Abstract: 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 to

Abstract: There is provided a free standing tidal power plant without a dam structure set to take up kinetic energy from a water flow. The tidal power plant includes a propeller-shaped water turbine in horizontal rotor configuration with rotor blades, the rotor blades having bidirectional profiles, wherein the rotor blades are fastened to a revolving unit, which defines a rotational plane, and an electric generator at least indirectly driven by the water turbine. Each rotor blade is associated with a first swivel axis and a second swivel axis, the first axis and the second swivel axis extending substantially along a longitudinal axes of a first coupling element and a second coupling element, respectively. The revolving unit includes a planar guide region having a sliding apparatus, a first guide groove and a second guide groove, the sliding apparatus connected to the rotor blade to transmit rotor blade forces.

Abstract: The invention relates to a flow power plant, comprising a water turbine having torsionally rigid rotor blades, a drive train connected to the water turbine, which at least indirectly drives an electric generator and is characterized in that at inflow speeds v for which the flow power plant is designed, the water turbine is configured to be non-auto-restarting for tip speed ratios ? below a predetermined auto-restart tip speed ratio ?s where ?s?1.

Abstract: There is provided a maritime current power plant park that includes a plurality of maritime current power plants, where each of the plurality of maritime current power plants has a rotor-like water turbine, an electric generator, and a drive train connecting the electric generator to the rotor-like water turbine. The drive train has bearing components for supporting the rotor-like water turbine. At least two of the plurality of maritime current power plants have differently dimensioned rotor-like water turbines, and the drive train of each of the at least two of the plurality of maritime current power plants is uniform.

Abstract: The invention relates to a Wells turbine, comprising a hub having a plurality of rotor blades having a drop-shaped symmetrical profile originating from a leading edge; the rotor blades have a threading line, whose course in the rotation plane of the Wells turbine deviates in relation to a radial beam associated with the respective rotor blade at least in parts of the radial extension of the rotor blade, the threading line comprising at least one curved area.

Abstract: The invention concerns a method for the operation of an underwater power plant with a water turbine to take up kinetic energy from a surrounding flow; and an electrical generator coupled directly to the water turbine; characterized in that the power regulation in the generator mode is done by a control or regulation of the load moment produced by the electrical generator for a freely adjusting rpm speed of the water turbine, wherein the setpoint value of the load moment in a first, power-optimized operating range is established by a state controller and/or a search mechanism for the power maximum; and in a second, power-limited operating range the assigned load moment is chosen so that an operating point distant from the power optimum results for the water turbine.

Abstract: The invention relates to a flow power plant, comprising a water turbine having torsionally rigid rotor blades, a drive train connected to the water turbine, which at least indirectly drives an electric generator and is characterized in that at inflow speeds v for which the flow power plant is designed, the water turbine is configured to be non-auto-restarting for tip speed ratios ? below a predetermined auto-restart tip speed ratio ?s where ?s?1.

Abstract: The invention relates to a turbine blade for a water turbine, comprising, at least over part of its length, a curved profiled element having a median line created point-symmetrically in relation to a point of symmetry on the chord of the profiled element, half-way down, in such a way as to form an S-shaped curve. The median line splits the profiled element into a first side and a second side. The invention is characterised in that the turbine blade comprises an overflow device between the first side and the second side of the profiled element.

Abstract: The invention relates to a maritime current power plant park, comprising several maritime current power plants which respectively comprise a rotor-like water turbine and an electric generator which are connected by means of a drive train, with the drive train comprising bearing components for supporting the rotor-like water turbine. The invention is characterized in that at least two of the maritime current power plants comprise differently dimensioned rotor-like water turbines and similar drive trains.

Abstract: The invention relates to a Wells turbine, comprising a hub having a plurality of rotor blades having a drop-shaped symmetrical profile originating from a leading edge; the rotor blades have a threading line, whose course in the rotation plane of the Wells turbine deviates in relation to a radial beam associated with the respective rotor blade at least in parts of the radial extension of the rotor blade, the threading line comprising at least one curved area.

Abstract: 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 tor

Abstract: The invention relates to an immersible power generation plant driven by a water flow, particularly a tidal current, comprising a water turbine in the form of an axial turbine with an associated rotational axis. The water turbine comprises at least one turbine blade that is designed such that the course of the threading line of the profile sections thereof deviates from the radial flow when projected on the rotational plane.

Abstract: The invention concerns a method for the operation of an underwater power plant with a water turbine to take up kinetic energy from a surrounding flow; and an electrical generator coupled directly to the water turbine; characterized in that the power regulation in the generator mode is done by a control or regulation of the load moment produced by the electrical generator for a freely adjusting rpm speed of the water turbine, wherein the setpoint value of the load moment in a first, power-optimized operating range is established by a state controller and/or a search mechanism for the power maximum; and in a second, power-limited operating range the assigned load moment is chosen so that an operating point distant from the power optimum results for the water turbine.

Abstract: The invention relates to an underwater power plant, comprising a propeller-shaped water turbine in horizontal rotor configuration with a plurality of rotor blades which are fastened to a revolving unit, with each rotor blade being associated with a swivel axis which extends substantially along the respective rotor blade, with the rotor blades being arranged elastically about the swivel axis at least in sections of the longitudinal extension concerning a torsion and/or the fastening of the rotor blades to the revolving unit enabling a rotation of the rotor blades about the swivel axis, and the position of the swivel axis is chosen relative to the profile shape of the rotor blades in such a way that hydrodynamic forces acting during operation on the rotor blade generate a moment which is directed in the feathered pitch position and the centrifugal forces originating during the rotation cause restoring centrifugal moments on the rotor blade against the feathered pitch position.