Wells turbine having passive rotor blade displacement

摘要

The invention concerns a Wells turbine, comprising a hub with a plurality of rotor blades having a drop-shaped profile orienting from a profile nose;
the rotor blades are attached to the hub in a rotary fashion by means of a foot part such that the rotor blade angle is variable with respect to the plane of rotation, wherein the associated rotational axis intersects the chord for each profile section in a threading point, which is located in a region between the profile nose and the aerodynamic center of the profile;the adjustment of the blade angle is made passively by the equilibrium occurring during the operation of the wells turbine between the aerodynamic torque, acting on the rotor blades, and the centrifugal torque, wherein the average density of the rotor blade is selected to be less than 2700 kg/m3 and/or the mass distribution within the profile is selected such that the surface centrifugal torque of the rotor blade is reduced relative to a profile made from a solid and/or the surface centrifugal torque of the rotor blades is at least partially balanced by compensatory weights, disposed at a distance from the rotational axis and perpendicular to the chord.

主权项

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.