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The wind turbine with a contour tracer

(Patents applied P/1/19979) - The Inspiration of Lateral axis wind turbine

Impulse tubine for wind power generation

Inspired by lateral axis wind turbine 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.

The 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, at top and bottom of the said central shaft. A symmetrically positioned plurality of extended arms extended outwards around the central shaft, forming a rotor framework. 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.
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.
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.
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.
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 bracket of the rotatable secondary 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.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.

As a summary this is a vertical axis wind turbine, absent from control tracks overhead of the wind tower, that comprises a central shaft mounted vertically on a rigid basement; with a pair of hubs secured on bearings to said central shaft; while aforesaid two hubs having a symmetrically located plurality of arms extended radially outwards, forming a rotor frame; with a plurality of turbine blades fitted on vertically held turbine shafts and pivoted on bearings between each pair said extended arms to orbit around central shaft; characterized by each aforesaid turbine shafts connect rigidly with a crank lever arm on each at the bottom end of said turbine shafts; while rollers to be secured at the end of each crank arm, so that the said each roller dwell the contour track formed on a horizontal table during power stroke, thereby the direction of each turbine blade to be controlled by the engagement of rollers in the contour track formed on the said horizontal table, while having means for gear arrangement to connect said bottom hub to an electricity generator thereby the rotary motion of the bottom hub be able to transfer power as consumable electricity, during operation, when the streaming wind impel on turbine blades, in order to undergo a change of orientation of said wind turbine blade, during each cycle of rotation around central shaft, and coming back to their original position after each revolution so that the motion of the rotor be able to take up by electricity generator.

Impulse turbines change the direction of flow of a fluid. In reaction turbines air flow pass through the moving blades. Betz law applies for the wind flow that passes through the turbine. This wind terbine is an impulse turbine. Power generating ability compared to horzontal axis wind turbine is analysed here

The lateral axis wind turbine

(Sri Lanka Patent 17981)

The lateral axis wind turbine delivers breakthrough clean energy technology

It differ from horizontal axis wind turbine and vertical axis wind turbine for having its central shaft mounted horizontally on upright supports while turbine blades spin on extended arms around the central shaft.

How lateral axis wind turbine works:

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The illustration shown below is the behavior of ONE TURBINR BALADE during a complete cycle

This Wind Turbine design could potentially generate 20 Megawatts in commercial scale. It can turn by rainfall and snowfall as well.

This design doesn't involve complicated manufacture. Therefore it can fabricate with scraps and locally available materials.

Turbine control is used for efficient performance and for low maintenance costs. Further it helps safe operation, structural stability and optimum output. The yaw system can align the wind turbine in parallel with wind direction.
Different control strategies may be applied for yaw control.
A passive yaw control systems is applied using the wind force to turn the rotor towards the wind. An active yaw system also could be applied to a commercial scale large wind turbines.

According to their rotor layout, presently known wind turbines are categorized into horizontal-axis wind turbines (HAWT) and vertical-axis wind turbines (VAWT).
The rotor of a HAWT is horizontal and must point to the wind. The rotating plane of HAWT blades is perpendicular to the wind direction during operation. The turbine blades are radial and their number is varies 2 to a higher value. Most efficient designs use 2 or 3 turbine blades. Yaw control device has to accompany HAWT.
The shaft of a VAWT is perpendicular to the ground and the wind direction. VAWT accepts the wind from all horizontal directions; there is no need of a yaw control devices.
Although both designs require a large area acquiring large ground space amount of energy that can utilize is small. This is because the exposed turbine blade area according to design conditions has to limit to a small fraction of the swept area.
This problem has overcome by the present invention by turning the blades in a lateral direction of the blowing wind, while leaving the blades to face full force of the wind.

Wind turbine Installation