Overspeed Control of a Variable-Pitch Vertical-Axis Wind Turbine by Means of Tail Vanes

The concept of pitch control has been implemented in the design of a small vertical-axis wind turbine. Benefits gained can be shown by the experimental and numerical results presented in this paper. As found, the method of variable pitch control outperforms the one of fixed pitch control. The present results show that the former can make remarkable improvement on the starting torque as well as the aerodynamic characteristics at low tip speed ratios.

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1811 Performance of Vertical Axis Wind Turbine with Variable Pitch Straight Blades

The Proceedings of the Fluids engineering conference ◽

10.1299/jsmefed.2005.268 ◽

2005 ◽

Vol 2005 (0) ◽

pp. 268

Author(s):

Takahiro KIWATA ◽

Shinei TAKATA ◽

Tetsuyoshi KITA ◽

Toshihiro KITAMURA ◽

Shigeo KIMURA ◽

...

Keyword(s):

Wind Turbine ◽

Vertical Axis ◽

Vertical Axis Wind Turbine ◽

Variable Pitch

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0211 Effects of Wing Section on the Performance of Drag-type Vertical Axis Wind Turbine with Variable-pitch Blades

The Proceedings of Conference of Hokuriku-Shinetsu Branch ◽

10.1299/jsmehs.2013.50.021101 ◽

2013 ◽

Vol 2013.50 (0) ◽

pp. 021101-021102

Author(s):

Koji NAGAO ◽

Takahiro KIWATA ◽

Yoshiaki SAWADE ◽

Yurie KOAMI ◽

Takaaki KONO ◽

...

Keyword(s):

Wind Turbine ◽

Vertical Axis ◽

Vertical Axis Wind Turbine ◽

Variable Pitch ◽

Wing Section

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Experimental Study on Efficiency of Floating Vertical Axis Wind Turbine with Variable-Pitch

Journal of Ocean Engineering and Technology ◽

10.26748/ksoe.2018.6.32.3.202 ◽

2018 ◽

Vol 32 (3) ◽

pp. 202-207

Author(s):

Jae-Heui Kim ◽

Hyo-Jae Jo ◽

Jae-Hyuk Hwang ◽

Min-Suk Jang ◽

Byeong-Seong Lee

Keyword(s):

Experimental Study ◽

Wind Turbine ◽

Vertical Axis ◽

Vertical Axis Wind Turbine ◽

Variable Pitch

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Variable pitch control for vertical-axis wind turbines

Wind Engineering ◽

10.1177/0309524x18756972 ◽

2018 ◽

Vol 42 (2) ◽

pp. 128-135 ◽

Cited By ~ 3

Author(s):

S Horb ◽

R Fuchs ◽

A Immas ◽

F Silvert ◽

P Deglaire

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Wind Turbine ◽

Three Dimensional ◽

Vertical Axis ◽

Two Dimensional ◽

Vertical Axis Wind Turbine ◽

Horizontal Axis Wind Turbine ◽

Variable Pitch ◽

Pitch Control

NENUPHAR aims at developing the next generation of large-scale floating offshore vertical-axis wind turbine. To challenge the horizontal-axis wind turbine, the variable blade pitch control appears to be a promising solution. This article focuses on blade pitch law optimization and resulting power and thrust gain depending on the operational conditions. The aerodynamics resulting from the implementation of a variable blade pitch control are studied through numerical simulations, either with a three-dimensional vortex code or with two-dimensional Navier-stokes simulations (two-dimensional computational fluid dynamics). Results showed that the three-dimensional vortex code used as quasi-two-dimensional succeeded to give aerodynamic loads in very good agreement with two-dimensional computational fluid dynamics simulation results. The three-dimensional-vortex code was then used in three-dimensional configuration, highlighting that the variable pitch can enhance the vertical-axis wind turbine power coefficient ( Cp) by more than 15% in maximum power point tracking mode and decrease it by more than 75% in power limitation mode while keeping the thrust below its rated value.

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EXPERIMENTAL AND NUMERICAL EVALUATION OF PERFORMANCE OF A VARIABLE PITCH VERTICAL AXIS WIND TURBINE

Journal of Energy Resources Technology ◽

10.1115/1.4051896 ◽

2021 ◽

pp. 1-14

Author(s):

Owaisur Rahman Shah ◽

Azfar Jamal ◽

Talha Irfan Khan ◽

Usama Waleed Qazi

Keyword(s):

Wind Turbine ◽

Azimuthal Angle ◽

Research Work ◽

Vertical Axis ◽

Experimental Results ◽

Vertical Axis Wind Turbine ◽

Horizontal Axis Wind Turbine ◽

Variable Pitch ◽

Lift And Drag ◽

Fixed Pitch

Abstract The research work depicts the study of the comparison of a 1kW Fixed Pitch Vertical Axis Wind Turbine (VAWT) and a Variable Pitch VAWT via analytical, numerical and experimental results. Being an emerging technology, wind turbine is becoming a source of attraction for the researchers. The VAWT in comparison to the Horizontal Axis Wind Turbine (HAWT), has shown numerous benefits. The fundamental purpose of this work is to maximize the output power and output torque of the wind turbine. For achieving an improved output, a novel and unique mechanism, termed as pitching mechanism, is employed that follows the variable pitch concept. The mathematical modelling was done for the straight blade variable pitch VAWT as well as for the fixed rotor. The four bar mechanism was developed, to execute the variable pitch mechanism, and implemented in the form of the CAD model. A scaled down 3D Model of the rotor was manufactured using 3D printing technique. The aerodynamic forces such as lift and drag were measured upon the rotor as per the testing on the rotor in the wind tunnel. CFD simulations were run for the fixed pitch as well as the variable pitch rotor. The transient analysis was performed for the azimuthal angle ranging from 0 to 360 degrees and for a pitch angle varying from +25 to-25 degrees in ANSYS software. The comparative study was undertaken, keeping in view the analytical, simulation and experimental results. A worthy agreement was observed between analytical, software and experimental results and a promising increase in power and torque was observed due the introduction of the variable pitch mechanism. The power produced by the variable pitch design showed a significant increase in the power production as compared to the fixed pitch design. The numerical and experimental values of cp for the variable pitch design were quite comparable.

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