The present invention relates to a wind turbine blade (10) comprising two or more serrations (100a, 100b, 100c) provided along a section (S) of the trailing edge (20). The section (S) extends spanwise from the tip end (14) towards the root end (16) for up to 5% of the total blade length (L), The serration (100a) closest to the tip end has a height (H) and/or width (W) greater than the respective height (H) and/or width (W) of at least one other serration (100b, 100c) in said section. The present invention also relates to a wind turbine (2) comprising at least one wind turbine blade (10) of the present invention and to a serrated panel (66).

A wind turbine blade assembly is described. The wind turbine blade assembly comprises: first and second blade sections connected together, each blade section having a shell defining an aerodynamic profile and each section comprising lightning protection components; a substantially enclosed interior region defined in part by the shell of the first blade section and in part by the shell of the second blade section; a first connector located in the interior region, the first connector being attached to the first blade section and electrically connected to the lightning protection components of the first blade section, the first connector defining a contact surface; a second connector located in the interior region, the second connector being attached to the second blade section and electrically connected to the lightning protection components of the second blade section, the second connector defining a contact surface opposed to and in contact with the contact surface of the first connector. The wind turbine blade assembly further comprises a first fastener extending through the shell of the first blade section into the interior region, the first fastener having a threaded shank that extends at least partially through the first and second connectors, and the first fastener clamps the contact surfaces of the first and second connectors together to form a torqued connection between the first and second connectors.

A particular arrangement of vortex generators for an airfoil is described. The vortex generators are provided in pairs, preferably on a wind turbine blade, wherein by arranging the vortex generators according to specified characteristics, a surprising improvement in blade performance is provided over the prior art systems.

A rotor blade having a suction side and a pressure side for a wind power installation, comprising: a rotor blade root of a hub region for the attachment of the rotor blade to a rotor hub, and a rotor blade tip arranged toward that side of a tip region which is averted from the rotor blade root. In the region of the hub region, the rotor blade has, at least in part, a thickness profile which has a thorn-like extension at its trailing edge, wherein, in the region of the hub region, the thickness profile has, at least in part, a first thorn-like extension at the trailing edge at the suction side, and a second thorn-like extension at the trailing edge at the pressure side, and, in the region of the hub region, the thickness profile has, at least in part, a flow stabilizer and/or a vortex generator on the suction and/or pressure side.

The blades of conventional wind turbines almost always have adjustable pitch; that is, they can be pivoted about their length in order to change the angle of attack of the blades to the wind. This is necessary, because the effective angle of attack varies with both wind speed and rotational speed. In particular, in extremely high wind speeds, the blades can be ‘feathered’ to reduce the amount of torque being imparted to the turbine. The present invention provides a wind turbine in which pressurised air may be conveyed to air outlets 21 on the blades 1. In this way, the aerodynamic behaviour of the blade 1 may be controlled, effectively feathering the blade without needing a robust mechanical system for pivoting the blade.

Provided is a trailing edge assembly of a wind turbine rotor blade, which includes a mounting portion; a flap portion flexibly connected to the mounting portion so that a flap angle subtended between the mounting portion and the flap portion can be altered; a volume adjustable chamber arranged between the mounting portion and the flap portion and realised to alter its volume between a minimum volume associated with a minimum flap angle and a maximum volume associated with a maximum flap angle; and at least one tube to face into an airflow passing over the airfoil region of the rotor blade, and an inner orifice arranged to face into the interior of the volume adjustable chamber such that an airflow between the outer orifice and the inner orifice alters the volume of the volume adjustable chamber. Embodiments of the invention further describe a wind turbine rotor blade.

An impeller design is provided for use in evaporating water from an ambient water body. The impeller includes a hub and a plurality of impeller blades. The blades have one or more profiles that correspond to certain profiles characterized by the National Advisory Committed for Aeronautics parameters known as NACA 4 parameters. One or more blade angles also may more specifically identify the blade profiles. The impeller blades also may be identified by a plurality of profiles on a given blade, preferably including a base profile and a tip profile. The impeller optionally but preferably is made of a fiberglass material. In preferred embodiments it constitutes an integrated unit, such as a unitary molded or cast unit. It may be coated by a suitable corrosion-resistant coating, for example, such as a clear coat or gel coat. Various features of the impeller hub also are disclosed. An impeller system also is disclosed. The system includes an impeller as described above and means for mitigating non-longitudinal flow in the air flow channel in which the impeller caused air movement. The means for mitigating non-longitudinal flow preferably includes a plurality of guide vanes disposed downstream of the impeller.

A ceiling fan or similar air-moving device can include a motor for rotating one or more blades to drive a volume of air about a space. The blade can include a body having an outer surface with a flat top surface and a flat bottom surface, and a side edge. A curved transition can extend between one of the flat top surface or the flat bottom surface, and the side edge. The curved transition can include an elliptical curvature.

This invention relates to an airfoil modifying device, a wind turbine blade and a method of modifying an airfoil profile of the wind turbine blade. The airfoil modifying device comprises a deformable element connected to a filler element, both configured to deform between a retracted position and an extended position. The airfoil modifying device is passively deformed by the local air pressure acting on the blade surface and thus the airfoil modifying device.

An evaporator is provided for evaporating water from an ambient water body. The evaporator includes a housing that in turn includes an air flow channel and an air flow exit. The evaporator also includes an air flow induction device, such as a fan or impeller, that facilitates the directing of an air flow stream through the air flow channel and out the air flow exit. A water injection device is in fluid communication with the air flow channel and is disposed to inject the water from the water body into the air flow stream at a water injection location within the air flow stream and proximate to the air flow exit. A water injection system for injecting water from an ambient water body into an air flow stream directed by an air flow channel of an evaporator also is disclosed, wherein the air flow channel is disposed about a longitudinal axis. The water injection system includes an elongated tubular member disposed parallel with respect to the longitudinal axis, a plurality of water injection nodes disposed at the tubular member and spaced from one another longitudinally, and a support for positioning the elongated tubular member within or proximate to the air flow channel so that the plurality of water injection nodes are positioned within the air flow stream.