| 主权项 |
1. A nozzle system that comprises:
a first nozzle that comprises a first aft portion that comprises a first outer surface that comprises a first shape, wherein the first shape and a second shape of a second outer surface of a second aft portion of a second nozzle each comprises a wavy shape, such that in operation, in response to formation of a first shock-cell pattern in a first jet stream that exits the first nozzle during operation of the nozzle system during a cruise phase of a flight, the first shape and the second shape reduce a first noise associated with the first shock-cell pattern; the second nozzle is at least partially surrounded by the first nozzle, and configured such that: a first radial cross-section of the second outer surface comprises a first curve that varies from at least a second curve for a second radial cross-section of the second outer surface; and an axial cross-section of the second outer surface comprises a wavy shape; and a plug that comprises a plug aft portion that comprises a plug outer surface that comprises a third shape comprising a wavy shape located downstream of the wavy shape of the second nozzle such that in operation, in response to formation of a second shock-cell pattern in a second jet stream that exits the second nozzle during operation of the nozzle system during the cruise phase of the flight, the second shape and the third shape reduce a second noise associated with the second shock-cell pattern, wherein the plug comprises an interior passage that outlets a third jet stream. |
