Patent ID: 8829706

Claim:
An annular wing turbine wind and water system comprising: at least two separate annular wing stages connected in tandem axial configuration at least the rearmost of said stages having an active circulation control comprising: a specific annular wing geometry having an annular inner surface and an annular outer surface and an annular trailing edge, the inner surface geometry defining a suction side of the annular wing and the outer surface geometry defining a pressure side of the annular wing; an annular plenum chamber extending interiorly around the annular wing and having an annular exit slit pointing rearwardly for rearwardly exiting fluid from the plenum; the trailing edge being a rounded surface oriented with respect to the exit slot to define a rounded Coanda surface upon exiting of air or water as the case may be from the exit slot; whereby an exiting annular sheet of air or water from the plenum chamber flows along the rounded surface according to the Coanda principle.