Wind turbine

a wind turbine and wind power technology, applied in the direction of liquid fuel engines, renewable energy generation, greenhouse gas reduction, etc., can solve the problems of reducing the power output and energy conversion efficiency of vertical wind turbines, affecting the torque of vertical turbine blades, and rotating down

Inactive Publication Date: 2013-08-01
POOLE THOMAS BERSTREETCAR
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One difficulty with vertical rotating blades is that about half of the blades are driving the turbine at any time whereas the opposite half or “dead” blades slow the rotation down due to drag.
This drag can significantly reduce the power output and energy conversion efficiency of vertical wind turbines.
Another difficulty is that the torque on a vertical turbine blade can be compromised in that at low wind speeds it may not take much load to stop the turbine from turning while at high speeds the rotational velocity of a load-uncompensated turbine can become very high causing instability and excessive vibration.
Even at high speeds the angular momentum of an uncompensated turbine can be insufficient to maintain an even speed when load is applied.

Method used

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Embodiment Construction

[0023]Reference is now made to FIGS. 1A-1C of the accompanying drawings which show a vertical axis wind turbine system 100 that converts wind energy into electrical or mechanical energy. Use of the word “vertical” in this specification is not intended to limit the application of the disclosure. Horizontally disposed wind turbine systems, or “vertical”-type turbines having an axis of rotation disposed at any inclined angle are within the scope of this disclosure.

[0024]The turbine system 100 comprises at least one turbine rotor 102A which has a plurality of curved blades 104 for receiving head-on wind generated airflow, as shown by arrows A in FIG. 1A. In the illustrated embodiment, two turbine rotors 102A and 102B are shown but the system could have three or more such rotors. In other embodiments, the blades could be straight or planar, relatively thick or thin in sectional thickness, and with or without a leading or trailing edge. Any blade or foil that works to drive a vertical-typ...

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Abstract

A vertical axis wind turbine system is provided that converts wind enemy into electrical or mechanical enemy. The turbine comprises at least one turbine rotor with a plurality of curved blades for receiving head-on wind generated airflow. Shield means mountable around at least a portion of the rotor serve to protect the upstream-moving blades from head-on wind airflow and thereby reduce drag. In one embodiment, load compensation means are provided to adjust the moment of inertia of the turbine rotor. One or more of the turbine rotor blades is hollow and defines a closed volume for holding a fluid, the fluid being displaceable in use through baffle means towards or away from the vertical axis of the rotor as the rotational velocity of the rotor changes.

Description

TECHNICAL FIELD[0001]An example embodiment of the invention pertains generally to a vertical wind turbine system having wind shield means for reducing drag on the non-driving (return) blades of the turbine imposed by the oncoming wind. Another example embodiment relates to a wind turbine system with load compensation means.BACKGROUND[0002]Various wind turbines and air screws for the generation of electricity have been proposed. The present disclosure relates to a vertical axis type of air turbine, more commonly known as a “vertical” wind turbine. One difficulty with vertical rotating blades is that about half of the blades are driving the turbine at any time whereas the opposite half or “dead” blades slow the rotation down due to drag. These dead or non-driving blades are return blades trying to move upwind during part of their rotational cycle against the direction of the prevailing wind. This drag can significantly reduce the power output and energy conversion efficiency of vertic...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F03D3/04
CPCF03D7/06F03D3/0445F05B2240/40F03D3/04F05B2240/913Y02E10/74Y02E10/728F05B2240/911F03D3/02F03D9/25F03D13/20
Inventor POOLE, THOMAS BERTRAM
Owner POOLE THOMAS BERSTREETCAR
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