Towards laminar flow control on swept wings with AC-DBD plasma actuators as active roughness

Jacopo Serpieri, Srikar Yadala Venkata, Marios Kotsonis

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

6 Citations (Scopus)


In the present work, laminar flow control, following the distributed roughness elements (DRE) - upstream flow deformation (UFD) strategy, was attempted on a 45° swept wing at Re = 2:17·106undergoing cross-flow (CF) instability transition. Active roughness-like AC-DBD plasma actuators were used for this purpose. Specialized patterned actuators have been designed, manufactured and tested to this goal. The effectiveness in forcing monochromatic stationary modes was assessed by means of infrared thermography. Finally, quantitative measurements of the transitional boundary layer were performed with high-speed PIV. This advanced flow diagnostics tool allows the investigation of the effects on the boundary layer of the unsteady forcing, inherent to the effect of the used actuators. It is found that, despite the actuators were operated at a frequency considerably larger than the frequency band of the (primary travelling) CF instability, the latter resulted massively amplified by the actuation. The causes of this phenomen are here only conjectured and require future dedicated investigation. The eventual beneficial effects of the DRE/UFD flow control technique are likely overwhelmed by the nocent amplification of travelling modes. The technological possibility of very high frequency forcing therefore can limit the usage of AC-DBD actuators for DRE/UFD laminar flow control in high Reynolds numbers flows.

Original languageEnglish
Title of host publicationAIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages14
ISBN (Electronic)9781624104473
Publication statusPublished - 2017
Event55th AIAA Aerospace Sciences Meeting - Grapevine, United States
Duration: 9 Jan 201713 Jan 2017


Conference55th AIAA Aerospace Sciences Meeting
Country/TerritoryUnited States
Internet address


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