Closed-Loop Active Flow Control of a Three-Dimensional Turret Wake

2013 ◽  
Author(s):  
Patrick Shea ◽  
Mark Glauser
Keyword(s):  
Flow Control ◽  
Closed Loop ◽  
Active Flow Control ◽  
Three Dimensional ◽  
Active Flow

Closed-Loop Active Flow Control of a Three-Dimensional Turret Wake

AIAA Journal ◽  
2014 ◽  
Vol 52 (10) ◽  
pp. 2165-2175
Author(s):  
Patrick R. Shea ◽  
Mark N. Glauser
Keyword(s):  
Flow Control ◽  
Closed Loop ◽  
Active Flow Control ◽  
Three Dimensional ◽  
Active Flow

Closed-Loop Active Flow Control of the Wake of a Compressor Blade by Trailing-Edge Blowing

2015 ◽  
Author(s):  
Matthias Kiesner ◽  
Rudibert King
Keyword(s):  
Flow Control ◽  
Mass Flow ◽  
Closed Loop ◽  
Active Flow Control ◽  
Hammerstein Model ◽  
Robust Controller ◽  
Trailing Edge ◽  
Velocity Deficit ◽  
Reference Velocity ◽  
Active Flow

This paper presents a closed-loop active flow control strategy to reduce the velocity deficit of the wake of a compressor stator blade. The unsteady stator-rotor interaction, caused by the incoming stator wakes, generates fast changes of the rotor blade loading, affecting the stability and the performance of the overall compressor. Negative effects will be seen likewise when unsteady combustion concepts, such as a pulsed detonation, produce upstream disturbances. Furthermore, the periodic unsteady flow leads to additional undesired effects such as noise and blade vibrations. A controlled reliable manipulation of the stator wake is a way to handle these issues. Therefore, investigations on wake manipulation with trailing-edge blowing were carried out on a new low-speed cascade test rig. Detailed information about the wake profile is obtained by five-hole probe measurements in a plane downstream of the cascade for the natural and the actuated flow at a Reynolds number of 6×105. These measurements show a significant reduction of the wake velocity deficit for the investigated actuator geometry with an injection mass flow of less than 1% of the passage mass flow. Based on these results a position in the wake was chosen which is representative for the actuation impact on the velocity deficit. There, a hot-wire-probe measurement serves as the controlled variable. A family of linear dynamic black-box models was identified from experimental data to account for nonlinear and unmodelled effects. Static nonlinearitiy was compensated for by a Hammerstein model to reduce the model uncertainty and get a higher controller performance. To handle off-design conditions, a robust controller working in a range of Reynolds numbers from 5×105 to 7×105 was synthesized. The task of the controller is to rapidly regulate the controlled variable to a reference velocity by changing the blowing amplitude. The synthesized robust controller was successfully tested in closed-loop experiments with good results in reference tracking for pulse series up to 20 Hz. This translates into a much higher frequency when scaled to the dimension of a real machine.

Numerical investigation of active flow control with co-flowing jet in a horizontal axis wind turbine

2020 ◽  
pp. 0309524X2096139
Author(s):  
Fangrui Shi ◽  
Yingqiao Xu ◽  
Xiaojing Sun
Keyword(s):  
Flow Control ◽  
Wind Turbine ◽  
Performance Enhancement ◽  
Active Flow Control ◽  
Three Dimensional ◽  
Horizontal Axis ◽  
Suction Surface ◽  
Horizontal Axis Wind Turbine ◽  
Momentum Coefficient ◽  
Active Flow

In this paper, a three-dimensional numerical simulation of the aerodynamic performance of a horizontal axis wind turbine (HAWT) whose blades are equipped with a new active flow control concept called Co-Flowing Jet (CFJ) is carried out. Numerical results show that the use of CFJ over the blade suction surface can effectively delay flow separation, thus improving the net torque and power output of HAWT. Besides, this increment in the net power produced by the turbine is considerably higher than the power consumed by the CFJ. Thus, the overall efficiency of the HAWT can be greatly increased. Furthermore, influences of different CFJ operating parameters including location of injection port, jet momentum coefficient and slot length on the performance enhancement of a HAWT are also systematically studied and the optimal combination of these parameters to obtain the best possible turbine efficiency throughout a range of different wind speeds has been identified.

Correction: Towards Efficient 2-DOF LCO Control Using a Closed-loop Nonlinear Active Flow Control Technique

2020 ◽  
Author(s):  
William MacKunis ◽  
Vladimir V. Golubev ◽  
Krishna Bhavithavya B. Kidambi ◽  
Reda R. Mankbadi ◽  
Oksana Stalnov
Keyword(s):  
Flow Control ◽  
Closed Loop ◽  
Active Flow Control ◽  
Control Technique ◽  
Active Flow

A Closed-Loop Flight Control Experiment Using Active Flow Control Actuators

2007 ◽  
Author(s):  
Ali Kutay ◽  
John Culp ◽  
Jonathan Muse ◽  
Daniel Brzozowski ◽  
Ari Glezer ◽  
...  
Keyword(s):  
Flow Control ◽  
Flight Control ◽  
Closed Loop ◽  
Control Experiment ◽  
Active Flow Control ◽  
Active Flow

Closed-loop Active Flow Control of Stall Separation using Synthetic Jets

2013 ◽  
Author(s):  
Byunghyun Lee ◽  
Minhee Kim ◽  
Byounghun Choi ◽  
Chongam Kim ◽  
H Jin Kim ◽  
...  
Keyword(s):  
Flow Control ◽  
Closed Loop ◽  
Active Flow Control ◽  
Synthetic Jets ◽  
Active Flow

Development of Closed-Loop Active Flow Control

2003 ◽  
Author(s):  
M. Samimy ◽  
M. Debiasi ◽  
E. Caraballo ◽  
H. Ozbay ◽  
M. Effe ◽  
...  
Keyword(s):  
Flow Control ◽  
Closed Loop ◽  
Active Flow Control ◽  
Active Flow
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