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The wind turbine with a contour tracer

(Patents applied P/1/19979)

The wind turbine with a contour tracer supersedes horizontal axis wind turbine (HAWT) by ability to deliver higher power for a selected cross section, By reducing the manufacturing cost to 1/10th compared to HAWT, ability to manufacture at site itself without sophisticated part and simplicity in maintenance.

The author is able to design and build an amazing vertical axis wind turbine that can deliver higher power than horizontal axis wind power generator.

This wind turbine with a contour tracer is having turbine blades spinning around their own axis while orbiting around the central shaft vertically positioned on a horizontal rigid basement. A pair of hubs is mounted on bearings to the central shaft, positioned apart, over the central shaft to hold the a symmetrically positioned plurality of extended arms forming rotor framework outwards around the central shaft. Each turbine blade is integrated with an extension of shaft projected down words supported on pivots located on said extended arms of the said rotor framework.

Down side of each turbine shaft is fitted with a crank arm, providing leverage to hold a roller to paddle along the track set on a horizontal platform disposed above the basement.

The crank arm is designed in such a manner that the rear side of the rank arm is extended backwards so that a peg positioned on the platform , be impelled on the rear extension of the crank arm in order to turn the turbine on desired direction at the end of power stroke.

A horizontal platform is having over the basement and it is drivable on bearings fitted to central shaft in order to adjust its orientation to face the turbine blades along desired direction.

In operation, working cycle of each turbine blade is having a power stroke and a return stroke. During power stroke turbine blades are turned perpendicular to the direction of streaming wind whereas during the return stroke turbine blades are turned along the direction of wind. Concurrently, the turbine shafts are rotating about the central shaft, while the turbine blades turning around the own axis.

The turbine blade direction is controlled by the contour traced by the roller during power stroke.
In operation, the said roller engage with the contour track and paddle between two guide walls of contour track, thereby turning the surface of the turbine blade perpendicular to wind direction and maintaining its direction during the first half circle of movement of the turbine blade. When the turbine blade moves to the extreme end, the contour track releases engagement of the roller thereby allows the turbine blade move freely. Then the turbine blade turns along streaming wind direction and produce minimum air resistance during its return stroke until it propel back on the other way round to the starting position. Thus another cycle continues by the roller engagement with the contour track.

The turning movement of the rotor geared to electricity power generator to produce usable electricity.
Further, a break system and controls are accompanied to stop or reduce the rotational speed of the rotor and turbine blades.
For best performance number of turbine blades should be two or three.
This wind turbine is low cost high efficient easy to assemble and build product. Its blades cover much larger area than a circular profile of the space of streaming wind. Power generator and control equipment are installed on ground level and reduces maintenance cost procedures. It can build to greater height.

The turbine blades are having flat surface, sothat the cost of manufacturing turbine blades and transporting them to instaling ground has become economical.

Impulse turbines change the direction of flow of fluid stream. In reaction turbines air flow pass through the moving blades. Betz law applies for the wind flow that passes through a reaction turbine. But this wind turbine behave as an impulse turbine.

A guide parth for crank pin can be designed for the complete revolution. (You may note that the crank arm is able to turn at desired direction when the turbine blade moves to the extreme end, the rear side of the rank arm is extended backwards so that a peg positioned on the platform , be impelled on the rear extension of the crank arm in order to turn the turbine blade on desired direction at the end of power stroke.)

Further the direction of each turbine blade can control by servomotors or stepper motors with or without using the guide path.

Power generating ability compared to horizontal axis wind turbine is analyzed here

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For more details Contact : Leelananda Jayasuriya

E-mail  : leel6391@yahool.com

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