Patent ID: 7845899

Claim:
A fluid turbine, comprising: a rotor and blade assembly, including: a rotor, the rotor being rotatable about a rotation axis; a plurality of blades, each of the blades having a tip, the blade tips defining a blade tip radius with respect to the rotation axis; a fluid displacement head arrangement blocking off at least 50% of the blade tip radius from the rotation axis towards the blade tips, the fluid displacement head arrangement shaped to redirect blocked-off fluid towards the blades extending radially beyond a blocked-off area; and a single annular fluid intake scoop and flow through encasement assembly surrounding the rotor and blade assembly, the encasement assembly having an interior surface and an exterior surface, the exterior surface of the encasement assembly being shaped to form an fluid-foil, so as to provide converging fluid flow for augmenting exhaust from the turbine; wherein fluid flowing through the encasement assembly enters the encasement assembly solely through one central opening formed between the interior surface of the encasement assembly and the rotor and blade assembly.