Active Flow Control (eBook)

Preface 6
Table of Contents 10
The Taming of the Shrew: Why Is It so Difficult to Control Turbulence? 13
Actuators 37
Electromagnetic Control of Separated Flows Using Periodic Excitation with Different Wave Forms 38
Pulsed Plasma Actuators for Active Flow Control at MAV Reynolds Numbers 53
Experimental and Numerical Investigations of Boundary- Layer Influence Using Plasma- Actuators 67
Designing Actuators for Active Separation Control Experiments on High- Lift Configurations 80
Closed-Loop Active Flow Control Systems: Actuators 96
State Estimation and Feature Extraction 114
State Estimation of Transient Flow Fields Using Double Proper Orthogonal Decomposition ( DPOD) 115
A Unified Feature Extraction Architecture 129
Air Foils 144
Control of Wing Vortices 145
Towards Active Control of Leading Edge Stall by Means of Pneumatic Actuators 160
Computational Investigation of Separation Control for High- Lift Airfoil Flows 181
Steady and Oscillatory Flow Control Tests for Tilt Rotor Aircraft 198
Cavities 216
Reduced-Order Model-Based Feedback Control of Subsonic Cavity Flows – An Experimental Approach 217
Supersonic Cavity Response to Open-Loop Forcing 236
Bluff Bodies 250
Active Drag Control for a Generic Car Model 251
Continuous Mode Interpolation for Control-Oriented Models of Fluid Flow 264
Turbomachines and Combustors 283
Active Management of Entrainment and Streamwise Vortices in an Incompressible Jet 284
Active Control to Improve the Aerodynamic Performance and Reduce the Tip Clearance Noise of Axial Turbomachines with Steady Air Injection into the Tip Clearance Gap 296
Optimal Flow Control and Numerical Studies 310
Drag Minimization of the Cylinder Wake by Trust- Region Proper Orthogonal Decomposition 311
Flow Control on the Basis of a FEATFLOW-MATLAB Coupling 327
On the Choice of the Cost Functional for Optimal Vortex Reduction for Instationary Flows 341
Flow Control with Regularized State Constraints 355
Closed-Loop Flow Control 369
Feedback Control Applied to the Bluff Body Wake 370
Active Blade Tone Control in Axial Turbomachines by Flow Induced Secondary Sources in the Blade Tip Regime 392
Phase-Shift Control of Combustion Instability Using ( Combined) Secondary Fuel Injection and Acoustic Forcing 409
Vortex Models for Feedback Stabilization of Wake Flows 423
Keyword Index 438