| 摘要 |
Apparatus for thrust reversal on a turbojet engine which includes two sets of deflector flaps which are movable into the path of exhaust gases to effect a thrust reversal. The two sets of flaps are arranged immediately one behind the other such that they can be moved jointly together to effect a thrust reversal for normal engine operation without afterburning. The flaps are also movable with respect to one another so that, with the most forward of the sets of flaps in an intermediate thrust reversal position so as to deflect flow from the thrust nozzle around the outer portions thereof, the second set of flaps arranged rearwardly of the first set can be pivoted into position for deflecting the central area of exhaust flow at a position spaced downstream of the first set of flaps. In this manner, the first set of flaps effectively deflects the cooler bypass air flow so as to create an insulating cushion for adjacent engine parts, while the second set of flaps effects a thrust reversal from the hot central exhaust gas stream. By spacing the first and second set of flaps from one another for afterburner operation, openings between the two sets of flaps in the lateral direction effect an increase in the nozzle exit discharge area to accommodate the augmented gas flow due to afterburning.
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