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Delegates are invited to meet and discuss with the poster presenters in this topic directly after the session 'Advanced rotor technologies' taking place on Tuesday, 11 March 2014 at 11:15-12:45. The meet-the-authors will take place in the poster area.

Motofumi Tanaka Toshiba Corporation, Japan
Co-authors:
Motofumi Tanaka (1) F P Toshiki Osako (1) Hisashi Matsuda (1) Kenichi Yamazaki (1) Naohiko Shimura (1) Masahiro Asayama (1) Yukihiro Oryu (2) Satoru Yoshida (3)
(1) Toshiba Corporation, Fuchu-Shi, Japan (2) Hokutaku Co.,LTD, Asahikawa, Japan (3) Kagoshima Wind Energy Institute, Kagoshima, Japan

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Presenter's biography

Biographies are supplied directly by presenters at EWEA 2014 and are published here unedited

Mr. Tanaka is working in TOSHIBA CORPORATION. He is currently a member of Power and
Industrial Systems R&D Center. He studied nuclear physics in Osaka University. After his
studies he spent 18 years in TOSHIBA CORPORATION engaging in researches on the industrial
application of the plasma technology such as destruction of hazardous waste, or cleaning of
exhausted gases from automobiles or factories. His research is focused now on plasma aerodynamic
control technology.

Abstract

The world's first trial for application of plasma aerodynamic control on commercial scale wind turbine

Introduction

Active aerodynamic control can offer great reduction to the total cost of wind power by improving efficiency and reducing fatigue load. Plasma actuation is one of the most feasible approaches. It utilizes an induced jet from thin plasma electrodes on a blade surface to introduce momentum or excitation into a boundary layer of the blade. It is fully electric and requires no moving parts, so that it provides very fast and robust aerodynamic control. The present work shows the first experimental work that could confirm power enhancement effect of plasma flow control on MW class field rotor.

Approach

Toshiba has been developing plasma actuation to apply for wind turbines. Several wind tunnel experiments were carried out to investigate effects of plasma actuation on 2-D airfoil and small rotating horizontal axis wind turbine. Last year, the first field test of a plasma aerodynamic controlled wind turbine was conducted at Mie University 30kW field rotor. As a result, it was confirmed that the torque augmentation is feasible using leading edge separation control by plasma actuation. However, there was a remaining question whether this device is effective for commercial scale large rotor.

Main body of abstract

The test turbine was a Vestas V-66 field rotor at Kagoshima windpower institute. It is a pitch regulated variable-speed turbine with a rated power of 1.75MW and rotor diameter of 66m, the tower hight of 65m. Turbine condition was measured using tachometer, yaw counter, power meter mounted on the nacelle and pitch monitor on the hub. Wind condition was measured by an ultrasonic anemometer on the top of the nacelle. Data sampling frequency was 1Hz and each five seconds averaged data were evaluated. Thin dielectric barrier discharge electrodes of 8m in length were developed considering the durability in outdoor environment. They were installed on the surface of the leading edge of each blade. Plasma power sources which has maximum output voltage of 10kV were mounted in the root of each blades. Input voltage for power source was distributed from nacelle trough a slip ring. A lightning protection system was also equipped.
The atmospheric pressure plasma was successfully produced on the electrodes on the rotating blade. In the case of auto-yawing mode, a clear difference in revolutional speed between ‘plasma OFF’ and ‘plasma ON’ case were observed. It indicates the rotor torque was enhanced by plasma actuation. Average power was enhanced about 14% in this test period. Even for flow condition of Reynolds’ number above the sixth power of 10, it was confirmed that the power enhancement is feasible using leading edge separation flow control by plasma actuation.


Conclusion

The first trial for application of plasma aerodynamic control on commercial scale large rotor was conducted using 1.75MW commercial turbine. Plasma electrodes were equipped to control the leading edge flow separation. As a result, it was confirmed that the power enhancement was feasible using leading edge separation control by plasma actuation. We believe many other effects will be possible by using this technique, such as reduction of fatigue load and aero-acoustic noise or control of wake turbulence.


Learning objectives
Delegates attending this conference session can expect to learn about the potential of plasma aerodynamic control.
Ideas for wide range applicaion should be discussed to use this new tool for next generation wind turbine.