Wind concentrator

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A wind concentrator is known as a device with which wind is concentrated on the rotor surface of a wind generator (small wind turbine ). Nevertheless, the hurdle given by Betz's law that a maximum of 59 percent of the translational energy contained in the wind can be converted into rotational energy cannot be circumvented.

Delta wing concentrator

The delta wing concentrator is based on the effect of air turbulence and the associated increase in speed. Thus, the rotor can performance increase over a comparable system without concentrator by a factor of 1.7.

Jacket turbine

Flow pattern in a jacket turbine with widening towards the rear; the denser the lines, the faster the flow

A diffuser is built around the rotor and thus the rotor power is increased by a maximum factor of 3.5. Small wind turbines based on this principle are commercially available.

Berwian ( Ber liner Wi ndkraft at position)

At the TU Berlin was in the art of bionics and evolution technique of Ingo Rechenberg developed a wind power installation, the principle of the spread bird wing takes up and in the wind tunnel the generation of 2.7 times wind speed allowed in the actual rotor. In this way, the power output of a small rotor inserted into the concentrated and swirled air flow behind a large number of centrally converging, ring-shaped, stationary blades can be increased by a factor of 8. This result is to be seen relative to the power output in the normal air flow, as it would be achievable with the rotor without this flow-enhancing device. This means that not the entire construction, which is designed many times larger than the rotor as a flow-enhancing device, has an overall eight-fold higher efficiency, but only the much smaller rotor, relative to the normal flow without the concentrator. As a result, a breakthrough in basic research can be assumed here, even if the cost of such a construction does not appear profitable. Such a high concentration of the flow energy through passive guide surfaces had not previously been achieved.

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