The present invention relates to a hydraulic installation where sediment concentration in the water flow circulating through the cited installation is monitored continuously. According to the invention, the hydraulic installation comprises a pressure-reducing device and a primary sensor: the pressure reducing device decreases the pressure and discharge of upstream water flow, comprising sediments, allowing that the primary sensor can operate continuously measuring sediment concentration from the upstream water flow. The hydraulic installation also comprises a calibrating device, providing the primary sensor with a reference value to be used for comparison matters and for establishing the content of sediment in the water flow.

A wind turbine including a generator with a stator and a rotor, a cooling arrangement, a wind turbine brake including a brake disk and a caliper with brake pads is provided. An air duct with a filter is located near the brake pads of the caliper. During the operation of the cooling arrangement, a part of the air flow is guided via the brake pads. The brake dust produced by the brake pads during operation of the brake will be reduced by the filter of the air duct.

Wind turbine blades and wind turbine systems that include a co-flow jet are described. An example wind turbine blade has a main body and a fluid pressurizer. The main body has a first portion, a second portion, a leading edge, a trailing edge, an injection opening, a suction opening, and a channel. The first portion has a first cross-sectional shape and the second portion has a second cross-sectional shape that is different than the first cross-sectional shape. The injection opening is disposed on the first portion between the leading edge and the trailing edge. The channel extends from the suction opening to the injection opening. The fluid pressurizer is disposed within the channel.

An apparatus fixed to a water vehicle to produce electric energy has a turbine rotor supported under the water surface in a horizontal operation position and to it fixed first axis to transfer the rotation motion from the rotor and in which apparatus the rotor has been supported and adapted into with it same centered cylinder that has been fixed to the frame with vertically to it fixed joint that is situated a vertical distance (a) from the rotor and adapted to turn in relation to the frame that has been fixed to the water vehicle round the joint axis and to settle into the direction of the water flow by its power and where the first part of the second axis has been adapted same centered with the joint axis and the first and the second axis have been connected to each other with a rotation movement direction changer when the horizontal rotation of the first axis has been adapted to change into a vertical rotation movement in the first part and the second axis has been connected to a generator to transfer the rotation movement into it and the generator has been connected to a battery to store the generated electric energy to it.

A turbine suitable for micro hydro turbine applications provides a stator with a self-cleaning front edge employing one or a combination of a rotating surface and guillotine cutter, the self-cleaning front edge allowing larger upstream gratings for improved net water flow.