Output feedback control of flow separation over an aerofoil using plasma actuators
Output feedback control of flow separation over an aerofoil using plasma actuators
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发表时间：
2018-11
影响因子：
1.1
通讯作者：
R. Broglia;K. Choi;P. Houston;L. Pasquale;P. Zanchetta
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文献类型：
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作者：
R. Broglia;K. Choi;P. Houston;L. Pasquale;P. Zanchetta
本文研究了用等离子体作动器控制翼型非定常流动分离的问题。尽管感兴趣的动态的复杂性，我们展示了如何控制流分离的问题可以制定为一个简单的设定点跟踪问题，以便可以使用一个简单的控制策略。鲁棒输出反馈控制的基础上，低阶，线性，动力学模型近似不可压缩的Navier-Stokes方程，从2D层流有限元模拟在Re= 1000的快照。分别在稳定和升阻增加/减小的情况下，实现了快速流动再附着，沿着。全阶非线性方程组的精确二维有限元仿真表明了所提出方法的有效性：当雷诺数和攻角都变化时，获得了良好的动态性能。所选择的输出可以通过适当的传感器进行实验测量，尽管其简单性，所提出的设定点跟踪控制器足以抑制层流分离气泡;此外，其扩展到3D湍流配置是直接的，从而说明了所设计的控制算法在更实际的条件下，这是远离设计包络线的有效性。
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, thus illustrating the effectiveness of the designed control algorithm in more practical conditions, which are far from the design envelope.