Development of flow separation control system to reduce the vibration of wind turbine blades

2017 ◽  
Author(s):  
Ho-Young Kim ◽  
Ho-Hyun Kim ◽  
Jong-Seob Han ◽  
Jae-Hung Han
Keyword(s):  
Control System ◽  
Wind Turbine ◽  
Flow Separation ◽  
Turbine Blades ◽  
Separation Control ◽  
Wind Turbine Blades ◽  
Flow Separation Control

Development of a MEMS-Based Active Control System for Flow Separation in the Transonic Regime

2000 ◽  
Author(s):  
Steve Tung ◽  
Brant Maines ◽  
Fukang Jiang ◽  
Tom Tsao
Keyword(s):  
Shear Stress ◽  
Control System ◽  
Wind Tunnel ◽  
Flow Separation ◽  
Control Flow ◽  
Separation Control ◽  
Sensors And Actuators ◽  
Trailing Edge ◽  
Flow Separation Control ◽  
Mach Numbers

Abstract A MEMS-based active system is currently under development for flow separation control in the transonic regime. The system consists of micro shear stress sensors for flow sensing and micro balloon actuators for separation control. We have successfully completed the first phase of the program in which the micro sensors and actuators were fabricated and tested in a wind tunnel facility. In the test, the sensors and actuators were flush mounted on a 3D model, which is representative of the upper surface of a wing with a deflected trailing edge flap. The model was installed in the wind tunnel and tested at a series of Mach numbers between 0.2 and 0.6. For all Mach numbers, the sensor output indicates that flow separates over the trailing edge when the micro balloons are in the ‘down’ position. When the micro balloons are inflated, the shear stress level on the trailing edge increases substantially, indicating an improvement of the separation characteristics. This result demonstrates the feasibility of using MEMS sensors and actuators to control flow separation. It is the first step toward the development of a revolutionary closed loop flow control system applicable to existing and future aircraft to enhance aerodynamic performance.

Active control of flow separation and structural vibrations of wind turbine blades

Wind Energy ◽  
2010 ◽  
Vol 13 (2-3) ◽  
pp. 221-237 ◽  
Author(s):  
Victor Maldonado ◽  
John Farnsworth ◽  
William Gressick ◽  
Michael Amitay
Keyword(s):  
Wind Turbine ◽  
Active Control ◽  
Flow Separation ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Structural Vibrations ◽  
Control Of Flow

Investigate aerodynamic performance of wind turbine blades with vortex generators at the transition area

2021 ◽  
pp. 0309524X2110385
Author(s):  
Zhou Wu ◽  
Tao Chen ◽  
Haipeng Wang ◽  
Hongwei Shi ◽  
Mingzhou Li
Keyword(s):  
Wind Turbine ◽  
Flow Separation ◽  
Turbine Blades ◽  
Simulation Method ◽  
High Energy ◽  
Aerodynamic Performance ◽  
Vortex Generators ◽  
Geometrical Parameters ◽  
Wind Turbine Blades ◽  
Transition Area

The transition area of the blade had a large relative thickness of airfoil, which was prone to the flow separation. The vortex generators (VGs) could restrain the flow separation. In this paper, the VGs were installed at the transition area of the WindPACT 1.5 MW wind turbine blades. The numerical simulation method was used to investigate the effects of the VGs on the aerodynamic performance of the blade. The high-energy vortexes were generated at the tail by the VG. It could change the energy distribution and flow characteristics of the airflow in the boundary layer. There were influences by the geometric parameters of the VGs. The VGs could change the aerodynamic performance at the transition area of the blade. A satisfactory result was obtained for reasonable geometrical parameters of the VGs. It also could restrain the flow separation of the blade surface and improve the torque.

Investigation of Wind Turbine Blades with Tubercles

2014 ◽  
Vol 1051 ◽  
pp. 832-839 ◽  
Author(s):  
Kelvin Leung
Keyword(s):  
Flow Visualization ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Flow Separation ◽  
Power Output ◽  
Turbine Blades ◽  
Length Ratio ◽  
Wind Turbine Blades

This paper describes the testing of wind turbine blades with tubercles in two different ways: outdoor testing and flow visualization. In the outdoor testing, the tubercle pitch was varied for turbine blade lengths of 30 cm, 40 cm, and 50 cm. The pitch-to-length ratio of approximately 1/10 to 1/16 produced the most power output. In flow visualization, both tubercle pitch and amplitude were varied. Vortices created behind the tubercles were shown to increase lift by minimizing flow separation.

Unsteady Separation Control on Wind Turbine Blades using Fluidic Oscillators

AIAA Journal ◽  
2010 ◽  
Vol 48 (7) ◽  
pp. 1302-1311 ◽  
Author(s):  
Ciro Cerretelli ◽  
Werner Wuerz ◽  
Emad Gharaibah
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Separation Control ◽  
Wind Turbine Blades ◽  
Unsteady Separation

Flow Analysis of Straight and Swept Edge Wind Turbine Blades in Blade and Wake Regions

2012 ◽  
Author(s):  
Ryoichi S. Amano ◽  
Pradeep Mohan Mohan Das ◽  
Mohammed Alnakhli
Keyword(s):  
Wind Turbine ◽  
Cross Section ◽  
Flow Separation ◽  
Turbine Blades ◽  
Flow Analysis ◽  
Rotor Blades ◽  
Straight Edge ◽  
Wind Turbine Blades ◽  
Horizontal Axis Wind Turbine ◽  
High Reynolds

This paper presents the comparison of the wake sizes and shapes between two different designs of a horizontal axis wind turbine (HAWT) rotor blades; one a straight edged and the other with a backward sweep. The straight edge blade was constructed so that it is optimal for on coming wind and rotation speeds with 7m/s and 23rpm. The blade has a length of 20m and uses a constant airfoil cross section. The swept edge blade has the same characteristics as the straight edge except for the trajectory of the edge. Each swept blade has the same cross section with the same dimensions at the same distance from the hub as its corresponding section in the straight edge blade. The analysis was done at a range of velocities from 7 m/s to 18 m/s. It was confirmed that the stall region observed by previous studies is in fact due to the flow separation throughout the span of the blade for both the straight and swept blades. A comparison of wake lengths for both straight and swept blades was done for a range of wind velocities. It was shown that the wake length for swept edged blades were longer than for straight blades and both start decreasing beyond the stall region. From a comparison of flow separation angles from experiments and CFD computations, both were observed to follow the same trends at high Reynolds numbers.

Experiments of Wind Turbine Blades with Rocket Triggered Lightning

2009 ◽  
Vol 129 (5) ◽  
pp. 689-695
Author(s):  
Masayuki Minowa ◽  
Shinichi Sumi ◽  
Masayasu Minami ◽  
Kenji Horii
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Triggered Lightning
Sign in / Sign up

Export Citation Format

Share Document