摘要:
The present disclosure relates to a fluid turbine including a rotor and one or more ringed airfoil segments in fluid communication with a wake of the rotor. Each of the ringed airfoil segments includes a leading edge positioned co-planar with or downstream of the rotor plane as measured along the central axis. The ringed airfoil segments may include associated mixing elements. The fluid turbine may include a second ringed airfoil downstream of the one or more ringed airfoil segments.
摘要:
One or more variable pitch airfoils in fluid communication with a rotor of a fluid turbine can control the amount of energy directed to the rotor, and further control the amount of energy generated by the turbine. Varying the pitch of the airfoils may provide a means of controlling the power output of a fluid turbine without the need to control the pitch of the rotor blades, and may further provide a means of mitigating the effects of wind shear on the rotor. Variable pitch airfoils may also include a means of controlling the active power, reactive power and SCADA, of a group of fluid turbines.
摘要:
The present disclosure relates to fluid turbines having a turbine shroud assembly formed with mixing elements (e.g., both inwardly and outwardly curving elements) having airfoil cross sections. These airfoils form ringed airfoil shapes that provide a means of controlling the flow of fluid over the rotor assembly or over portions of the rotor assembly. The fluid dynamic performance of the ringed airfoils directly affects the performance of the turbine rotor assembly. The mass and surface area of the shrouds result in load forces on support structures. By delaying or eliminating the separation of the boundary layer over the ringed airfoils, boundary layer energizing members (e.g., vortex generators, flow control ports) on the ringed airfoils increase the power output of the fluid turbine system and allow for relatively shorter chord-length airfoil cross sections and therefore reduced mass and surface area of the shroud assemblies.
摘要:
A ring airfoil with a voluminous leading edge region, an intermediate region, a trailing edge region including a flap. The ringed structural leading edge region combined with a rigid trailing edge region having intermediate discrete support portions extending therebetween provides sufficient rigidity to support the flap on the trailing edge region while using a membrane intermediate surface to form a portion of the intermediate region of the airfoil.
摘要:
Shrouded fluid turbines having features for setting, adjusting or controlling a blade tip-shroud clearance are described. Also described are methods for setting, adjusting or controlling a blade tip-shroud clearance in a shrouded fluid turbine.
摘要:
Systems and methods for maintaining the active power production of a fluid turbine and regulating the temperature of an electrical generating component by controlling the reactive power production are disclosed. A thermal parameter of the electrical generating component is monitored. If the electrical generating component exceeds a thermal parameter the reactive power production of the turbine is reduced. A fluid turbine may be de-rated to further reduce an electrical generating component's thermal parameter. A fluid turbine may shut down to further reduce an electrical generating component's thermal parameter. A fluid turbine's power production is re-started when the electrical generating component returns to an acceptable thermal parameter.
摘要:
A shrouded fluid turbine includes a support structure, a nacelle body rotationally coupled to the support structure and configured to pivot about a pivot axis passing through the support structure, a rotor coupled to the nacelle body and having a rotor plane passing therethrough, the rotor plane being offset from the pivot axis, and an aerodynamically contoured turbine shroud surrounding the rotor and having a leading edge, a trailing edge and a plurality of mixing elements disposed therein. A center of pressure may be located downstream of the rotor plane with respect to direction of a fluid flow, and a combination of the nacelle body, the rotor, and the aerodynamically contoured turbine shroud may be configured to pivot about the pivot axis in response to a force exerted on the combination by the fluid flow such that the leading edge faces into the direction of the fluid flow.
摘要:
A shrouded fluid turbine includes a ringed airfoil having a leading edge, a trailing edge, an outer surface, an inner surface, and a body extending from the leading edge to the trailing edge. The shrouded turbine further includes a rotor surrounded by the ringed airfoil. The rotor is disposed downstream of the leading edge and about a central axis of the fluid turbine. The shrouded turbine further includes an aperture extending through the body of the ringed airfoil between the outer surface and the inner surface. The aperture is configured to mix a first fluid flow adjacent to the outer surface of the ringed airfoil and a second fluid flow downstream of the rotor.
摘要:
A ring fluid foil including a modified trailing portion for a shrouded fluid turbine and shrouded fluid turbine including such ring fluid foils are described herein. The modification of the trailing portion increases flow turning by the fluid foil without, or with reduced, boundary layer separation on a suction side of the fluid foil.
摘要:
Example embodiments are directed to fluid turbines that include a turbine shroud, a rotor and an ejector shroud. The turbine shroud includes an inlet, an outlet, a leading edge and a trialing edge. The leading edge of the turbine shroud can be round and the trialing edge of the turbine shroud can include linear faceted segments. The rotor can be disposed within the turbine shroud and can define a rotor plane. The turbine shroud can provide a first portion of a fluid stream to the rotor plane via the inlet of the turbine shroud. The ejector shroud can provide a second portion of the fluid stream to the outlet of the turbine shroud via an open area. An example method of operating a fluid turbine is also provided.