximum drive turbine shaft torque (T OUT ) in Newton meters, and a corrected specific power (CSP) in Newtons squared times degrees Celsius over meters squared, wherein CSP is greater than 3.3 and less than 101 and is determined as follows:
(
T
O
U
T
A
D
T
E
x
i
t
)
2
*
E
G
T
A
H
P
C
E
x
i
t
*
1
0
-
1
1
.
21. The gas turbine engine of claim 20 , wherein the turbomachine defines an overall pressure ratio greater than 15:1 and less than or equal to 20:1.
22. The gas turbine engine of claim 20 , wherein the turbomachine comprises a stage of variable inlet guide vanes upstream of the compressor section and a stage of variable stator vanes within the compressor section.
23. The gas turbine engine of claim 20 , wherein the turbine section further comprises a high pressure turbine having a first stage of high pressure turbine rotor blades and a second stage of high pressure turbine rotor blades, wherein the first and second stages of high pressure turbine rotor blades each include air cooled high pressure turbine rotor blades.
24. The gas turbine engine of claim 20 , wherein the drive turbine is a low pressure turbine comprising three stages of low pressure turbine rotor blades.
25. The gas turbine engine of claim 20 , wherein the compressor section includes an airflow of less than 10.5 pounds per second therethrough when the gas turbine engine is operated at a takeoff power level.
26. The gas turbine engine of claim 20 , wherein the gas turbine engine defines a maximum exhaust gas temperature (EGT) greater than 700 degrees Celsius and less than 900 degrees Celsius, and wherein CSP is greater than or equal to 4 and less than or equal to 69.
27. A method of operating a gas turbine engine, comprising:
operating the gas turbine engine at a takeoff power level, wherein operating the gas turbine engine at the takeoff power level comprises driving a propeller of a propeller assembly across a propeller shaft of the propeller assembly, the gas turbine engine further comprising a turbomachine with a high pressure compressor defining a high pressure compressor exit area (A HPCExit ) in square inches and a drive turbine defining a drive turbine exit area (A DTExit ) in square inches, the gas turbine engine defining a maximum exhaust gas temperature (EGT) in degrees Celsius, a maximum drive turbine shaft torque (T OUT ) in Newton meters, and a corrected specific power in Newtons squared times degrees Celsius over meters squared;
wherein the corrected specific power (CSP) is determined as follows:
(
T
O
U
T
A
D
T
E
x
i
t
)
2
*
E
G
T
A
H
P
C
E
x
i
t
*
1
0
-
1
1
;
wherein CSP is greater than 0.0001194×EGT 2 −0.103×EGT+22.14 and less than 0.0003294×EGT 2 −0.3061×EGT+77.91; and
wherein EGT is greater than 525 degrees Celsius and less than 1250 degrees Celsius.