Gas turbine engine
A gas turbine engine includes a turbomachine having an engine core including a high-pressure compressor, a combustion section, a high-pressure turbine, and a high-pressure shaft coupled to the high-pressure compressor and the high-pressure turbine. The engine core has a length (L CORE ), and the high-pressure compressor has an exit stage diameter (D CORE ). The high-pressure compressor defines a high-pressure compressor exit area (A HPCExit ) in square inches. The gas turbine engine defines a redline exhaust gas temperature (EGT) in degrees Celsius, a total sea level static thrust output (Fn Total ) in pounds, and a corrected specific thrust, wherein the corrected specific thrust is greater than or equal to 42 and less than or equal to 90, the corrected specific determined as follows: Fn Total ×EGT/(A HPCExit 2 ×1000). The high-pressure shaft is characterized by a high-speed shaft rating (HSR) from 1.5 to 6.2, and a ratio of L CORE /D CORE is from 2.1 to 4.3.
1 . A gas turbine engine comprising:
a turbomachine comprising a compressor section having a high-pressure compressor, a combustion section, and a turbine section having a high-pressure turbine arranged in serial flow order, the turbomachine includes an engine core including the high-pressure compressor, the combustion section, and the high-pressure turbine, the engine core having a length (L CORE ) in inches, the high-pressure compressor having an exit stage diameter (D CORE ) in inches, the high-pressure compressor defining a high-pressure compressor exit area (A HPCExit ) in square inches, and the high-pressure compressor including a high-pressure compressor flowpath and a plurality of stages of high-pressure compressor rotor blades and high-pressure compressor stator vanes, wherein the gas turbine engine defines a redline exhaust gas temperature (EGT) in degrees Celsius, a total sea level static thrust output (Fn Total ) in pounds, and a corrected specific thrust, wherein the corrected specific thrust is greater than or equal to 42 and less than or equal to 90, the corrected specific thrust determined as follows: Fn Total ×EGT/(A HPCExit 2 ×1000); and
a high-pressure shaft coupled to the high-pressure compressor and the high-pressure turbine, the high-pressure shaft characterized by a ratio of L CORE /D CORE greater than or equal to 2.1 and less than
4.08
(
HSP
x
-
8
)
0.14
,
wherein HSPx is a first high-speed shaft operating parameter given 2.1 and less than by:
HSPx
=
(
A
ex
)
2
*
P
STD
*
OPR
T
O
FN
T
O
*
(
N
Stg
10
)
2
,
where N Stg is a number of stages in the high-pressure compressor, A EX is equal to A HPCExit , P STD is standard pressure in pounds per square inch, OPR T/O is an overall pressure ratio of the gas turbine engine at takeoff flight conditions corresponding to a maximum thrust rating for an engine core configuration, and FN T/O is a sea-level static thrust in lbf of the gas turbine engine at takeoff flight conditions corresponding to the maximum thrust rating for the engine core configuration.
2 . The gas turbine engine of claim 1 , wherein the high-pressure compressor includes nine stages, ten stages, or eleven stages.
3 . The gas turbine engine of claim 1 , wherein the high-pressure turbine includes one stage or two stages.
4 . The gas turbine engine of claim 1 , wherein the exhaust gas temperature (EGT) is from 1,063° C. to 1,282° C.
5 . The gas turbine engine of claim 1 , further comprising:
a fan; and
a reduction gearbox, wherein the fan is driven by the turbomachine across the reduction gearbox, wherein the reduction gearbox comprises a gear ratio between 3.2 and 4.5.
6 . The gas turbine engine of claim 1 , wherein L CORE /D CORE is less than MAX(4.8−0.088*(HSP X ), 3.18−0.015*(HSP X )).
7 . The gas turbine engine of claim 1 , wherein HSP X is from 3.8 in 2 to 69.1 in 2 .
8 . The gas turbine engine of claim 1 , wherein A EX is from 11 in 2 to 95 in 2 .
9 . The gas turbine engine of claim 1 , wherein P STD is approximately 14.7 psi.
10 . The gas turbine engine of claim 1 , wherein OPR T/O is from 26.3 to 82.
11 . The gas turbine engine of claim 1 , wherein FN T/O is from 12,674 lbf to 107,480 lbf.
12 . The gas turbine engine of claim 1 , wherein A EX is given by:
A EX =π*(R TIP,EX 2 −R HUB,EX 2 ), where R TIP,EX is a radius in inches of a tip of a high-pressure compressor blade of the exit stage of the high-pressure compressor, and R HUB,EX is a radius in inches of a hub of the high-pressure compressor at the exit stage.
13 . The gas turbine engine of claim 12 , wherein R TIP,EX is from 4.73 in. to 15.83 in.
14 . The gas turbine engine of claim 12 , wherein R HUB,EX is from 4.31 in. to 14.85 in.
15 . A method of operating the gas turbine engine of claim 1 , the method comprising operating the gas turbine engine to generate an engine thrust, a redline speed of the high-pressure shaft being from 10,580 RPM to 35,788 RPM.
16 . A gas turbine engine comprising:
a turbomachine comprising a compressor section having a high-pressure compressor, a combustion section, and a turbine section having a high-pressure turbine arranged in serial flow order, the turbomachine includes an engine core including the high-pressure compressor, the combustion section, and the high-pressure turbine, the engine core having a length (L CORE ) in inches, the high-pressure compressor having an exit stage diameter (D CORE ) in inches, the high-pressure compressor defining a high-pressure compressor exit area (A HPCExit ) in square inches, and the high-pressure compressor including a high-pressure compressor flowpath and a plurality of stages of high-pressure compressor rotor blades and high-pressure compressor stator vanes, wherein the gas turbine engine defines a redline exhaust gas temperature (EGT) in degrees Celsius, a total sea level static thrust output (Fn Total ) in pounds, and a corrected specific thrust, wherein the corrected specific thrust is greater than or equal to 42 and less than or equal to 90, the corrected specific thrust determined as follows: Fn Total ×EGT/(A HPCExit 2 ×1000);
a power turbine in flow communication with the high-pressure turbine;
a low-pressure shaft coupled to the power turbine; and
a high-pressure shaft coupled to the high-pressure compressor and the high-pressure turbine, the high-pressure shaft characterized by a ratio of L CORE /D CORE greater than or equal to 2.1 and less than
4.08
(
HSP
x
-
8
)
0.14
,
wherein HSPx is a first high-speed shaft operating parameter given by:
HSPx
=
(
A
ex
)
2
*
P
STD
*
OPR
T
O
FN
T
O
*
(
N
Stg
10
)
2
,
where N Stg is a number of stages in the high-pressure compressor, A EX equal to A HPCExit , P STD is standard pressure in pounds per square inch, OPR T/O is an overall pressure ratio of the gas turbine engine at takeoff flight conditions corresponding to a maximum thrust rating for an engine core configuration, and FN T/O is a sea-level static thrust in lbf of the gas turbine engine at takeoff flight conditions corresponding to the maximum thrust rating for the engine core configuration.
17 . The gas turbine engine of claim 16 , wherein the high-pressure shaft is characterized by a high-pressure shaft rating (HSR LP ) from 0.8 to 1.6, and HSR LP is given by:
HSR
LP
=
1
k
*
N
1
r
/
l
*
D
CORE
*
(
L
CORE
D
CORE
)
2
,
where N1 r/l is a redline speed of the low-pressure shaft in RPM, and k is a constant with a value of 10 6 inch-RPM.
18 . The gas turbine engine of claim 16 , further comprising:
a fan; and
a reduction gearbox, wherein the fan is driven by the turbomachine across the reduction gearbox, wherein the reduction gearbox comprises a gear ratio between 3.2 and 4.5.
19 . The gas turbine engine of claim 16 , wherein L CORE /D CORE is less than MAX(4.8−0.088*(HSP X ), 3.18−0.015*(HSP X )).