Power law according to Hellmann

With the help of Hellmann's power law , the wind speed at any height can be approximately determined based on a measured wind speed at a certain height. It is named after the German Gustav Hellmann (1854–1939).

definition

${\displaystyle {\overline {v}}_{2}=v_{1}\cdot \left({\frac {h_{2}}{h_{1}}}\right)^{\alpha }}$

${\displaystyle h_{1}\!\,=}$Height 1 Height 2 Wind speed at height 1 Mean wind speed at height 2 Wind exponent in altitude (under normal conditions = 0.14)
${\displaystyle h_{2}\!\,=}$
${\displaystyle v_{1}\!\,=}$
${\displaystyle {\overline {v}}_{2}\!\,=}$
${\displaystyle \alpha \!\,=}$

Web links

• Wind shear - information from the Bundesverband Windenergie eV

literature

• Siegfried Heier : Wind power plant system design, grid integration and control. Teubner Verlag, Wiesbaden 2005, ISBN 3-519-36171-X