The invention relates to a continuous-flow energy installation, in particular a wind power installation, having an at least approximately drop-shaped housing, from the inlet opening of which to the outlet opening the flow channel delimited by the channel wall extends. The propeller is mounted rotatably about the longitudinal axis and fluid flowing through the flow channel, flows axially onto the propeller. The axial position of the propeller can be varied by means of the spacing adjustment drive. Alternatively or additionally the channel wall is variable. The length of the flow channel is, for example, adjustable by means of the length adjustment drive. These variation possibilities make it possible to adapt the energy generation by means of the generator to changed conditions of the fluid stream, in particular the wind.

A hydroelectric energy system includes a stator comprising a first plurality of electricity-generating elements. The system also includes a rotor comprising a second plurality of electricity-generating elements. The rotor is disposed radially outward of an outer circumferential surface of the stator and is configured to rotate around the stator about an axis of rotation. The rotor is a flexible belt structure having a variable thickness and extending along a portion of an axial length of the stator. The system further includes at least one hydrodynamic bearing mechanism configured to support the rotor relative to the stator during rotation of the rotor around the stator. The at least one hydrodynamic bearing mechanism includes a bearing surface made of wood or a composite material.

An energy generating system for transforming energy of fluid flow into electric energy, the system, at least in operation, comprising: a flow-changing member having a peripheral rim and mounted in a fluid path having a path surface, so as to be at least partially surrounded by said path surface, said flow-changing member being displaceable between a first position, in which at least a portion of the rim is spaced from a corresponding portion of the path surface to a first extent and a second position, in which said portion of the rim is spaced from said portion of the fluid path surface to a second extent greater than said first extent, so that increase of total volumetric flow rate of said fluid above a predetermined threshold to an increased volumetric flow rate is configured to induce displacement of said flow-changing member from said first position toward said second position, thereby causing the volumetric flow rate of said fluid at said spacing to be above said increased volumetric flow rate; and a turbine mounted in fluid communication with said fluid path at a location other than said spacing, whereby said displacement causes the volumetric flow rate of said fluid at said turbine to be below said increased volumetric flow rate.

Described herein are wave energy conversion systems including actuated geometry components. An example system may include at least one body portion configured to transfer wave energy to a power take off device, and at least one actuated geometry component that is connected to the at least one body portion, the at least one actuated geometry component operable to modify a geometric profile of the system.

A method and apparatus according to which an output of a power generation system is controlled. In one embodiment, the power generation system includes a turbine and a feedback control system. The turbine includes a rotor to which a first portion of a power fluid is communicated, the first portion imparting torque to the rotor; a shaft to which the rotor is connected; a shroud extending circumferentially about the rotor and the shaft; and a bypass gap between the rotor and the shroud, through which a second portion of the power fluid is communicated. The feedback control system axially displaces the shroud relative to the rotor, thereby adjusting the size of the bypass gap and, consequently, the ratio of the first portion relative to the second portion.

A two-body wave energy converter (WEC) that utilizes components in the two bodies having variable geometry is described. The WEC includes a surface control body which includes a first variable geometry component, and a reaction control body, which includes a second variable geometry component. During operating, the two variable geometry components may be substantially inflated to enable the WEC to generate electrical energy using power-take off (PTO) components or substantially deflated to allow for load shedding or protection from intense elements.

An air boost system for a two-cycle engine, such as an EMD engine, which operates with a gear-driven turbo-supercharger. The turbo-supercharger is undersized for the engine, such that it is insufficient to provide air flow for a target air-fuel ratio above a pre-determined mid-load threshold. An additional turbocharger is installed in parallel with the turbo-supercharger, such that the intake manifold may receive air intake from only the turbo-supercharger or from both the turbo-supercharger and the turbocharger. In operation, the turbocharger is active only at loads above the predetermined load threshold.

Apparatus for extracting energy from an oscillating working fluid, the apparatus comprising a flow passage 40 for the oscillating working fluid, an energy conversion unit 44 and a flow control device 38, each of the energy conversion unit 44 and the flow control device 38 being, at least in part, in fluid communication with the flow passage 40, wherein in use the flow control device 38 is selectively operable between a first configuration in which the flow control device 38 is open to allow a flow of the oscillating working fluid to exit the flow passage therethrough, and a second configuration in which the flow control device 38 is arranged to restrict a flow of the working fluid therethrough, such that the oscillating working fluid enters the flow passage via the energy conversion unit 44.

A hydraulic water wheel assembly and system where optimum results are obtained based upon factors such as the height of the channel, the distance between water wheels, the diameter of the discs, and the number, size, dimensions, and arrangement of the wing blades.

This invention relates to an arrangement for a surface area adjustment of a reciprocating wing system in a wave energy recovery system where the wave energy recovery system comprises at least a body, a set of wings fastened to a support means that is hinged at its lower ends onto the body to make a reciprocating motion in response to kinetic energy of waves or tidal currents, and a power-take-off means. The arrangement comprises at least adjustment means capable to adjust the total effective surface area of the wings.