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Experimental control of swept-wing transition through base-flow modification by plasma actuators

  • Srikar Yadala (a1) (a2), Marc T. Hehner (a1) (a3), Jacopo Serpieri (a1), Nicolas Benard (a2), Philipp C. Dörr (a3), Markus J. Kloker (a3) and Marios Kotsonis (a1)...

Abstract

Control of laminar-to-turbulent transition on a swept-wing is achieved by base-flow modification in an experimental framework, up to a chord Reynolds number of 2.5 million. This technique is based on the control strategy used in the numerical simulation by Dörr & Kloker (J. Phys. D: Appl. Phys., vol. 48, 2015b, 285205). A spanwise uniform body force is introduced using dielectric barrier discharge plasma actuators, to either force against or along the local cross-flow component of the boundary layer. The effect of forcing on the stability of the boundary layer is analysed using a simplified model proposed by Serpieri et al. (J. Fluid Mech., vol. 833, 2017, pp. 164–205). A minimal thickness plasma actuator is fabricated using spray-on techniques and positioned near the leading edge of the swept-wing, while infrared thermography is used to detect and quantify transition location. Results from both the simplified model and experiment indicate that forcing along the local cross-flow component promotes transition while forcing against successfully delays transition. This is the first experimental demonstration of swept-wing transition delay via base-flow modification using plasma actuators.

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Copyright

This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Corresponding author

Email address for correspondence: s.yadalavenkata@tudelft.nl

References

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Experimental control of swept-wing transition through base-flow modification by plasma actuators

  • Srikar Yadala (a1) (a2), Marc T. Hehner (a1) (a3), Jacopo Serpieri (a1), Nicolas Benard (a2), Philipp C. Dörr (a3), Markus J. Kloker (a3) and Marios Kotsonis (a1)...

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