| 摘要 |
A gas turbine engine exhaust nozzle arrangement comprises a nozzle 14, and a plurality of noise-reducing tabs 20, The tabs 20, extend from a downstream periphery of the nozzle 14. Various means are provided for changing the operational condition of the tabs 20, according to whether or not noise reduction is required. The tabs may simply be retractable within the nozzle 14, (figure 4),or projections 34 may be provided on a rotatable (figures 5 and 6) or axially moveable (figure 7) member the projections thereby being movable to and from positions in which they cover/overlap the notches 21, between tabs 20. Movement may be effected by pinion and rack arrangements (figures 8-10) or actuators acting on a pivotal angled arm (figures 11 and 12).
|
