Volume 15, Issue 6
Output Feedback Control of Flow Separation over an Aerofoil Using Plasma Actuators

R. Broglia, K.-S. Choi, P. Houston, L. PasqualeP. Zanchetta

Int. J. Numer. Anal. Mod., 15 (2018), pp. 864-883.

Published online: 2018-08

[An open-access article; the PDF is free to any online user.]

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  • Abstract

We address the problem of controlling the unsteady flow separation over an aerofoil, using plasma actuators. Despite the complexity of the dynamics of interest, we show how the problem of controlling flow separation can be formulated as a simple set-point tracking problem, so that a simple control strategy may be used. A robust output feedback control is designed, on the basis of a low-order, linear, dynamical model approximating the incompressible Navier-Stokes equations, obtained from the snapshots of 2D laminar finite element simulations at Re = 1, 000. Fast flow reattachment is achieved, along with both stabilisation and increase/reduction of the lift/drag, respectively. Accurate 2D finite element simulations of the full-order nonlinear equations illustrate the effectiveness of the proposed approach: good dynamic performances are obtained, as both the Reynolds number and the angle of attack are varied. The chosen output can be experimentally measured by appropriate sensors and, despite its simplicity, the proposed set-point tracking controller is sufficient to suppress the laminar separation bubble; moreover, its extension to 3D turbulent configurations is straightforward ([33; 7]), thus illustrating the effectiveness of the designed control algorithm in more practical conditions, which are far from the design envelope.

  • Keywords

Feedback flow control robust control reduced-order modelling Plasma actuators nonlinear systems.

  • AMS Subject Headings

65XX.

  • Copyright

COPYRIGHT: © Global Science Press

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@Article{IJNAM-15-864, author = {Broglia , R. and Choi , K.-S. and Houston , P. and Pasquale , L. and Zanchetta , P.}, title = {Output Feedback Control of Flow Separation over an Aerofoil Using Plasma Actuators}, journal = {International Journal of Numerical Analysis and Modeling}, year = {2018}, volume = {15}, number = {6}, pages = {864--883}, abstract = {

We address the problem of controlling the unsteady flow separation over an aerofoil, using plasma actuators. Despite the complexity of the dynamics of interest, we show how the problem of controlling flow separation can be formulated as a simple set-point tracking problem, so that a simple control strategy may be used. A robust output feedback control is designed, on the basis of a low-order, linear, dynamical model approximating the incompressible Navier-Stokes equations, obtained from the snapshots of 2D laminar finite element simulations at Re = 1, 000. Fast flow reattachment is achieved, along with both stabilisation and increase/reduction of the lift/drag, respectively. Accurate 2D finite element simulations of the full-order nonlinear equations illustrate the effectiveness of the proposed approach: good dynamic performances are obtained, as both the Reynolds number and the angle of attack are varied. The chosen output can be experimentally measured by appropriate sensors and, despite its simplicity, the proposed set-point tracking controller is sufficient to suppress the laminar separation bubble; moreover, its extension to 3D turbulent configurations is straightforward ([33; 7]), thus illustrating the effectiveness of the designed control algorithm in more practical conditions, which are far from the design envelope.

}, issn = {2617-8710}, doi = {https://doi.org/}, url = {http://global-sci.org/intro/article_detail/ijnam/12612.html} }
TY - JOUR T1 - Output Feedback Control of Flow Separation over an Aerofoil Using Plasma Actuators AU - Broglia , R. AU - Choi , K.-S. AU - Houston , P. AU - Pasquale , L. AU - Zanchetta , P. JO - International Journal of Numerical Analysis and Modeling VL - 6 SP - 864 EP - 883 PY - 2018 DA - 2018/08 SN - 15 DO - http://doi.org/ UR - https://global-sci.org/intro/article_detail/ijnam/12612.html KW - Feedback flow control KW - robust control KW - reduced-order modelling KW - Plasma actuators KW - nonlinear systems. AB -

We address the problem of controlling the unsteady flow separation over an aerofoil, using plasma actuators. Despite the complexity of the dynamics of interest, we show how the problem of controlling flow separation can be formulated as a simple set-point tracking problem, so that a simple control strategy may be used. A robust output feedback control is designed, on the basis of a low-order, linear, dynamical model approximating the incompressible Navier-Stokes equations, obtained from the snapshots of 2D laminar finite element simulations at Re = 1, 000. Fast flow reattachment is achieved, along with both stabilisation and increase/reduction of the lift/drag, respectively. Accurate 2D finite element simulations of the full-order nonlinear equations illustrate the effectiveness of the proposed approach: good dynamic performances are obtained, as both the Reynolds number and the angle of attack are varied. The chosen output can be experimentally measured by appropriate sensors and, despite its simplicity, the proposed set-point tracking controller is sufficient to suppress the laminar separation bubble; moreover, its extension to 3D turbulent configurations is straightforward ([33; 7]), thus illustrating the effectiveness of the designed control algorithm in more practical conditions, which are far from the design envelope.

R. Broglia, K.-S. Choi, P. Houston, L. Pasquale & P. Zanchetta. (2020). Output Feedback Control of Flow Separation over an Aerofoil Using Plasma Actuators. International Journal of Numerical Analysis and Modeling. 15 (6). 864-883. doi:
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