Abstract:
PROBLEM TO BE SOLVED: To provide a gas turbine engine with a variable area nozzle requiring no large-scale maintenance without largely increasing the total weight of the gas turbine engine. SOLUTION: The gas turbine engine 10 includes a variable area nozzle 30 having a plurality of flaps 38. The flaps 38 are actuated by a plurality of actuating mechanisms 40 to be driven by a shape memory alloy(SMA) actuator 68. The SMA actuator 68 has a deformed shape in a martensitic state and a basic shape in an austenitic state. The SMA actuator 68 is heated to transform from the martensitic state into the austenitic state generating a force to actuate the flaps 38. The variable area nozzle 30 also contains a plurality of return mechanisms 42 for deforming the SMA actuator 68 when in the martensitic state.
Abstract:
PROBLEM TO BE SOLVED: To provide a variable exhaust nozzle adapted to be largely varied in its area without adversely affecting its outside shape and aerodynamic characteristics. SOLUTION: A variable exhaust nozzle 26 of a turbine engine nacelle 16 involves a pair of semi-cowls 58 and 60 arranged around the longitudinal center axis 14 of the nacelle, and a pair of shells associated thereto. The shells are spaced away from the associated semi-cowls radially inward, and are adapted to revolve on their dedicated pivots between their pulled-out positions and pulled-back positions. The semi-cowl and the shell respectively have an inner surface 86 and an outer surface 100 which form the same geometric curve, such that a gap 108 defined therebetween is held constant irrespective of the angular position of the shell.
Abstract:
A flanged apparatus includes an apparatus body and a flanged mount, which includes a support pylon, a first mounting flange and a second mounting flange. The support pylon includes a first pylon segment, a second pylon segment and a routing notch. The first pylon segment is cantilevered from the apparatus body, and extends to the first mounting flange. The second pylon segment is cantilevered from the first pylon support, and extends from the first mounting flange to the second mounting flange. The routing notch extends vertically between the first pylon segment and the second pylon segment. The first mounting flange and the second mounting flange extend laterally from the support pylon, and the first mounting flange is separated from the second mounting flange by a longitudinal distance and a vertical distance.
Abstract:
A gas turbine engine includes a nacelle assembly having a core nacelle defined about an engine axis and a fan nacelle assembly mounted at least partially around the core nacelle to define a fan bypass flow path. The fan nacelle assembly includes a fan duct nacelle section and a fan nozzle nacelle section moveable relative to the fan duct nacelle section. A thrust reverser system includes a plurality of pivot doors movable relative to the fan nacelle assembly between stowed and deployed positions. A variable area fan nozzle is in communication with the fan bypass flow path. A first actuator is mounted to the fan duct nacelle section to actuate the pivot door thrust reverser system, and a second actuator is mounted to the fan duct nacelle section to move the fan nozzle nacelle section relative to the fan duct nacelle section to vary a fan nozzle exit area.
Abstract:
A gas turbine engine (10) includes a variable area nozzle (30) having a plurality of flaps (38). The flaps (38) are actuated by a plurality of actuating mechanisms (40) driven by shape memory alloy (SMA) actuators (68) to vary fan exist nozzle area (36). The SMA actuator (68) has a deformed shape in its martensitic state and a parent shape in its austenitic state. The SMA actuator (68) is heated to transform from martensitic state to austenitic state generating a force output to actuate the flaps (38). The variable area nozzle (30) also includes a plurality of return mechanisms (42) deforming the SMA actuator (68) when the SMA actuator (68) is in its martensitic state.
Abstract:
A gas turbine engine (10) includes a variable area nozzle (30) having a plurality of flaps (38). The flaps (38) are actuated by a plurality of actuating mechanisms (40) driven by shape memory alloy (SMA) actuators (68) to vary fan exist nozzle area (36). The SMA actuator (68) has a deformed shape in its martensitic state and a parent shape in its austenitic state. The SMA actuator (68) is heated to transform from martensitic state to austenitic state generating a force output to actuate the flaps (38). The variable area nozzle (30) also includes a plurality of return mechanisms (42) deforming the SMA actuator (68) when the SMA actuator (68) is in its martensitic state.