| 摘要 |
A plug (24) has a fixed portion (26, 28) and a sliding portion (34). A tapered outer surface of portion (34) is adjacent to the throat (22) of a jet engine nozzle (20). Portion (34) includes two expansible chambers (36, 38) which are both defined by wall portions of both the fixed and the sliding portions of plug (24). Chambers (36, 38) are separated by a bulkhead (48) carried by said fixed portion. Chambers (36, 38) are supplied with fluid pressure which acts against a pressure surface (40, 42) to move sliding portion (34) axially forwardly and aftwardly, respectively, to in turn vary the throat area. Bleed air from the engine compressor supplies the fluid pressure. Fluid pressure is continuously supplied to chamber (38). Controlled leakage out of the chamber (36) provides gradual slowing of movement of portion (34) in either direction. Control apparatus is located remotely from the nozzle (20). |
