PROPULSION DEVICE HAVING UNDUCTED COUNTER-ROTATING AND COAXIAL ROTORS

摘要

The invention relates to the field of propulsion devices (1) having an unducted upstream rotor (8) and a counter-rotating and coaxial downstream rotor (9). At least one blade (13) of the upstream rotor (8) is configured so as to generate a co-rotating secondary vortex (11) for destabilizing, upstream of the downstream rotor (9), a blade-tip vortex (10) on the same blade (13).