| 摘要 |
A convergent-divergent exhaust nozzle is provided with a four-bar linkage system which allows effective variation of both the primary nozzle throat and exit areas, as well as movement of the outer nozzle, by movement of a single cam roller assembly. In addition to the convergent and divergent flaps, the linkage system includes a rigid link extending out from the exhaust duct and a compression link pivotally interconnecting the rigid link and the divergent flap. Nozzle area variations are accomplished by rotating the convergent flap about a pivot attached to the exhaust duct, with the divergent flap and the outer nozzle flap being moved accordingly. The desired nozzle throat/exit area ratio relationship can be appropriately established by proper selection of the lengths of the individual links and location of their connection points. Provision is made to readily change the length of one of the links to thereby modify the area ratio schedule as desired. |
