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A note on wind-tunnel turbulence measurements with DPIV

Spedding, G. R.; Hedenström, Anders LU and Johansson, Christoffer LU (2009) In Experiments in Fluids 46(3). p.527-537
Abstract
At moderate Reynolds numbers (10(4) a parts per thousand currency sign Re a parts per thousand currency sign 10(5)), the performance of lifting surfaces is strongly affected by the potential for laminar boundary layer separation and subsequent reattachment and the use of high-quality, low-turbulence wind tunnels is essential in characterising flight at comparatively small scales (where the wing chord may be from 1 to 5 cm in length) and low speeds (on the order of 10 m/s). Measurement of the existing turbulence levels in such facilities is hard and has not been achieved using DPIV methods due to the relatively small bandwidth of measurable velocities. A series of experiments is reported here where DPIV sampling parameters are driven beyond... (More)
At moderate Reynolds numbers (10(4) a parts per thousand currency sign Re a parts per thousand currency sign 10(5)), the performance of lifting surfaces is strongly affected by the potential for laminar boundary layer separation and subsequent reattachment and the use of high-quality, low-turbulence wind tunnels is essential in characterising flight at comparatively small scales (where the wing chord may be from 1 to 5 cm in length) and low speeds (on the order of 10 m/s). Measurement of the existing turbulence levels in such facilities is hard and has not been achieved using DPIV methods due to the relatively small bandwidth of measurable velocities. A series of experiments is reported here where DPIV sampling parameters are driven beyond their normal range in an attempt to measure turbulence levels in a low turbulence wind tunnel. The results show that DPIV can measure the background turbulence, and therefore its instantaneous structure. The measurements also reveal certain challenges in investigating the aerodynamic performance of small-scale flying devices. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Experiments in Fluids
volume
46
issue
3
pages
527 - 537
publisher
Springer
external identifiers
  • wos:000263114400011
  • scopus:59849087045
ISSN
1432-1114
DOI
10.1007/s00348-008-0578-1
language
English
LU publication?
yes
id
947d71bd-db92-4f62-8949-c78ded387c43 (old id 1311512)
date added to LUP
2009-03-17 10:21:07
date last changed
2017-04-23 03:35:25
@article{947d71bd-db92-4f62-8949-c78ded387c43,
  abstract     = {At moderate Reynolds numbers (10(4) a parts per thousand currency sign Re a parts per thousand currency sign 10(5)), the performance of lifting surfaces is strongly affected by the potential for laminar boundary layer separation and subsequent reattachment and the use of high-quality, low-turbulence wind tunnels is essential in characterising flight at comparatively small scales (where the wing chord may be from 1 to 5 cm in length) and low speeds (on the order of 10 m/s). Measurement of the existing turbulence levels in such facilities is hard and has not been achieved using DPIV methods due to the relatively small bandwidth of measurable velocities. A series of experiments is reported here where DPIV sampling parameters are driven beyond their normal range in an attempt to measure turbulence levels in a low turbulence wind tunnel. The results show that DPIV can measure the background turbulence, and therefore its instantaneous structure. The measurements also reveal certain challenges in investigating the aerodynamic performance of small-scale flying devices.},
  author       = {Spedding, G. R. and Hedenström, Anders and Johansson, Christoffer},
  issn         = {1432-1114},
  language     = {eng},
  number       = {3},
  pages        = {527--537},
  publisher    = {Springer},
  series       = {Experiments in Fluids},
  title        = {A note on wind-tunnel turbulence measurements with DPIV},
  url          = {http://dx.doi.org/10.1007/s00348-008-0578-1},
  volume       = {46},
  year         = {2009},
}