초록 ▼

A turbofan engine is provided that includes a core nacelle at least partially surrounded by a fan nacelle. The core nacelle includes a reflex nozzle providing a core exit. The core nacelle includes a contour on its exterior surface upstream from the reflex nozzle. The contour is generally conical an

A turbofan engine is provided that includes a core nacelle at least partially surrounded by a fan nacelle. The core nacelle includes a reflex nozzle providing a core exit. The core nacelle includes a contour on its exterior surface upstream from the reflex nozzle. The contour is generally conical and tapers toward the core exit at a first slope. The reflex nozzle tapers toward the exit at a second slope that is less steep than the first slope. The reflex nozzle includes a generally linear portion. In one example, the reflex nozzle is provided by a generally cylindrical extension that sufficiently turns the bypass flow away from the core exit so that the core flow does not become choked.

대표청구항 ▼

The invention claimed is: 1. A turbofan engine comprising:a core nacelle at least partially surrounded by a fan nacelle, the core and fan nacelles providing a bypass flow path;a turbofan rotationally driven by a turbine housed within the core nacelle, the turbofan arranged upstream from the core nac

The invention claimed is: 1. A turbofan engine comprising:a core nacelle at least partially surrounded by a fan nacelle, the core and fan nacelles providing a bypass flow path;a turbofan rotationally driven by a turbine housed within the core nacelle, the turbofan arranged upstream from the core nacelle for providing a bypass flow through the bypass flow path; anda reflex nozzle provided by the core nacelle and including a core exit, the core nacelle including an exterior surface having a contour tapering toward the core exit at a first slope, the reflex nozzle arranged downstream from the contour and tapering toward the core exit at a second slope less steep than the first slope, the reflex nozzle including a linear portion.