A cylinder 1 is positioned across a turbofan engine bypass duct 2. The duct 2 may be blocked using a blocker door 3, creating an aperture 4 in the nacelle. The cylinder spins, deflecting fan flow out of the aperture due to a Magnus effect, achieving thrust reversal. The cylinder can be electrically driven. Alternatively the fan flow, core flow, or free stream flow may rotate the cylinder. Vanes may be fitted to the cylinder to assist with flow driven rotation. Surface roughness may be added to increase skin friction between cylinder and fan flow. The cylinder may be shielded and only exposed where needed. The cylinder may be stowed out of the fan duct. Multiple spinning cylinders may be used. The cylinder may produce other thrust vector angles, used for pitch control, additional or reduced lift, or achieving the function of a variable area nozzle for the fan flow.
Use of spinning cylinders to achieve thrust reversal
2020-12-09
Patent
Electronic Resource
English
NTIS | 1965
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