Actuator selection and placement for localized feedback flow control
Actuator selection and placement for localized feedback flow control
复制标题
用于局部反馈流量控制的执行器选择和放置
DOI：
10.1017/jfm.2016.700
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发表时间：
2016
影响因子：
3.7
通讯作者：
D. Bodony
中科院分区：
文献类型：
--
作者：
M. Natarajan;J. Freund;D. Bodony
基于线性反馈控制的线性化演化算子的特征系统结构敏感度，提出了一种新的方法来选择和放置执行器和传感器来控制可压缩粘性流动。正向和伴随的全局模式被用来构造线性化算子的可能扰动空间，这就产生了一个小的优化问题，用于选择最能达到控制目标的参数，包括它们应该放置在哪里。该方法是通过通知激励来抑制高亚声速扩散器中边界层分离不稳定性的放大。在适当的雷诺数下，分离的剪切层在较短的下游距离内完全稳定。更高的雷诺数和更长的距离预计更难稳定；在这里，通过程序进行的控制仍然实质上抑制了不稳定的放大。它还表明，更复杂的执行器-传感器选择可能不会产生更好的控制器。
The selection and placement of actuators and sensors to control compressible viscous flows is addressed by developing a novel methodology based upon the eigensystem structural sensitivity of the linearized evolution operator appropriate for linear feedback control. Forward and adjoint global modes are used to construct a space of possible perturbations to the linearized operator, which yields a small optimization problem for selecting the parameters that best achieve the control objective, including where they should be placed. The method is demonstrated by informing actuation to suppress amplification of the instabilities in boundary layer separation in a high-subsonic diffuser. Complete stabilization is observed in the separated shear layer for short downstream distances at modest Reynolds number. Higher Reynolds numbers and longer distances are expected to be more challenging to stabilize; here the control informed by the procedure still substantively suppresses amplification of instabilities. It is also demonstrated that more complex actuator–sensor selections may not yield superior controllers.