摘要:
A wind turbine rotor blade (1) with a suction side (13) and a pressure side (15) is provided. It comprises a cylindrical root portion (3) an airfoil portion (5) defining the suction side (13) and the pressure side (15), and a transition portion (7) which is located between the airfoil portion (5) and the root portion (3). The transition portion (7) has a transition profile changing from the airfoil of the airfoil portion (5) to the cylindrical profile of the root portion (3). The leading section of the transition profile is cylindrical and the trailing section of the transition profile is elongated. In the rotor blade, the maximum chord length of the airfoil portion (5) is at least the maximum chord length of the transition portion (7). In addition, the transition profile comprises a section with a concave curvature (25) on the pressure side (15) of the rotor blade (1).
摘要:
A wind power device comprises a wind guide and a twisted member in the wind guide. The wind guide is rotatable around a vertical shaft so that a front opening of the wind guide may always face the wind. The wind which comes into the wind guide is guided around the twisted member and reaches to a blade wheel, which actuates a generator via gears to create electric power.
摘要:
A vane assembly, particularly suitable for a transverse flow, or vertical axis, turbine or a propulsion device comprises: avane with at least one concavo-convex part that is mounted by a pivot about so that it is free to rotate about a pivot axis. The pivot may connect the vane to a rotor with an axis of rotation, the pivot axis being inclined to the concave face such that, as the rotor turns, the vane is free to rotate about the pivot axis between a first position in which the vane defines a high-drag configuration for retreating with a transverse fluid flow, and a second position in which the vane defines a reduced-drag configuration for advancing against the transverse fluid flow.
摘要:
A vertical axis wind turbine comprises a symmetric aerofoil having a concavely curved tail portion defining a trailing edge angle of between 0° and 5° on either side of the chord, a maximum thickness centre point between 26% and 34% of the length of the chord from the leading edge, a leading edge curvature ratio (D1/D2) from 0.42 to 0.50, and a ratio of maximum thickness to chord length T/C from 0.12 to 0.19, preferably 0.16. Advantageously the rotor may have helical blades defining a cylindrical swept envelope with a positive angle of attack and a solidity ratio NC/D from 0.125 to 0.270, and is governed at a tip speed ratio from 2.25 to 4.00.
摘要:
The invention relates to a Francis runner (200) for a hydraulic machine, comprising: a wheel (1), which is rotationally symmetrical about an axis of rotation (Z) of the runner (200); a crown (12); and a plurality of inwardly curved vanes (21), each of which has a peripheral edge (212). The peripheral edge (212) of at least one of the vanes is curved, the concavity thereof facing toward the outside of the runner (200). The maximum value of the distance measured between any point on the peripheral edge (202) and a straight line passing through a first connection point between the peripheral edge (212) and the wheel (1), and through a second connection point between the peripheral edge (212) and the crown (12), is at an intermediate point on the peripheral edge (212). The radius (Rn) from the intermediate point (N) is strictly smaller than the radius (Ra) from the first connection point (A). The radius (Rn) from the intermediate point (N) is strictly smaller than the radius (Rc) from the second connection point (C).
摘要:
A blade (1) for a wind turbine rotor having a substantially horizontal rotor shaft, said ro¬ tor comprising a hub, comprises, seen in longitudinal direction along a longitudinal axis (10), a root area (2) closest to the hub, an airfoil area (4) furthest away from the hub and a transition area (3) between the root area (2) and the airfoil area (4). Seen in transverse direction, the blade (1) comprises a leading edge (5) and a trailing edge (6) as well as a chord plane (K) extending between the leading edge (5) and the trailing edge (6) of the blade (1). A surface zone with a plurality of indentations (7) and/or pro¬ jections is provided in at least the root area (2), said indentations and/or projections be¬ ing formed and dimensioned to improve the wind flow across the surface of the blade (1).
摘要:
The invention relates to a device for collecting swell energy, that comprises a float (2), a turbine (8) mounted under the float and adapted for moving relative to the float when the float is moved by the swell, and a power generator (15) driven by the turbine. The turbine is rotatingly mounted about a vertical rotation axis (X), said turbine being adapted so that a tilting motion of the float always results in a torque applied onto the turbine in a single predetermined rotation direction.