Turbulent boundary layer drag reduction using pulsed-DC plasma actuation

Alan Duong, Samaresh Midya, Thomas C. Corke, Fazle Hussain, Flint O. Thomas

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations

Abstract

In this paper, we report on an active flow control approach that has produced unprecedented levels of turbulent boundary layer viscous drag reduction in excess of 70%. Furthermore, by incorporating a flush mounted, pulsed-DC plasma actuator array with exceedingly low power input, the power savings due to drag reduction has exceeded the power input. With regard to turbulence production mechanisms, the actuator gives rise to a reduction in the frequency of near-wall “burst-sweep” events that scales linearly with the wall shear stress. Mean velocity profiles indicate that the effect of the actuation in confined to the sublayer and buffer layer regions and the degree of drag reduction has been shown to scale with the number of low-speed streaks under simultaneous control. Besides the obvious practical interest in this flow control approach, it also offers an opportunity to provide controlled initial conditions with which to investigate the response of the turbulent boundary layer turbulence generation mechanisms.

Original languageEnglish
StatePublished - Jan 1 2019
Event11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 - Southampton, United Kingdom
Duration: Jul 30 2019Aug 2 2019

Conference

Conference11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019
CountryUnited Kingdom
CitySouthampton
Period07/30/1908/2/19

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