A gravitational vortex water turbine assembly

A gravitational vortex water turbine assembly, comprising:

• a spiral-shaped vortex basin configured to induce a vortex in a water flow under the influence of gravity, having a substantially vertical central axis, the vortex basin comprising a side wall with a tangential inflow opening for supplying the water flow to the vortex and a bottom with a central outflow opening for discharging the water flow of the vortex,
• a water turbine, disposed under the basin, coaxially with the central axis of the vortex, comprising a turbine housing, coupled to the central outflow opening and a turbine rotor,
• wherein the turbine rotor comprises a central rotor hub and rotor blades attached thereon, and
• wherein the rotor blades:
• at an upstream end have a smaller angle relative to the central axis than the angle at the downstream end;
• at a radially inward end have a larger angle relative to a plane according to the central axis than at a radially outward end;
• and
• at a radially inward end have a smaller angle relative to a plane perpendicular to the central axis than at a radially outward end,
• such that the rotor blades are configured to absorb the tangential, axial and radial component of the water flow of the vortex.