Reduction of freestream turbulence at low velocities

Reduction of freestream turbulence at low velocities Controlling freestream turbulence (FST) in low-turbulence wind or water channels is a common challenge and often difficult to achieve. Particularly at low velocities, design guidelines from literature may not fulfill their purpose and thus require alternative strategies. In this study, we propose the installation of a fine-meshed screen downstream of the contraction and not in the settling chamber as typically advised in literature. With this strategy, the lower operational limitation of our facility could be extended below $$U_{\infty }= 0.06\,\text {ms}^{-1}$$ U ∞ = 0.06 ms - 1 and the turbulence intensity reduced by $$60 \%$$ 60 % at 0.04 ms $$^{-1}$$ - 1 . This is not only an improvement of freestream conditions but also the key to experiments in the laminar boundary layer, which is highly sensitive to FST. In fact, two fundamentally different transition mechanism can be distinguished with this approach. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Reduction of freestream turbulence at low velocities

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2017 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-017-2333-y
Publisher site
See Article on Publisher Site

Abstract

Controlling freestream turbulence (FST) in low-turbulence wind or water channels is a common challenge and often difficult to achieve. Particularly at low velocities, design guidelines from literature may not fulfill their purpose and thus require alternative strategies. In this study, we propose the installation of a fine-meshed screen downstream of the contraction and not in the settling chamber as typically advised in literature. With this strategy, the lower operational limitation of our facility could be extended below $$U_{\infty }= 0.06\,\text {ms}^{-1}$$ U ∞ = 0.06 ms - 1 and the turbulence intensity reduced by $$60 \%$$ 60 % at 0.04 ms $$^{-1}$$ - 1 . This is not only an improvement of freestream conditions but also the key to experiments in the laminar boundary layer, which is highly sensitive to FST. In fact, two fundamentally different transition mechanism can be distinguished with this approach.

Journal

Experiments in FluidsSpringer Journals

Published: Apr 3, 2017

References

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