Atmospheric wind field conditions generated by active grids |
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Authors: | Pascal Knebel Achim Kittel Joachim Peinke |
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Institution: | 1.ForWind Center for Wind Energy Research, Institute of Physics,Carl-von-Ossietzky Universit?t Oldenburg,Oldenburg,Germany;2.Institute of Physics,Carl-von-Ossietzky Universit?t Oldenburg,Oldenburg,Germany |
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Abstract: | An active grid for turbulence generation of several rotatable axes with surmounted vanes that can be driven via stepper or
servo motors is presented. We investigate the impact of different excitation protocols for the grid. Using such protocols
that already have the intermittent structure of turbulence, higher intermittent flows can be achieved. This concept can also
be used to generate turbulent flows of high turbulence intensities (>25%) exhibiting integral length scales beyond the typical
size of the test section of the wind tunnel. Similar two-point correlations measured by the intermittent statistics of velocity
increments that are characteristic for flows of high Reynolds number, i.e. in the atmospheric boundary layer, can be reproduced. |
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