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Passive boundary layer control of oblique disturbances by finite-amplitude streaks

Published online by Cambridge University Press:  14 May 2014

Shahab Shahinfar ,
Sohrab S. Sattarzadeh Open the ORCID record for Sohrab S. Sattarzadeh [Opens in a new window]  and
Jens H. M. Fransson
Shahab Shahinfar
Affiliation:
Linné Flow Centre, KTH Mechanics, SE-10044 Stockholm, Sweden
Sohrab S. Sattarzadeh
Affiliation:
Linné Flow Centre, KTH Mechanics, SE-10044 Stockholm, Sweden
Jens H. M. Fransson*
Affiliation:
Linné Flow Centre, KTH Mechanics, SE-10044 Stockholm, Sweden
*
†Email address for correspondence: jensf@kth.se
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Abstract

Recent experimental results on the attenuation of two-dimensional Tollmien–Schlichting wave (TSW) disturbances by means of passive miniature vortex generators (MVGs) have shed new light on the possibility of delaying transition to turbulence and hence accomplishing skin-friction drag reduction. A recurrent concern has been whether this passive flow control strategy would work for other types of disturbances than plane TSWs in an experimental configuration where the incoming disturbance is allowed to fully interact with the MVG array. In the present experimental investigation we show that not only TSW disturbances are attenuated, but also three-dimensional single oblique wave (SOW) and pair of oblique waves (POW) disturbances are quenched in the presence of MVGs, and that transition delay can be obtained successfully. For the SOW disturbance an unusual interaction between the wave and the MVGs occurs, leading to a split of the wave with one part travelling with a‘mirrored’ phase angle with respect to the spanwise direction on one side of the MVG centreline. This gives rise to $\Lambda $ -vortices on the centreline, which force a low-speed streak on the centreline, strong enough to overcome the high-speed streak generated by the MVGs themselves. Both these streaky boundary layers seem to act stabilizing on unsteady perturbations. The challenge in a passive control method making use of a non-modal type of disturbances to attenuate modal disturbances lies in generating stable streamwise streaks which do not themselves break down to turbulence.

JFM classification

Boundary Layers: Boundary layer control Boundary Layers: Boundary layer stability Instability: Transition to turbulence

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Type
Papers
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Journal of Fluid Mechanics , Volume 749 , 25 June 2014 , pp. 1 - 36
Copyright
© 2014 Cambridge University Press 

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