Proceeding of Seventh International Symposium on Turbulence and Shear Flow Phenomena
... Becker, R., King, R., Petz, R. & Nitsche, W. 2007 Adative closed-loop separation control ... more ... Becker, R., King, R., Petz, R. & Nitsche, W. 2007 Adative closed-loop separation control on a high-lift configuration using extremum seeking. ... Carlier, J. & Stanislas, M. 2005 Experimental study of eddy structures in a turbulent boundary layer using particule image velocimetry. ...
This work addresses the problem of developing control algorithms for the control of the aerodynam... more This work addresses the problem of developing control algorithms for the control of the aerodynamic lift of wind turbine blades using air injection, taking into account disturbances caused by turbulent perturbations. For this, a test bench is used where the lift of a 2D blade section in a wind tunnel can be controlled by a set of micro-jets close to the trailing edge. Through a continuous, local identification of the lift variations a model-free control that does not need any prior knowledge of the system is proposed. It allows the control of the flow of the micro-jets and stabilizes the lift around a tracking reference. The ability of the proposed control algorithm to track the lift reference when subjected to external perturbations, i.e., gusts, is discussed. In particular, this work demonstrates that the lift can be set to particular values using the proposed control strategy, and can be re-stabilized to pre-gust lift conditions. Experimental results illustrate globally the feasi...
We propose to combine the active vortex generators with the particle image velocimetry (PIV) meas... more We propose to combine the active vortex generators with the particle image velocimetry (PIV) measurements and post-processing streamwise vortex characterization algorithms into a feedback based closed-loop control system for wind turbine applications. We develop two vortex identification and characterization methods that use PIV realizations for the purpose of a real-time (online or on-the-fly) feedback-based control. Both methods can extract centers and strengths of streamwise vortices generated behind active vortex generators in a turbulent boundary layer flow, and we show how to integrate those in a closed-loop control strategy. For demonstration purposes we use stereoscopic PIV measurements at the wind tunnel facility obtained in the transverse-wall-normal plane behind active vortex generators. A robust algorithm is using the Q-criteria and the integration of vorticity of each extracted vortex. Results show that a moving window average of a small number of instantaneous fields i...
35th AIAA Fluid Dynamics Conference and Exhibit, 2005
Page 1. American Institute of Aeronautics and Astronautics 1 Global Effects of Flow Control over ... more Page 1. American Institute of Aeronautics and Astronautics 1 Global Effects of Flow Control over a NACA 4412 Hydrofoil MY Andino* and C. Braud Syracuse University, Syracuse, NY, 13244 MN Glauser and H. Higuchi§ Syracuse University, Syracuse, NY, 13244, USA and ...
Proceeding of Seventh International Symposium on Turbulence and Shear Flow Phenomena
... Becker, R., King, R., Petz, R. & Nitsche, W. 2007 Adative closed-loop separation control ... more ... Becker, R., King, R., Petz, R. & Nitsche, W. 2007 Adative closed-loop separation control on a high-lift configuration using extremum seeking. ... Carlier, J. & Stanislas, M. 2005 Experimental study of eddy structures in a turbulent boundary layer using particule image velocimetry. ...
This work addresses the problem of developing control algorithms for the control of the aerodynam... more This work addresses the problem of developing control algorithms for the control of the aerodynamic lift of wind turbine blades using air injection, taking into account disturbances caused by turbulent perturbations. For this, a test bench is used where the lift of a 2D blade section in a wind tunnel can be controlled by a set of micro-jets close to the trailing edge. Through a continuous, local identification of the lift variations a model-free control that does not need any prior knowledge of the system is proposed. It allows the control of the flow of the micro-jets and stabilizes the lift around a tracking reference. The ability of the proposed control algorithm to track the lift reference when subjected to external perturbations, i.e., gusts, is discussed. In particular, this work demonstrates that the lift can be set to particular values using the proposed control strategy, and can be re-stabilized to pre-gust lift conditions. Experimental results illustrate globally the feasi...
We propose to combine the active vortex generators with the particle image velocimetry (PIV) meas... more We propose to combine the active vortex generators with the particle image velocimetry (PIV) measurements and post-processing streamwise vortex characterization algorithms into a feedback based closed-loop control system for wind turbine applications. We develop two vortex identification and characterization methods that use PIV realizations for the purpose of a real-time (online or on-the-fly) feedback-based control. Both methods can extract centers and strengths of streamwise vortices generated behind active vortex generators in a turbulent boundary layer flow, and we show how to integrate those in a closed-loop control strategy. For demonstration purposes we use stereoscopic PIV measurements at the wind tunnel facility obtained in the transverse-wall-normal plane behind active vortex generators. A robust algorithm is using the Q-criteria and the integration of vorticity of each extracted vortex. Results show that a moving window average of a small number of instantaneous fields i...
35th AIAA Fluid Dynamics Conference and Exhibit, 2005
Page 1. American Institute of Aeronautics and Astronautics 1 Global Effects of Flow Control over ... more Page 1. American Institute of Aeronautics and Astronautics 1 Global Effects of Flow Control over a NACA 4412 Hydrofoil MY Andino* and C. Braud Syracuse University, Syracuse, NY, 13244 MN Glauser and H. Higuchi§ Syracuse University, Syracuse, NY, 13244, USA and ...
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