Turbine engine including an air turbine starter
A turbine engine having an engine core having a compression section, combustion section, a turbine section, and an engine drive shaft. The turbine engine includes an air turbine starter having a housing defining an air flow passage. The air turbine starter can operate in a start-up mode and a shut-down mode. The turbine engine further includes a gearbox and a drive unit.
1. A turbine engine comprising:
an engine core having a compression section, a combustion section, and a turbine section in serial flow arrangement, the engine core having an engine drive shaft;
an air turbine starter comprising:
a housing defining an air flow passage extending between a first opening and a second opening; and
a turbine having a plurality of circumferentially spaced blades located within the air flow passage;
a set valves;
a first conduit extending from the set of valves and to the first opening;
a second conduit extending from the set of valves and to the engine core;
a gearbox selectively connecting the turbine to the engine drive shaft when the air turbine starter is operable in a start-up mode in which air is provided to the air turbine starter through the first opening via the first conduit and at least one valve of the set of vales such that the air flows through the air flow passage in a first direction to cause the turbine to rotate; and
a drive unit selectively coupled to the turbine, the drive unit configured to rotate the turbine during a shut-down mode in order to draw in air through the second opening and into the air flow passage in a second direction, opposite the first direction, wherein the air drawn in through the second opening during the shut-down mode flows through the first opening, the first conduit, at least one valve of the set of valves, the second conduit and is fed to at least one of the compression section or the turbine section.
2. The turbine engine of claim 1 , further comprising a fluid control assembly having a controller for selectively fluidly coupling the air turbine starter to a pressurized air source when the air turbine starter is in the start-up mode through at least one valve of the set of valves and the first conduit, or to one or more portions of the turbine engine when the air turbine starter is in the shut-down mode through at least one valve of the set of valves, the first conduit and the second conduit.
3. The turbine engine of claim 1 , wherein the drive unit includes a power source operably coupled to a drive shaft, wherein the drive shaft is selectively coupled to the turbine.
4. The turbine engine of claim 3 , wherein the power source is located exterior of the housing of the air turbine starter.
5. The turbine engine of claim 1 , further comprising at least one conduit fluidly coupling the first opening of the air turbine starter to a high-pressure compressor of the compression section or a high-pressure turbine of the turbine section.
6. The turbine engine of claim 1 , further comprising a first set of circumferentially spaced vanes located forward of the turbine and a second set of circumferentially spaced vanes located aft of the turbine.
7. The turbine engine of claim 6 , wherein the first set of circumferentially spaced vanes, the second set of circumferentially spaced vanes, or combination therein, include one or more variable vanes.
8. A turbine engine comprising:
an engine core having a compression section, a combustion section, and a turbine section in serial flow arrangement, the engine core having an engine drive shaft;
a bi-directional air turbine starter having a housing defining a first opening, a second opening, and an air flow passage extending between the first opening and the second opening, the bi-directional air turbine starter selectively coupled to the engine drive shaft;
a drive unit having a power source operably coupled to a drive shaft, wherein the drive shaft is selectively coupled to the bi-directional air turbine starter;
a set of valves; and
a fluid control assembly selectively fluidly coupling the first opening of the bi-directional air turbine starter to one or more portions of the engine core, the fluid control assembly comprising a controller in communication with the set of valves and having a processor and a memory, the processor of the controller configured to:
in a start-up mode selectively operate at least one valve of the set of valves to direct a flow of pressurized air into the bi-directional air turbine starter through the first opening such that the flow of pressurized air flows in a first direction through the air flow passage; and
in a shut-down mode selectively operate at least one valve of the set of valves to direct a flow of ambient air into the bi-directional air turbine starter through the second opening such that the flow of ambient air flows in a second direction, opposite the first direction, through the air flow passage, out the first opening and to the one or more portions of the engine core.
9. The turbine engine of claim 8 , wherein the fluid control assembly comprises at least one conduit fluidly coupling the first opening to a high-pressure compressor of the compression section or a high-pressure turbine of the turbine section.
10. The turbine engine of claim 8 , wherein the power source includes an electric motor.
11. The turbine engine of claim 8 , wherein when the bi-directional air turbine starter is selectively coupled to the engine drive shaft, an air turbine starter drive shaft rotates in a first direction.
12. The turbine engine of claim 11 , wherein when the bi-directional air turbine starter is selectively coupled to the engine drive shaft, compressed air flows from the first opening to the second opening.
13. The turbine engine of claim 11 , wherein when the bi-directional air turbine starter is selectively coupled to the power source, the air turbine starter drive shaft rotates in a second direction.
14. The turbine engine of claim 8 , wherein the bi-directional air turbine starter is an air turbine starter when selectively coupled to the engine drive shaft, and the bi-directional air turbine starter is a compressor when selectively coupled to the power source.