Burst Frequency Effect of DBD Plasma Actuator on the Control of Separated Flow over an Airfoil

2012 ◽  
Author(s):  
Kengo Asada ◽  
Kozo Fujii
Keyword(s):  
Separated Flow ◽  
Plasma Actuator ◽  
Frequency Effect ◽  
Dbd Plasma ◽  
Burst Frequency

S0550204 LES of turbulent-separated flow controlled by DBD plasma actuator at high Reynolds number

2014 ◽  
Vol 2014 (0) ◽  
pp. _S0550204--_S0550204-
Author(s):  
Makoto SATO ◽  
Kengo ASADA ◽  
Taku NONOMURA ◽  
Hikaru AONO ◽  
Aiko YAKENO ◽  
...  
Keyword(s):  
Reynolds Number ◽  
High Reynolds Number ◽  
Separated Flow ◽  
Plasma Actuator ◽  
Dbd Plasma ◽  
High Reynolds ◽  
Turbulent Separated Flow

scholarly journals Investigation of a Dielectric Barrier Discharge Plasma Actuator to Control Turbulent Boundary Layer Separation

2020 ◽  
Vol 10 (6) ◽  
pp. 1911 ◽  
Author(s):  
Mahdi Hasan ◽  
Michael Atkinson
Keyword(s):  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Separated Flow ◽  
Boundary Layer Separation ◽  
Plasma Actuator ◽  
Dbd Plasma ◽  
Dielectric Barrier ◽  
Baseline Case

A numerical investigation was carried out to explore the effects of a dielectric barrier discharge (DBD) plasma actuator on a three-dimensional incompressible, separated flow. The test article selected for the simulations was the National Aeronautical and Space Administration (NASA) wall-mounted hump model. The simulations were run at a Reynolds number of 936,000, based on hump chord length, and a freestream Mach number of 0.1. Hybrid partially averaged Navier–Stokes/large-eddy simulations (PANS/LES) were completed using CALC-LES, a well-validated computational fluid dynamics (CFD) code, developed by Chalmers University of Technology. The baseline code was modified to simulate the effects of the actuator, which were modeled as source terms in the momentum equation and were assumed to be steady and constant in the span-wise direction. The numerical simulations were carried out for a baseline (no control) case and five plasma control cases. To optimize the performance of the actuator, the variation of actuator location and voltage frequency was investigated. For the baseline case, a comparison of time-averaged skin friction, the coefficient of pressure, and velocity profiles was made of the available experimental results. The results of the baseline case showed good agreement for a hybrid turbulence model, thus strengthening the solver’s ability to predict a three-dimensional separated flow with reasonable accuracy. The results with the plasma actuator turned on showed improved flow characteristics compared to the baseline simulations by reducing the region of separated flow. The actuator placed just downstream of the separation point at an operational frequency of 5kHz completely eliminated the separated flow for our test conditions.

Computational Study of Aerodynamic Characteristics of an Airfoil With DBD Plasma Actuator

2011 ◽  
Author(s):  
Kengo Asada ◽  
Kozo Fujii
Keyword(s):  
Computational Study ◽  
Lift Coefficient ◽  
Leading Edge ◽  
Aerodynamic Characteristics ◽  
Plasma Actuator ◽  
Separation Control ◽  
Vortex Center ◽  
Dbd Plasma ◽  
Burst Frequency ◽  
Burst Mode

The relation between aerodynamic characteristics and the effectiveness of separation control with the DBD plasma actuator over the airfoil are discussed. The flow-fields around the NACA0015 airfoil are simulated with implicit large-eddy simulation using compact difference scheme. The normal mode generates moderately separated region over the airfoil and gains lift by negative pressure at the vortex center. The burst mode with nondimensional burst frequency of 1 enhances the vortex shedding from the separation shear layer and avoid the massive separation from the leading edge. However, the lift coefficient oscillate very much, in this case. The burst mode with nondimensional burst frequency of 6 improves the airfoil performance by suppressing the separation region. These facts indicate that the unsteady aerodynamic characteristics must be discussed when the effectiveness of separation control is evaluated.

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