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Article | REF: BE8584 V1

The physics of windmills

Author: Hervé NIFENECKER

Publication date: October 10, 2018, Review date: November 30, 2018 | Lire en français

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    1. The power of the wind

    Consider a moving air mass with velocity V . A volume of air of length L parallel to the direction of the wind and of area S is characterised by:

    • a linear momentum SLρV ;

    • a kinetic energy of 1/2 SLρV   2 where ρ is the density of the air.

    To calculate the power passing over an area S perpendicular to the direction of the wind we can say L  =  V . Therefore the power of...

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