A fan system includes a rotor having plurality of blades and a ring airfoil, the plurality of blades being rotatably joined to a hub and the ring airfoil. The fan system may include a second contra-rotationally disposed rotor having a plurality of blades and a ring airfoil. The first and second ring airfoils having a cambered shape and an angle of attack between about −5 degrees and about 45 degrees. Passive leading edge slats are attached to the ring airfoil and are configured to open and close using springs.
Thrust Ring and Rotor Fan System with Passive Leading Edge Slats
2018-05-03
Patent
Electronic Resource
English
Thrust ring and rotor fan system with passive leading edge slats
European Patent Office | 2021
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