| 摘要 |
1,073,278. Jet propulsion nozzles. ROLLS ROYCE Ltd. Feb. 15, 1966 [March 15, 1965], No.10964/65. Heading F1J. A gas turbine jet engine comprises a variable area jet nozzle having a throat formed in part by two overlapping flap members mounted so as to be movable in such a manner as to retain the throat of the nozzle at or upstream of the plane of the nozzle outlet when the flap members are moved, the upstream flap member moving pivotally slows its upstream end and the upstream and downstream ends of the downstream flap member moving substantially radially and axially respectively. Means are provided for causing said movement of the flaps. The engine shown in Fig. 3 comprises a propulsion nozzle 13 having a throat formed in part by a pair of movable flaps 14, 15. The flap member 14 is of curved form 16 at its upstream end Fig. 2 (not shown) and of flat form 18 at its downstream end. The flap member 14 is movable between its minimum area position shown in full lines in Fig. 3 and its maximum area position shown in broken lines, by means of actuators 26 which are mounted in the aircraft fuselage 10 at one end and are connected to the flap member at the other. The upstream end of the flap member carries a roller 21 which engages in a track 23 in a bracket 24 secured to fixed structure. The downstream end of the flap member carries a roller 19 which is in rolling contact with a flat surface 20 of the aircraft fuselage. The flap member 15 is of curved form, its upstream end being pivotally mounted at 27 to fixed structure and its downstream end being in sliding overlapping engagement with the adjacent upstream end of flap member 14 by means of a roller 29 and track 30 so that the flap member 15 moves together with the flap member 14. A ramp 31 is provided upstream of the nozzle 13 so as to avoid a toorapid change in the direction of gas flow to the nozzle. Side walls 32 are provided at both sides of the flap member 14 and move into and out of slots in the aircraft fuselage. Exhaust reheat equipment may be provided as indicated at 34, 35. |
