Wind turbine augmented by a diffuser with a variable geometry

A diffuser-augmented wind turbine, comprising:

• an annular diffuser comprising a first annular leading edge and a first annular trailing edge;
• a rotor disposed within the annular diffuser, the rotor comprising a hub and at least one rotor blade coupled to the hub, the rotor coaxial with the annular diffuser about a main axis, the rotor rotatable about the main axis on a rotor plane perpendicular to the main axis, the first annular leading edge configured to allow a first air stream to be provided to the rotor plane;
• a flared diffuser assembly comprising a second annular leading edge and a second annular trailing edge, the flared diffuser coaxially coupled to the annular diffuser about the main axis, the second leading edge in fluid communication with the first trailing edge, the second leading edge configured to allow the first air stream received from the first trailing edge to enter the flared diffuser assembly, the flared diffuser assembly further comprising:
• a fixed flared diffuser comprising a first plurality of flared petals extending from the second annular leading edge toward the second annular trailing edge, each flared petal of the first plurality of flared petals extended between a first leading edge and a first trailing edge, the first leading edge attached to the second annular leading edge, each flared petal of the first plurality of flared petals further comprising two first side edges, the first leading edge and the first trailing edge comprising arcs extended between the two first side edges;
• a rotatable flared diffuser comprising an annular leading edge disposed within and encompassed by the second annular leading edge, the rotatable flared diffuser comprising a second plurality of flared petals extending from the annular leading edge toward the second annular trailing edge, each flared petal of the second plurality of flared petals extended between a second leading edge and a second trailing edge, each flared petal of the second plurality of flared petals further comprising two second side edges, the second leading edge and the second trailing edge comprising arcs extended between the two second side edges;
• the rotatable flared diffuser coaxial with the fixed flared diffuser about the main axis, the rotatable flared diffuser rotatable about the main axis;
• and
• a nacelle, the hub rotatably coupled with the nacelle.