Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session A17: Flow Control: Drag Reduction
8:00 AM–9:57 AM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B304
Chair: Matthew Juniper, University of Cambridge
Abstract ID: BAPS.2018.DFD.A17.1
Abstract: A17.00001 : On the physical mechanism of turbulent boundary layer drag reduction under pulsed-dc plasma actuation*
8:00 AM–8:13 AM
Presenter:
Samaresh Midya
(Univ of Notre Dame)
Authors:
Samaresh Midya
(Univ of Notre Dame)
Flint Owen Thomas
(Univ of Notre Dame)
Thomas Charles Corke
(Univ of Notre Dame)
Experiments are reported which utilize a novel method of active flow control explicitly designed to intervene in the process of near wall streamwise vortex generation, which is a key component in turbulence production in wall-bounded flows. The flow control method utilizes flush mounted pulsed-DC plasma actuator arrays in a ZPG turbulent boundary layer at Reτ = 3200. The control flow produced by the actuator consists of a series of near-wall, spanwise opposed wall jets. These have been shown to produce significant reductions in turbulent drag. The focus of the reported experiments is to clarify the mechanism of drag reduction. Hot-wire measurements utilizing the quadrant splitting technique are performed downstream of the actuator. These are used to characterize and contrast both the duration of & time interval between quadrant 2 & 4 events in the actuated and non-actuated flows. The quadrant contributions to the Reynolds stress are compared for natural and actuated cases. The Cf for the actuated flow is computed using the FIK identity. By performing measurements over a range of distances downstream of the actuator, the characteristic streamwise distance over which the near wall organized structures relax back to the natural condition is also determined.
*NASA under NNX16CL27C
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.A17.1
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