摘要:
A variable geometry (2) structure comprising: an flexural element (4); a tensioning element (6) connected to the flexural element (8); and an actuator (12) for adjusting the tensioning element (6) to change the load placed on the flexural element (4), thereby changing the geometry of the structure (2).
摘要:
Varying the fan nozzle flow area in a gas turbine engine 1 allows adjustment of the bypass flow for varying operational conditions such as cruise and take off. However, care must be taken with regard to variation in order not to introduce drag or operational susceptibility to failure. By provision of a deformable member having a contiguous surface 4, 14, 54 which is deformed laterally from a splitter such as a pylon 5, 15, 55 variation in flow area is achieved. A deformable member 4, 14, 54 will be secured through seals 18, 58 to ensure a smooth surface. Actuation may be through a shape memory alloy material or provision of mechanical actuators 10 to cause deformation of the contiguous surface 4, 14, 54.
摘要:
An actuator is provided having a temperature activatable actuating member comprising an inductively couplable material. The actuator has an electrical heating element for electrically heating the actuating member. The heating element is configured to inductively couple with said material when an AC current is passed through the heating element such that an opposing electromotive force is induced in the heating element. A detector is provided for detecting activation of the actuating member by sensing a change in the AC impedance of the heating element.
摘要:
A variable fan nozzle for use in a gas turbine engine includes a nozzle section, such as an inflatable bladder, associated with a fan bypass passage for conveying a bypass airflow. The nozzle section has an internal fluid pressure that is selectively variable to influence the bypass airflow.
摘要:
A nozzle (12) includes a sideways split and aftwardly swept nozzle ramp (18) extends between a fixed lower nozzle wall (16) and a pivotal upper nozzle wall (14) pivotally connected to an aft end (104) of the nozzle (12) and operable to vary a throat area (A8) of a throat (28) of the nozzle (12). The upper and lower nozzle walls (14 and 16) and the ramp (18) extend transversely between first and second nozzle sidewalls (20 and 22). A sideways pivotable ramp structure (24) pivotally connected to the lower nozzle wall (16) and pivotable between the sidewalls (20 and 22) includes a longitudinally extending upper pivotable wall (34) spaced upwardly and aftwardly of a longitudinally extending lower pivotable wall (36) and an aftwardly swept pivotable ramp (38) extending between the upper and lower pivotable walls (34 and 36). Right hand and left hand upper ramp sections (96 and 98) of the nozzle ramp (18) may be connected to right hand and left hand upper nozzle wall sections (100 and 102) respectively of the upper nozzle wall (14) which are pivotally connected to right and left handed triangular side walls (158 and 159) of the aft end (104).
摘要:
An exhaust nozzle 234 comprising inner and outer walls defined by a turbine casing 233 and a nacelle 230 respectively. A duct in the form of a bypass duct 232 is defined therebetween through which a bypass flow B flows in use. The nacelle 230 comprises a fixed upstream wall section 240 and at least one radially movable downstream wall section 242. At least one closure element in the form of a first slat 248 is provided, which is locatable across the second outlet 246 extending in a generally axial direction. A downstream end 250 of the first slat 248 is radially moveable between an open position in which the second outlet 246 is open, and a closed position in which the second outlet 246 is closed.
摘要:
A variable geometry (2) structure comprising: an flexural element (4); a tensioning element (6) connected to the flexural element (8); and an actuator (12) for adjusting the tensioning element (6) to change the load placed on the flexural element (4), thereby changing the geometry of the structure (2).
摘要:
A variable fan nozzle for use in a gas turbine engine includes a nozzle section, such as an inflatable bladder, associated with a fan bypass passage for conveying a bypass airflow. The nozzle section has an internal fluid pressure that is selectively variable to influence the bypass airflow.
摘要:
A turbofan engine (10) includes a variable area fan nozzle (42) which effectively changes the physical area and geometry within a fan bypass flow path (40) to manipulate the pressure ratio of the bypass flow with a multitude of bladders (52A...52D) circumferentially located about a core cowl (12). A method of varying such a fan nozzle exit area with a bladder system is also disclosed.