Disclosed is an energy converting apparatus for converting mechanical energy obtained by a fluid flow into electric energy. The energy converting apparatus comprises: a blade; a measuring device for measuring reaction of the blade when the fluid flow exerts an external force on the blade, and generating a measurement value corresponding to a measurement result; a memory for storing control values; a controller for reading a first control value among the control values from the memory in response to the measurement value output from the measuring device, and generating a control signal by using the first control value; and an actuator for changing a three-dimensional shape of the blade in response to the control signal output from the controller.

An arrangement of lifting surfaces including a primary lifting surface having a flexural axis extending in the spanwise direction of the lifting surface, a root, and a tip. A first tip device is attached to the tip and has a first lifting surface. A second tip device is attached to the tip and has a second lifting surface. A control system is coupled to the first and second tip devices for moving the first and second lifting surfaces relative to the tip or for actively controlling circulation of the first and second lifting surfaces. The control system is operable to change a value of torque effective at the primary lifting surface about the flexural axis.

The lengths and/or chords and/or pitches of wind turbine or propeller blades are individually established, so that a first blade can have a length/chord/pitch that is different at a given time to the length/chord/pitch of a second blade to optimize performance and/or to equalize stresses on the system.

The present invention generally relates to runner unit of a tidal power plant, and more particular to a blade of the runner unit. The blade according to the invention provides a maximised efficiency of energy production of the tidal power plant during functioning of both direct and reverse modes.

The lengths and/or chords and/or pitches of wind turbine or propeller blades are individually established, so that a first blade can have a length/chord/pitch that is different at a given time to the length/chord/pitch of a second blade to optimize performance and/or to equalize stresses on the system.

A Kaplan-type turbine includes a stator part and a rotor part; the stator part having a conduit, configured to convey a water flow towards an impeller having a rotation axis, and a stator of an electric generator, while the rotor part includes: an impeller having in turn: an ogive with at least three blades with variable angular setup with respect to an inclination axis substantially orthogonal to the rotation axis; a rotation shaft bearing the impeller; adjustments for adjusting the setup of the blades, defined inside the ogive and the rotation shaft; a rotor of the electric generator, fixed to the rotation shaft. The adjustments for adjusting the setup of the blade include for each blade: a load-bearing disc, from which one blade develops, which load-bearing disc is constrained to rotate on the ogive around the inclination axis; a lever, fixed to the load-bearing disc and developing radially inside the ogive; a manoeuvring rod, pivoted to the lever and to a drive slider.

A method is disclosed for manufacturing a rotating part which belongs to a hydraulic machine of an installation for converting hydraulic energy into electrical or mechanical energy. This rotating part includes blades distributed about an axis of rotation of the rotating part and extending from a leading edge to a trailing edge. This method can include manufacturing, in steel, a first part of each blade, which defines the leading edge thereof, manufacturing a second part of the blade in a material other than steel and attaching this to the first part of the blade so as to form a trailing edge.

A runner vane of an axial hydraulic machine according to embodiments described herein includes a center-side vane part provided on a radial center side and defined by a center-side camber line, and a boss-side vane part provided at a side edge on a side of a runner boss and defined by a boss-side camber line. As determined by the flow direction of a turbine, a curvature of an upstream side portion of the boss-side camber line is larger than a curvature of an upstream side portion of the center-side camber line. An upstream end of the boss-side vane part is positioned on a side of a rotation direction of a runner in comparison with an upstream end of the center-side vane part when viewed toward a downstream side along a rotation axis line of the runner.

The invention relates to a device of a safety system and/or resource and energy-efficiency improvement system for influencing the flow around an aero- or hydrodynamic body, preferably an aerofoil, according to the principle of a back-flow flap, characterized in that: said device, together with the aero- or hydrodynamic body, in particular aerofoil, form at least a partial shift of the delimitation of the flap region by means of the back-flow flap and the delimiting component thereof when the back-flow flap is partially and/or completely raised, thus influencing the trailing edge separation vortex/vortices and/or the flap separation vortex/vortices; and in that the delimitation of the flap region shifts completely up to or beyond the profile trailing edge, or shifts only to a section in front of the profile trailing edge. The delimitation component is movably connected to the aerofoil by means of a basic element and is preferably permanently secured and/or releasably secured for maintenance purposes, thus ensuring a long service life for the rotor blade and/or wind turbine and/or flap system, preferably >5 years, particularly preferably >10 years, and most particularly preferably >=20 years, and/or thus optionally allowing simple removal/replacement.

A Kaplan-type turbine includes a stator part and a rotor part; the stator part having a conduit, configured to convey a water flow towards an impeller having a rotation axis, and a stator of an electric generator, while the rotor part includes: an impeller having in turn: an ogive with at least three blades with variable angular setup with respect to an inclination axis substantially orthogonal to the rotation axis; a rotation shaft bearing the impeller; adjustments for adjusting the setup of the blades, defined inside the ogive and the rotation shaft; a rotor of the electric generator, fixed to the rotation shaft. The adjustments for adjusting the setup of the blade include for each blade: a load-bearing disc, from which one blade develops, which load-bearing disc is constrained to rotate on the ogive around the inclination axis; a lever, fixed to the load-bearing disc and developing radially inside the ogive; a manoeuvring rod, pivoted to the lever and to a drive slider.