| 摘要 |
A convergent-divergent jet exhaust nozzle has an aft end with an exit area thereat and a throat area spaced from the exit area and forward thereof. The ratio of the exit to throat diameter is from 1.00 to 1.05. Each of two symmetrical blocker doors has an axis coincident with the axis of the nozzle. Each of the blocker doors has opposite forward and rear edges and a surface extending between the edges. Each of the blocker doors is pivotally mounted to pivot about a pivot axis transverse to the axis of the nozzle and disposed downstream of the engine in the nozzle. The pivot axes are in a plane intersected by the axis of the nozzle. Each of the blocker doors has an inner surface and an outer surface and is movable between a first, stowed, position in which the inner surfaces thereof are contiguous with the inner surface of the nozzle and the forward and rear edges thereof are spaced from each other so that the nozzle is unobstructed and a second, fully deployed, position in which the rear edges are in closely adjacent relation and the inner surfaces form a continuous obstruction across the nozzle thereby blocking the nozzle flow and causing such flow to be diverted outward through cascade vanes which direct the flow in a partly forward direction to produce reverse thrust. A moving system is coupled to the blocker doors for selectively pivoting such doors about their axes in directions toward and away from each other. A latching device releasably latches the doors in the stowed position.
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