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Flat plate drag reduction using plasma-generated streamwise vortices

Published online by Cambridge University Press:  11 May 2021

X.Q. Cheng Open the ORCID record for X.Q. Cheng [Opens in a new window] ,
C.W. Wong ,
F. Hussain Open the ORCID record for F. Hussain [Opens in a new window] ,
W. Schröder Open the ORCID record for W. Schröder [Opens in a new window]  and
Y. Zhou
X.Q. Cheng
Affiliation:
Center for Turbulence Control, Harbin Institute of Technology, Shenzhen518055, China
C.W. Wong*
Affiliation:
Center for Turbulence Control, Harbin Institute of Technology, Shenzhen518055, China
F. Hussain
Affiliation:
Department of Mechanical Engineering, Texas Tech University, Lubbock, TX79409, USA
W. Schröder
Affiliation:
Institute of Aerodynamics, RWTH Aachen University, 52062 Aachen, Germany
Y. Zhou*
Affiliation:
Center for Turbulence Control, Harbin Institute of Technology, Shenzhen518055, China
*
†Email addresses for correspondence: cwwong@hit.edu.cn, yuzhou@hit.edu.cn
†Email addresses for correspondence: cwwong@hit.edu.cn, yuzhou@hit.edu.cn
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Abstract

We present an experimental study of a turbulent boundary layer (TBL) control on a flat plate using plasma actuators. Three different configurations of the actuators produce spanwise arrays of large-scale streamwise vortices (LSSVs). An ultra-high-resolution floating element (FE) force balance, developed in house and calibrated using μ-particle tracking velocimetry, is employed to measure wall friction. The FE captures a drag reduction (DR) of up to 26 % on the FE area (667 × 1333 wall units), downstream of the actuators. The local DR persists downstream, well after the LSSVs disappear. Both plasma-generated flow and the TBL under control are compared with an uncontrolled TBL. The maximum DR takes place when the LSSVs producing wall jets reach a spanwise velocity of 3.9 in wall units. The flow is altered by up to 29 % of the TBL thickness, with a drop in the new vortices due to the control-induced stabilization of the wall streaks. The local friction is characterized by three distinct spatial regions of drag increase, pronounced DR and drag recovery – all connected to the LSSVs. The LSSVs push the streaks to the middle between two adjacent actuators, suppressing transient growth and near-wall turbulent production. A DR mechanism is proposed.

JFM classification

Boundary Layers: Boundary layer control Flow Control: Drag reduction Turbulent Flows: Turbulent boundary layers
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 918 , 10 July 2021 , A24
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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