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Related Concept Videos

Boundary Layer Characteristics01:18

Boundary Layer Characteristics

When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
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Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron
09:41

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Turbulent boundary-layer control with plasma actuators.

Kwing-So Choi1, Timothy Jukes, Richard Whalley

  • 1Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK. kwing-so.choi@nottingham.ac.uk

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|March 9, 2011
PubMed
Summary
This summary is machine-generated.

This study reviews flow control for reducing aerodynamic drag. Spanwise oscillation and travelling waves, using plasma actuators, achieved up to 45% skin-friction reduction by modifying near-wall structures.

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Area of Science:

  • Fluid dynamics
  • Aerodynamics
  • Plasma physics

Background:

  • Turbulent boundary layers cause significant drag on aerodynamic bodies.
  • Effective skin-friction reduction is crucial for improving aerodynamic efficiency.
  • Existing control strategies often involve complex mechanical systems.

Purpose of the Study:

  • To review turbulent boundary-layer control strategies for skin-friction reduction.
  • To focus on drag-reduction mechanisms of spanwise oscillation and spanwise travelling wave.
  • To explore the implementation of these techniques using dielectric-barrier discharge plasma actuators.

Main Methods:

  • Review of existing literature on turbulent boundary-layer control.
  • Analysis of drag-reduction mechanisms associated with spanwise oscillation and travelling wave techniques.
  • Investigation of dielectric-barrier discharge plasma actuators for flow control.
  • Examination of experimental results demonstrating near-wall structure modifications.

Main Results:

  • Spanwise oscillation and spanwise travelling waves demonstrated up to 45% skin-friction reduction.
  • Dielectric-barrier discharge plasma actuators offer a viable, solid-state method for implementing these control techniques.
  • The specific control technique influenced the modifications observed in near-wall turbulent structures.

Conclusions:

  • Spanwise oscillation and travelling wave flow control are effective for skin-friction reduction.
  • Plasma actuators provide a practical, low-maintenance solution for implementing advanced flow control.
  • Understanding near-wall structure modifications is key to optimizing drag reduction strategies.