A1 Journal article (refereed), original research

Effect of non-ideally manufactured riblets on airfoil and wind turbine performance

Open Access publication

Publication Details
Authors: Tiainen Jonna, Grönman Aki, Jaatinen-Värri Ahti, Pyy Lauri
Publisher: Elsevier
Publication year: 2020
Language: English
Related Journal or Series Information: Renewable Energy
Volume number: 155
Start page: 79
End page: 89
Number of pages: 11
ISSN: 0960-1481
eISSN: 1879-0682
JUFO-Level of this publication: 2
Open Access: Open Access publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe2020040210168


Riblets are a passive flow control method, which can be used for drag
reduction, especially with small wind turbines that have a low Reynolds
number. Riblet manufacturing, however, is a challenging task and the
required production quality can cause extra barriers in terms of time
and costs. If a relatively low-quality riblet structure could be
successfully utilized in airfoils, it could enable wider adaptation of
this particular flow control method. Public literature lacks studies
that examine the applicability of non-ideally manufactured riblets on
the ribleted airfoil. Therefore, in this study, Constant Temperature
Anemometer and Particle Image Velocimetry are used to reveal the effect
of non-ideal riblets on their performance and the flow field downstream
of the airfoil. The measurements with a varying Reynolds number and
incidence angle are conducted in the wind tunnel. The results indicate
that, in the optimum conditions for the riblet design, the riblets
reduce drag, thicken the boundary layer, reduce turbulence intensity,
and weaken the mixing process. It is further demonstrated, that
low-quality riblets have the potential to improve the performance of
wind turbines, even when the riblet quality is lower than typically

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Last updated on 2020-14-04 at 12:28