Patent ID: 9062650
Filing Date: 2015-06-23
Classification: F03B,F03D,F05B,F05C,Y02E

Abstract:
1. A wells turbine for exploiting a bidirectional flow, the wells turbine comprising: a hub; and a plurality of rotor blades attached to the hub in a rotary fashion using a foot part such that a rotor blade angle is freely variable with respect to a plane of rotation, wherein an associated rotational axis intersects a chord for each profile section in a threading point, wherein the threading point is located in a region between a profile nose and an aerodynamic center of a profile; wherein the profile of the rotor blades is a drop-shaped profile oriented from the profile nose, wherein the drop-shaped profile is an airfoil producing lift and drag; wherein the wells turbine is set to rotate during operation such that an adjustment of the rotor blade angle is made passively by an equilibrium occurring between an aerodynamic torque and a centrifugal torque acting on the rotor blade, wherein the rotor blade has at least an average density less than 2700 kg/m3, a mass distribution within the profile wherein the surface centrifugal torque of the rotor blade is reduced compared to a profile made of solid material, and a surface centrifugal torque of the rotor blades that is at least partially balanced by compensatory weights, wherein each of the compensatory weights has a center of mass disposed at a distance from the rotational axis in a traverse direction with respect to the chord, wherein the distance from the rotational axis is larger in a perpendicular direction with respect to the chord than in a parallel direction with respect to the chord, wherein the compensatory weights are arranged within or on the foot part in a pair-wise manner to both sides of the chord.