Turbulent Boundary Layer Separation Control Using Plasma Actuators

2008 ◽  
Author(s):  
David Schatzman ◽  
Flint Thomas
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Boundary Layer Separation ◽  
Plasma Actuators ◽  
Separation Control ◽  
Layer Separation

Turbulent Boundary Layer Separation Control by Using DBD Plasma Actuators: Part I—Experimental Investigation

2010 ◽  
Author(s):  
Xiaofei Xu ◽  
Huu Duc Vo ◽  
Njuki Mureithi ◽  
Xue Feng Zhang
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Boundary Layer Separation ◽  
Plasma Actuators ◽  
Separation Control ◽  
Dbd Plasma ◽  
Control Techniques ◽  
Layer Separation ◽  
Plasma Actuation ◽  
Turbulent Separation

Turbulent boundary layer separation is an important issue for a variety of applications, one of which is S-shaped aircraft engine intakes. The turbulent separation at the engine intake causes inlet flow distortion, which can deteriorate engine performance, cause fatigue and reduce engine component life. Various flow control techniques have been applied for turbulent boundary layer separation control, such as vortex generators, vortex generator jets and synthetic jets. The recent advent of dielectric barrier discharge (DBD) plasma actuators can potentially provide a robust method for the control of turbulent boundary layer separation. Compared to other flow control techniques, these new actuators are simple, robust and devoid of moving mechanical parts, which make them ideal for aerodynamic applications. The present work studies the effects of DBD plasma actuators on the suppression of 2-D turbulent boundary layer separation induced by an imposed adverse pressure gradient. First, the flow field with and without actuation in a low-speed wind tunnel is investigated experimentally by Particle Image Velocimetry (PIV) measurements. The results show that plasma actuation can suppress turbulent boundary layer separation in both continuous and pulsed modes. In the pulsed mode, the actuation with an optimal actuation frequency, corresponding to a dimensionless frequency of order one, is found to most effectively suppress the turbulent separation. Moreover, the effects of plasma actuation on the flow is demonstrated and analyzed by using Proper Orthogonal Decomposition (POD). The effect of the actuation is found to be correlated to the second POD mode which corresponds to large flow fluctuations.

Turbulent Boundary Layer Separation Control by Using DBD Plasma Actuators: Part II—Numerical Model Validation and Parametric Study

2010 ◽  
Author(s):  
Xiaofei Xu ◽  
Huu Duc Vo ◽  
Njuki Mureithi ◽  
Xue Feng Zhang
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Parametric Study ◽  
Boundary Layer Separation ◽  
Plasma Actuator ◽  
Plasma Actuators ◽  
Low Flow ◽  
Dbd Plasma ◽  
Layer Separation ◽  
Flow Velocities

Following an experimental investigation into suppression of a 2-D turbulent boundary layer separation with dielectric barrier discharge (DBD) plasma actuators, the present work investigates the concept numerically. The purpose is to develop and validate a simulation tool that captures the flow physics and carry out a parametric study of the concept at flow regimes beyond the current flow control capability of plasma actuators of conventional strength. First, a plasma actuator model is integrated into the commercial computational fluid dynamics (CFD) code ANSYS CFX to simulate the effects of plasma actuation. This computational tool is validated through comparison of results with the experimental results for pulsed actuation in quiescent air and for the control of a turbulent boundary layer separation at low flow velocities. It is shown that CFX with an integrated plasma model can capture the main experimentally observed effects of DBD actuators on turbulent boundary layer separation. Subsequently, this numerical approach is used, with increased plasma actuator strength, to study the influence of different actuation parameters (e.g., actuation location, direction and frequency) on suppression of turbulent boundary layer separation at higher flow velocities.

Numerical study of boundary layer separation control using magnetogasdynamic plasma actuators

2009 ◽  
Vol 21 (10) ◽  
pp. 106101 ◽  
Author(s):  
Chiranjeev S. Kalra ◽  
Mikhail N. Shneider ◽  
Richard B. Miles
Keyword(s):  
Boundary Layer ◽  
Numerical Study ◽  
Boundary Layer Separation ◽  
Plasma Actuators ◽  
Separation Control ◽  
Layer Separation

Experimental study of laminar and turbulent boundary layer separation control of shark skin

2016 ◽  
Vol 12 (1) ◽  
pp. 016009 ◽  
Author(s):  
Farhana Afroz ◽  
Amy Lang ◽  
Maria Laura Habegger ◽  
Philip Motta ◽  
Robert Hueter
Keyword(s):  
Boundary Layer ◽  
Experimental Study ◽  
Turbulent Boundary Layer ◽  
Boundary Layer Separation ◽  
Separation Control ◽  
Shark Skin ◽  
Layer Separation
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