摘要:
An inlet door system includes a duct (114), an inlet door (140), and a plurality of openings (308). The duct is configured to extend from the auxiliary power unit (APU) to an intake opening formed in an outer surface of an aircraft. The duct includes an inlet port (126), an outlet port (128), and a duct sidewall (132) extending between the inlet port and the outlet port. The inlet door includes an inner surface (302), an outer surface (304), and an outer peripheral edge (306) between the inner and outer surfaces. The door is rotationally coupled to the duct, and is configured to selectively rotate between a closed position and a plurality of open positions. The openings extend through the inlet door (140) between the inner surface (302) and outer surface (304), and each opening (308) is disposed adjacent to the outer peripheral edge (306).
摘要:
Auxiliary power unit inlet apparatus and methods are disclosed. An example apparatus (202) includes an air inlet (205) for an aircraft (100) including a first air flow path (212) and a second air flow path (214). The first air flow path (212) is immediately adjacent the second air flow path (214). The first air flow path (212) is at least partially separated from the second air flow path (214) by a first panel (216). The example apparatus (202) includes a door (204) hingeably coupled adjacent the air inlet (205). The door (204) includes a second panel (208) extending from an interior surface (306) of the door (204) to substantially prevent air from flowing across the interior surface (306) between the first air flow path (212) and the second air flow path (214).
摘要:
An inlet door and actuation mechanism for an auxiliary power unit has an actuation mechanism mounted within a housing (34). The housing includes a bearing mount (46) or allowing a bearing (48) on the mechanism to adjust angularly as the inlet door pivots. The bearing mount and bearing provides a fireproof enclosure between areas (110,111) on opposed sides of a wall of the housing.
摘要:
An inlet door system (109) including an aft inlet duct mounted door actuator providing RAM air to an auxiliary power unit (APU) (110) contained within an aircraft is provided. The inlet door system includes an inlet duct (120), the aft inlet duct mounted door actuator (134), and a door (130). The inlet duct (120) is configured to extend from the auxiliary power unit (110) to the aircraft housing and has a sidewall (126) that defines a flow passage. The door actuator (134) is mounted to an exterior surface of the aft portion of the inlet duct (120). The door (130) is coupled to the actuator (134). The actuator (134) is configured to selectively rotate the door (130) between at least a first position and a second position.
摘要:
An inlet door assembly (26) for reducing air pressure loss and enhancing performance of an auxiliary power unit (APU) contained within an aircraft housing is provided. The inlet door assembly includes a duct (34) and a diffuser (36). The duct, which is configured to be movably coupled to an aircraft and to move between open and closed positions, has a flow passage (42) extending therethrough. Air external to the aircraft flows through the duct while it is in the open position, but not while it is in the closed position. The diffuser is coupled to the duct and configured to move therewith. The diffuser has a passage (64) extending therethrough that is in fluid communication with the duct flow passage, and is configured to diffuse the air that flows therethrough.
摘要:
An eductor assembly (104) is provided that includes a primary nozzle (114), a cooler plenum (120), and a surge plenum (122). In one embodiment, and by way of example only, the primary nozzle (114) is configured to accelerate and discharge turbine exhaust gas therefrom and the cooler plenum (120) surrounds the primary nozzle (114) and includes at least a fluid inlet (134) and a fluid outlet (136). The surge plenum (122) partially surrounds the primary nozzle (114) and the cooler plenum (120) and includes at least a fluid inlet (154) and a fluid outlet (156). The surge plenum fluid outlet (156) axially aligns and is coterminous with the cooler plenum fluid outlet (136).
摘要:
A passive cooling system for an auxiliary power unit (APU) installation on an aircraft is provided. The system is for an auxiliary power unit having at least a compressor portion of a gas turbine engine and an oil cooler contained separately within a nacelle. The system includes the auxiliary power unit housed within the nacelle of the aircraft, an engine exhaust opening defined in the aft portion of the nacelle and communicating with the gas turbine engine, at least a first air inlet duct communicating with a second opening defined in said nacelle and with said compressor portion and the oil cooler is located within a second duct communicating with an opening other than the engine exhaust opening of said nacelle and with the engine exhaust opening. Exterior cooling air and engine exhaust ejected through said engine exhaust opening entrain cooling air through said second duct to said oil cooler, and thus provide engine oil cooling. An exhaust eductor is also provided.