| 摘要 |
An aeronautical propulsor has a core engine (11), one or more open rotors (23,24) driven by the engine (11), and a nacelle (21) which encloses the core engine (11) and provides an aerodynamic external surface. At least a portion of the external surface of the nacelle (21) is acoustically treated to attenuate noise produced by the open rotors (23,24). |
