Turbomachine thermal management
An example turbomachine assembly includes, among other things, a nose cone of a turbomachine, and a pump at least partially within an interior of the nose cone. The pump is selectively rotated by a motor to communicate air to the interior.
1. A turbomachine assembly, comprising:
a nose cone of a turbomachine;
a pump at least partially within an interior of the nose cone, the pump selectively driven by a motor to communicate air to the interior;
wherein the pump is selectively rotated by the motor or a shaft directly driven by a turbine of the turbomachine; and
a clutch that is selectively moved between an engaged position and a disengaged position to rotate the pump using the motor or the shaft.
2. The turbomachine assembly of claim 1 , wherein the pump communicates air through an aperture provided by a leading edge of the nose cone relative to a direction of flow through the turbomachine.
3. The turbomachine assembly of claim 1 , wherein the nose cone establishes a portion of a radially inner boundary of flow entering a fan section of the turbomachine.
4. The turbomachine assembly of claim 1 , including a geared architecture rotatably linking a fan to the shaft, the geared architecture causing the fan to rotate at a different speed than the shaft.
5. The turbomachine assembly of claim 1 , wherein the clutch is a ratchet clutch.
6. The turbomachine assembly of claim 1 , wherein the clutch is in the engaged position when rotating the pump using the shaft.
7. The turbomachine assembly of claim 1 , wherein the shaft directly drives the pump at a 1 to 1 ratio when the clutch is in the engaged position.
8. The turbomachine assembly of claim 1 , including a heat exchanger that receives air communicated to the interior by the pump.
9. The turbomachine assembly of claim 8 , wherein the heat exchanger is forward a fan blade section of the turbomachine relative to a direction of flow through the turbomachine.
10. The turbomachine assembly of claim 8 , wherein air communicated to the interior by the pump carries thermal energy from the heat exchanger.
11. The turbomachine assembly of claim 1 , wherein air that has moved to the interior adds thermal energy to the nose cone.
12. The turbomachine assembly of claim 1 , wherein air that has moved to the interior buffers a seal.
13. The turbomachine assembly of claim 1 , wherein the turbomachine has a bypass flowpath, and air that has moved through to the interior is communicated from an inner diameter of a core flowpath to an outer diameter of the core flowpath.
14. A turbomachine assembly, comprising:
a nose cone of a turbomachine; and
a pump at least partially within an interior of the nose cone, the pump selectively driven by a motor to communicate air to the interior;
wherein an inlet to a low pressure compressor of the turbomachine is downstream from the fan relative to a general direction of flow through the turbomachine.
15. A turbomachine assembly, comprising:
a nose cone having an interior extending forward a fan section of a turbomachine;
a pump that is selectively driven by a shaft or a motor to communicate air to the interior, wherein the pump rotates at the same speed as the shaft when the pump is driven by the shaft, and the pump rotates at the same speed as the motor when the pump is driven by the motor; and
a clutch that is selectively moved between an engaged position and a disengaged position to rotate the pump using the motor or the shaft.
16. The turbomachine assembly of claim 15 , wherein the shaft rotates at the same speed as a low-speed spool of the turbomachine when the pump is driven by the shaft.
17. The turbomachine assembly of claim 15 , including a geared architecture that is driven by the shaft to rotate a fan of the turbomachine at a higher rotational speed than the shaft.
18. The turbomachine assembly of claim 15 , wherein the fan section that drives air along a bypass flowpath defined by a bypass duct, and air that has moved through to the interior is communicated from an inner diameter of a core flowpath defined by a compressor section to an outer diameter of the core flowpath, the bypass flow path radially outward of the core flow path with respect to an engine longitudinal axis.
19. The turbomachine assembly of claim 15 , wherein an inlet to a low pressure compressor of the turbomachine is downstream from the fan section relative to a general direction of flow through the turbomachine.
20. A method of communicating air within a turbomachine, comprising:
using a pump to move air along a path from a first position outside a nose cone interior directly to a second position within the nose cone interior; and
selectively driving the pump using a shaft or a motor, including selectively moving a clutch between an engaged position and a disengaged position to rotate the pump using the motor or the shaft;
wherein the pump rotates at the same speed as the shaft when the pump is driven by the shaft, and the pump rotates at the same speed as the motor when the pump is driven by the motor.
21. The method of claim 20 , wherein an inlet to a low pressure compressor of the turbomachine is downstream from a fan relative to a general direction of flow through the turbomachine, the nose cone being axially forward from a plurality of fan blades of the fan.