摘要:
The invention concerns a heat transfer arrangement for a fluid-washed body (25;123;124) having first (26;128) and second (32;132) ends and a fluid-washed surface extending there-between. The arrangement comprises a heat transfer member (28;133) extending from the first end at least part way along the body towards the second end. A heat source (27;136) is arranged in use to heat the heat transfer member (28;133) in the vicinity of the first end of the body. A plurality of thermal control layers (29,30,31;134,135) are provided on said heat transfer member, each of said layers having a different thermal conductivity and being juxtaposed so as to create a thermal conductivity profile which varies along the length of the member. The arrangement may be used for prevention of icing of an aerofoil body such as a blade, vane or the like.
摘要:
A gas turbine engine propulsion system (10) in which a first propulsive unit (12) has a core engine (42,44,46) and a first low pressure turbine (24) arranged to be driven by combustion products from the core engine. The first propulsive unit also has a first fan rotor (32) and a first fan shaft drivingly connecting the first turbine (24) and the first fan rotor (32). The propulsion system also has a further turbine (22) arranged in flow series with the first turbine (24) and a second propulsive unit (18) spaced from the first propulsive unit (12). The second propulsive unit has a second fan rotor (28) driven by the rotational output of the further turbine (22). The further turbine may be located in the second propulsive unit and may be in fluid communication with the first turbine (24) via an inter-turbine duct (26).
摘要:
An aircraft comprises a propulsive fan arrangement (18) having an intake (50) and an exhaust (52). The fan arrangement (18) is mounted adjacent a gas washed surface of the aircraft in the form of a suction surface (14) of a wing (12). The intake (50) is separated from the suction surface (14) to define a channel (20) therebetween. The aircraft further comprises a Venturi device (22) positioned downstream of the fan exhaust (52) to draw boundary layer air (56) through the channel (20).
摘要:
This invention relates to an aircraft comprising: a first propulsive unit (12) having a first fan (30) with an axis of rotation (22); and a second propulsive unit (14) local to the first propulsive unit, the second propulsive unit having a second fan (52) with an axis of rotation (42), wherein the rotational axis (22) of the first fan (30) is proximate to the surface of the aircraft (50) relative to the rotational axis (42) of the second fan (52) such that the first fan ingests boundary layer air when in use.
摘要:
A cooling system for a gas turbine engine (10). The system comprises a fuel air heat exchanger (78) comprising a fuel passage (80) in thermal contact with an engine cooling air passage (82). The system further comprises a fuel deoxygenator (72) located upstream of the fuel air heat exchanger (78) configured to deliver deoxygenated fuel to the fuel air heat exchanger fuel passage (80). The system includes a valve (84) configured to moderate engine cooling air flow to the engine cooling air passage (82).
摘要:
The invention concerns a heat transfer arrangement for a fluid-washed body (25;123;124) having first (26;128) and second (32;132) ends and a fluid-washed surface extending there-between. The arrangement comprises a heat transfer member (28;133) extending from the first end at least part way along the body towards the second end. A heat source (27;136) is arranged in use to heat the heat transfer member (28;133) in the vicinity of the first end of the body. A plurality of thermal control layers (29,30,31;134,135) are provided on said heat transfer member, each of said layers having a different thermal conductivity and being juxtaposed so as to create a thermal conductivity profile which varies along the length of the member. The arrangement may be used for prevention of icing of an aerofoil body such as a blade, vane or the like.
摘要:
A cooling system for a gas turbine engine (10). The system comprises a fuel air heat exchanger (78) comprising a fuel passage (80) in thermal contact with an engine cooling air passage (82). The system further comprises a fuel deoxygenator (72) located upstream of the fuel air heat exchanger (78) configured to deliver deoxygenated fuel to the fuel air heat exchanger fuel passage (80). The system includes a valve (84) configured to moderate engine cooling air flow to the engine cooling air passage (82).
摘要:
This invention relates to a heat exchanger, comprising a plurality of stacked corrugated plates, each plate having a plurality of parallel main corrugations each having longitudinal peak ridges and trough ridges, wherein either or both of the peak ridges and trough ridges have an undulating profile so as to define a plurality of summits in a common plane.
摘要:
This invention relates to a method and apparatus for controlling power distribution in an electrical aircraft propulsive system having at least one electrical propulsion unit (12) which includes a plurality of rotatable blades (14), each blade having an adjustable pitch; a pitch adjusting mechanism for adjusting the pitch of the blades (14); at least one electrical machine electrically connected to the electrical propulsion unit (12) so as to provide electrical power when in use; and, a control system, the method comprising the steps of: determining the required propulsion; determining whether the propulsive units are delivering the required propulsion; and, adjusting the pitch angle of the blades of at least one propulsive unit so as to increase or decrease the propulsion provided by that propulsive unit.
摘要:
The invention relates to a duct for a vehicle, comprising: an elongate passageway (212) defined by at least one wall (217), the passageway (212) having first and second ends relative to the longitudinal axis of the passageway (212); a non-annular inlet (216) at the first end of the passageway for receiving a first fluid flow from the boundary layer of the vehicle when in use; and, an annular outlet (226, 228) at the second end of the passageway (212) having an radially inner circumferential wall and a radially outer circumferential wall, the annular outlet (226, 228) being in fluid communication with a propulsive unit when in use, wherein the radially inner and outer circumferential walls extend continuously to the inlet (216).