Aircraft engine
A method of operating an aircraft engine coupled to a wing of an aircraft including: setting a pitch of a plurality of rotor blades of a rotor assembly of the aircraft engine at non-uniform pitch angles along a circumferential direction of the aircraft engine such that the plurality of rotor blades define a first pitch at a first position and a second pitch at a second position, wherein the second position is 180 degrees offset from the first position, and wherein the first pitch is different from the second pitch.
1. A method of operating an aircraft engine in a forward thrust configuration coupled to a wing of an aircraft comprising:
setting a pitch of a plurality of rotor blades of a rotor assembly of the aircraft engine at non-uniform pitch angles along a circumferential direction of the aircraft engine such that the plurality of rotor blades define a first pitch at a first position and a second pitch at a second position to increase a ratio of a first airflow over a top of the wing to a second airflow over a bottom of the wing, wherein the second position is 180 degrees offset from the first position, and wherein the first pitch is different from the second pitch;
receiving data indicative of a forward thrust operating condition of the aircraft engine, the aircraft, or both; and
setting the pitch of the plurality of rotor blades to uniform pitch angles along the circumferential direction in response to receiving data indicative of the forward thrust operating condition such that the plurality of rotor blades define substantially the same pitch angles when in the first position as when in the second position.
2. The method of claim 1 , wherein receiving data indicative of the forward thrust operating condition comprises receiving data indicative of a low lift operating condition.
3. The method of claim 1 , wherein the plurality of rotor blades extend at least partially over a top of the wing when in the first position, and wherein the plurality of rotor blades extend at least partially below a bottom of the wing when in the second position.
4. The method of claim 1 , wherein the top of the wing is a suction side of the wing, and wherein the bottom of the wing is a pressure side of the wing.
5. The method of claim 1 , wherein receiving data indicative of the forward thrust operating condition comprises receiving data indicative of a second forward thrust operating condition, and wherein the method further comprises:
receiving data indicative of a first forward operating condition of the aircraft engine, of the aircraft, or both, and wherein setting the pitch of the plurality of rotor blades of the rotor assembly of the aircraft engine at non-uniform pitch angles comprises setting the pitch of the plurality of rotor blades of the rotor assembly of the aircraft engine at non-uniform pitch angles in response to the received data indicative of the first forward thrust operating condition of the aircraft engine, of the aircraft, or both.
6. The method of claim 5 , wherein the first forward thrust operating condition is a high lift operating condition, and wherein the second forward thrust operating condition is a low lift operating condition.
7. The method of claim 5 , wherein the first forward thrust operating condition is at least one of a takeoff operating condition, a climb operating condition, a descent operating condition, or a landing operating condition.
8. The method of claim 5 , wherein setting the pitch of the plurality of rotor blades of the rotor assembly of the aircraft engine at non-uniform pitch angles comprises modifying the pitch of the plurality of rotor blades to non-uniform pitch angles along the circumferential direction such that the plurality of rotor blades define the first pitch at the first position and the second pitch at the second position.
9. The method of claim 5 , wherein receiving data indicative of the first forward thrust operating condition of the aircraft engine comprises receiving data indicative of an altitude, a change in altitude, an attitude of the aircraft, an ambient pressure, or an airspeed.
10. The method of claim 1 , wherein the rotor assembly of the aircraft engine is an unducted rotor assembly.
11. The method of claim 10 , wherein the aircraft engine is configured as a single unducted rotor engine comprising a turbomachine driving the unducted rotor assembly.
12. The method of claim 1 , wherein setting the pitch of the plurality of rotor blades of the rotor assembly of the aircraft engine at non-uniform pitch angles comprises setting the pitch of the plurality of rotor blades with a pitch change mechanism.
13. The method of claim 1 , wherein the aircraft is a blended wing aircraft.
14. An aircraft engine defining a circumferential direction, the aircraft engine comprising:
a wing;
a turbomachine;
a rotor assembly comprising a plurality of rotor blades driven by the rotor assembly;
a pitch change mechanism operable with the plurality of rotor blades for changing a pitch of the plurality of rotor blades; and
a controller operably connected to the pitch change mechanism, the controller configured to:
set a pitch of the plurality of rotor blades through the pitch change mechanism to non-uniform pitch angles along the circumferential direction such that the plurality of rotor blades define a first pitch at a first position and a second pitch at a second position to increase a ratio of a first airflow over a top of the wing to a second airflow over a bottom of the wing, wherein the second position is 180 degrees offset from the first position, and wherein the first pitch is different from the second pitch;
receive data indicative of a forward thrust operating condition of the aircraft engine, the aircraft, or both; and
set the pitch of the plurality of rotor blades to uniform pitch angles along the circumferential direction in response to receiving data indicative of the forward thrust operating condition such that the plurality of rotor blades define substantially the same pitch angles when in the first position as when in the second position.
15. The aircraft engine of claim 14 , wherein the received data is data indicative of a low lift operating condition.
16. The aircraft engine of claim 14 , wherein in receiving data indicative of a forward thrust operating condition the controller is configured to receive data indicative of a second forward thrust operating condition, and wherein the controller is further configured to:
receive data indicative of a first forward thrust operating condition of the aircraft engine, of the aircraft, or both, and wherein in setting the pitch of the plurality of rotor blades of the rotor assembly of the aircraft engine at non-uniform pitch angles the controller is configured to set the pitch of the plurality of rotor blades of the rotor assembly of the aircraft engine at non-uniform pitch angles in response to the received data indicative of the first forward thrust operating condition of the aircraft engine, of the aircraft, or both.
17. The aircraft engine of claim 16 , wherein the first forward thrust operating condition is a high lift operating condition, and wherein the second forward thrust operating condition is a low lift operating condition.
18. The aircraft engine of claim 14 , wherein the rotor assembly of the aircraft engine is an unducted rotor assembly.
19. An aircraft comprising:
a wing;
an engine coupled to the wing and defining a circumferential direction, the engine comprising:
a turbomachine;
a rotor assembly comprising a plurality of rotor blades driven by the rotor assembly, the plurality of rotor blades extending at least partially over a top of the wing when in a first position and at least partially below a bottom of the wing when in a second position;
a pitch change mechanism operable with the plurality of rotor blades for changing a pitch of the plurality of rotor blades; and
a controller operably connected to the pitch change mechanism and configured to:
set a pitch of the plurality of rotor blades through the pitch change mechanism at non-uniform pitch angles along the circumferential direction such that the plurality of rotor blades define a first pitch at the first position and a second pitch at the second position to increase a ratio of a first airflow over a top of the wing to a second airflow over a bottom of the wing, wherein the second position is 180 degrees offset from the first position, and wherein the first pitch is different from the second pitch.
20. The aircraft of claim 19 , wherein the aircraft is a blended wing aircraft.