A fluid-turbine system has an improved means of mitigating the effects of excessive fluid velocity on turbine structural components. Spoilers provide a simple mechanical solution that reduces lift, with minimal increase in drag. Spoilers installed on a duct control aerodynamic lift on ducted turbines, specifically in high-wind conditions. An example embodiment comprises a ducted (shrouded) turbine with articulated segments or spoilers, which may be raised toward the central axis. These spoilers reduce or maintain a tower base moment as constant and dampen support structure oscillations.

Apportioned segments from the surface of a duct in a ducted turbine may be articulated to reduce the surface area of the duct. The apportioned segments are employed to reduce the surface area and therefore the wind resistance of the duct, in excessive wind conditions where excessive side loads are exerted upon the ducted turbine.

An apparatus and method for designing a diffuser-augmented wind turbine with significantly reduced time-averaged loads and significantly reduced dynamic amplification factors. Some embodiments have an annular airfoil in fluid communication with the circumference of a rotor plane, and a vertical surface with a substantially symmetrical aerodynamic form with an articulated portion.

An apparatus and method for designing a diffuser-augmented wind turbine with significantly reduced time-averaged loads and significantly reduced dynamic amplification factors. Some embodiments have an annular airfoil in fluid communication with the circumference of a rotor plane, and a vertical surface with a substantially symmetrical aerodynamic form with an articulated portion.

The present invention generally relates to the field of energy generation systems-renewable energywind energy and flowing water energy, more particularly to the fluid turbines. The present invention uses the blockage effect either due to a plate or due to a ground suitably place so that in a distance up to one diameter away from the duct, so that the air is deflected up to 90 degrees and beyond and the flow rate through the duct and turbine is increased, leading to higher efficiency and greater power produced.

The present disclosure relates to a shrouded fluid turbine comprising: a turbine shroud surrounding a rotor and an ejector shroud in fluid communication with the trailing edge of the turbine shroud. Further disclosed is a method and apparatus having a unique configuration that provides a means of mitigating loads on structural components. An example embodiment includes the use of the electrical generation equipment as a counterweight. Other embodiments may include axial motion of components to reduce the moment arm of heavy components and to reduce fluid-stream thrust-force on the support structure and a means of controlling the mean-turbine power production in an array of turbines by controlling downstream wake vortices and power output of an upstream turbine while increasing the free-stream flow to, and power output of, a downstream turbine.

A fluid-turbine system, method and apparatus optimizes wind-turbine performance by use of sensors embedded on a shroud and/or ejector shroud. The sensors monitor visible or audible movement, vibration, acoustic waves or temperature. A combination of sensors and monitoring means comprises a method for preventing or mitigating the negative effects of dormant failure.

A fluid-driven power generation unit, may include two sets of airfoils disposed on opposite sides of the power generation unit with their leading edges facing a windward end of the power generation unit; a body element having a curved front face and a back disposed, wherein at least a portion of the elongate body element is disposed between the first and second set of airfoils; and a power generation unit disposed in alignment with the body element, the power generation unit including at least a housing, and a turbine and an electrical generation unit actuated by the turbine disposed within the housing. As a fluid flows across the airfoils, the lifting force of the airfoils causes a reduced pressure within the power generation unit, drawing air past the turbine, through the body element and out the back of the body element, thereby extracting power from this secondary fluid flow stream.