This monograph presents the state of the art of theory and applications in fluid flow control, assembling contributions by leading experts in the field. The book covers a wide range of recent topics including vortex based control algorithms, incompressible turbulent boundary layers, aerodynamic flow control, control of mixing and reactive flow processes or nonlinear modeling and control of combustion dynamics.
Author(s): Petros Koumoutsakos, Igor Mezic
Series: Lecture Notes in Control and Information Sciences 330
Edition: 1
Publisher: Springer
Year: 2006
Language: English
Pages: 239
Tags: Механика;Механика жидкостей и газов;
3540251405......Page 1
Lecture Notes
in Control and Information Sciences 330......Page 2
Control of Fluid Flow......Page 3
Copyright page......Page 4
Preface......Page 5
Acknowledgments......Page 6
Table of contents......Page 7
List of Symbols......Page 11
1 Introduction......Page 14
2 Weak Reverse-Flow Regions......Page 19
2.1.1 Separation Control Using Fluidic Forcing at High Frequencies......Page 20
2.1.2 Separation Control Using Fluidic Forcing at Low Frequencies......Page 24
2.1.3 Separation Control Using Mechanical Forcing at Low Frequencies......Page 26
2.2 Manipulation of Trailing Edge Separation on an HQ-17 Laminar Airfoil by Means of Two-Dimensional ZNMF-Actuators......Page 28
2.2.1 The Single Slot Configuration (xslot2/c = 0.66, b = 1.2mm)......Page 30
2.3 Manipulation of Closed Reverse-Flow Regions by Free-Stream Turbulence (FST)......Page 32
3 Strong Reverse-Flow Regions......Page 36
3.1 Manipulation of the Closed Reverse-Flow Region Downstream of a Fence......Page 37
3.2 Manipulation of Strong Reverse FlowCaused by a Trapped Vortex......Page 45
4 Conclusions......Page 52
References......Page 53
1 Introduction......Page 58
2 Experimental Apparatus and Procedure......Page 61
3 Modification of the Time-Averaged Aerodynamic Performance......Page 63
4 The Role of the Actuation Frequency......Page 66
5 Elements of the Dynamics of Flow Reattachment and Separation......Page 74
6 Pulse-Modulated Reattachment......Page 78
7 Conclusions......Page 83
References......Page 85
1 Introduction......Page 87
3 Passive Control Example: The Lobed Fuel Injector......Page 88
4 Active Control Methodologies......Page 92
5 Active Control Example: The Acoustically Resonant Dump Combustor......Page 96
6 Future Directions......Page 99
References......Page 102
1 Introduction......Page 107
2 Dynamic Models of Combustion Instability......Page 109
2.1 Linear Models......Page 110
2.2 Nonlinear Models of Combustion Oscillations......Page 113
2.3 Linear Models Using a System Identification Approach......Page 117
3 Control of Combustion Instability......Page 118
3.1 Linear Control......Page 120
3.1.1 Experimental Results......Page 121
3.2 Time-delay Control......Page 122
3.2.1 Simulation Results......Page 123
3.3.2 Adaptive Time-delay Control......Page 124
3.3.4 Extremum-seeking Control......Page 125
3.3.5 Observer-based Control......Page 126
3.4 Neural Control......Page 127
4 Summary......Page 128
References......Page 130
1 Introduction......Page 134
2 Control of Plane Waves in Ducts......Page 135
3 Controller Design and Implementation......Page 136
4 Control of Higher-order Modes in Ducts......Page 138
5 Control of Sound in Enclosures......Page 139
6 Control of Sound at Source......Page 142
7 Conclusions......Page 146
References......Page 147
1 Introduction......Page 149
2 The Acoustic Equation......Page 150
2.1.1 The Hamiltonian Flow Inside Ω......Page 153
2.1.2 Interaction with the Boundary......Page 154
3 Control and Observation......Page 155
4.1 Unstable Observations Estimates......Page 157
4.2 Propagation Along Rays and High Frequency Estimates......Page 159
5 Time Reversal Methods and Ergodicity......Page 161
References......Page 165
1 Introduction......Page 167
2 Problem Statement......Page 168
3 Boundary Feedback Laws......Page 170
4 The Result......Page 171
5 Proof of Theorem......Page 172
6 Numerical Simulation......Page 174
7 Simulations with Only Parts of the Wall Controlled......Page 177
References......Page 180
1 Introduction......Page 183
2 Exact Controllability from the Boundary of the Navier–Stokes System......Page 184
3.1 Formulation of the Problem......Page 186
3.2 Preliminaries......Page 188
4.1 Theorem on Extension......Page 191
4.3 Feedback Property......Page 192
5.1 Formulation of the Stabilization Problem......Page 193
5.2 Invariant Manifolds......Page 194
5.3 Final Results......Page 196
References......Page 197
1 Introduction......Page 199
2.1 Simple Vortical Configurations......Page 200
2.2 Vortex/Solid Body Interaction......Page 201
2.3 Control of the Wake Behind a Bluff Body......Page 202
2.4 Vortex Dynamics in Shear and Mixing Layers......Page 204
3 Towards Control of Vortex Merging......Page 205
4.1 Averaging for a Co-Rotating Vortex Pair......Page 206
4.2 Two Vortices Controlled by a Strain Field......Page 208
4.3 Two Vortices in a Source/Sink Field......Page 210
5 Control of a Pair of Vortex Patches......Page 212
5.1 Flat Coordinates......Page 213
5.2 Adiabatic Control......Page 215
Conclusions......Page 216
References......Page 217
1 Introduction......Page 223
2 Multi-Objective Optimization in Combustion Processes......Page 225
3 Cylinder Drag Minimization......Page 226
4 Aerodynamic Profile Design......Page 227
5 Micromixer......Page 230
6 Microchannel Flow......Page 231
7 Jet Mixing......Page 233
8 Aircraft Trailing Vortex Destruction
......Page 234
References......Page 236
