Journal ArticleDOI
Analysis of aerodynamic load on straight-bladed vertical axis wind turbine
TLDR
In this article, a wind tunnel experiment for the evaluation of energy performance and aerodynamic forces acting on a small straight-bladed vertical axis wind turbine (VAWT) depending on several values of tip speed ratio was presented.Abstract:
This paper presents a wind tunnel experiment for the evaluation of energy performance and aerodynamic forces acting on a small straight-bladed vertical axis wind turbine (VAWT) depending on several values of tip speed ratio. In the present study, the wind turbine is a four-bladed VAWT. The test airfoil of blade is symmetry airfoil (NACA0021) with 32 pressure ports used for the pressure measurements on blade surface. Based on the pressure distributions which are acted on the surface of rotor blade measured during rotation by multiport pressure-scanner mounted on a hub, the power, tangential force, lift and drag coefficients which are obtained by pressure distribution are discussed as a function of azimuthally position. And then, the loads which are applied to the entire wind turbine are compared with the experiment data of pressure distribution. As a result, it is clarified that aerodynamic forces take maximum value when the blade is moving to upstream side, and become small and smooth at downstream side. The power and torque coefficients which are based on the pressure distribution are larger than that by torque meter.read more
Citations
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Journal ArticleDOI
Effect of number of blades on aerodynamic forces on a straight-bladed Vertical Axis Wind Turbine
TL;DR: In this article, the authors evaluated the aerodynamic forces depending on several numbers of blades in wind tunnel experiment and found that the power consumption of a straight-bladed VAWT decreases with the increase of number of blades.
Journal ArticleDOI
Study on power performance for straight-bladed vertical axis wind turbine by field and wind tunnel test
Qing'an Li,Takao Maeda,Yasunari Kamada,Junsuke Murata,Masayuki Yamamoto,Tatsuhiko Ogasawara,Kento Shimizu,Tetsuya Kogaki +7 more
TL;DR: In this article, the power and torque performance of a straight-bladed VAWT is investigated by wind tunnel experiment and field test, and the relationship between operating conditions and wind velocity is verified.
Journal ArticleDOI
Wind tunnel and numerical study of a straight-bladed vertical axis wind turbine in three-dimensional analysis (Part I: For predicting aerodynamic loads and performance)
Qing'an Li,Takao Maeda,Yasunari Kamada,Junsuke Murata,Toshiaki Kawabata,Kento Shimizu,Tatsuhiko Ogasawara,Alisa Nakai,Takuji Kasuya +8 more
TL;DR: In this paper, a straight-bladed VAWT (Vertical Axis Wind Turbine) with two straight blades was analyzed and compared in wind tunnel experiments and numerical analysis.
Journal ArticleDOI
Effect of solidity on aerodynamic forces around straight-bladed vertical axis wind turbine by wind tunnel experiments (depending on number of blades)
Qing'an Li,Takao Maeda,Yasunari Kamada,Junsuke Murata,Kento Shimizu,Tatsuhiko Ogasawara,Alisa Nakai,Takuji Kasuya +7 more
TL;DR: In this paper, the authors focused on evaluating the aerodynamic forces acting on a single blade, depending on the different numbers of blades in wind tunnel experiments, and the cross-sectional shape of the tested airfoil was a NACA0021.
Journal ArticleDOI
Effect of rotor aspect ratio and solidity on a straight-bladed vertical axis wind turbine in three-dimensional analysis by the panel method
Qing'an Li,Takao Maeda,Yasunari Kamada,Kento Shimizu,Tatsuhiko Ogasawara,Alisa Nakai,Takuji Kasuya +6 more
TL;DR: In this paper, the effect of rotor aspect ratio and solidity on the power performance of straight-bladed VAWT was investigated in three-dimensional analysis by panel method based on the assumption of an incompressible and potential flow coupled with a free vortex wake.
References
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BookDOI
Wind energy explained : theory, design, and application
TL;DR: In this article, a simplified HAWT rotor performance calculation procedure was proposed to evaluate the effect of drag and blade number on the optimum performance of wind turbine rotor performance, considering the Betz limit and the ideal horizontal axis wind turbine with wake rotation.
Journal ArticleDOI
Visualization by PIV of dynamic stall on a vertical axis wind turbine
TL;DR: In this paper, the aerodynamic behavior of a vertical axis wind turbine is analyzed by means of 2D particle image velocimetry (PIV), focusing on the development of dynamic stall at different tip speed ratios.
Effect of Blade Number on a Straight-Bladed Vertical-Axis Darreius Wind Turbine
TL;DR: In this paper, a mean for reducing the torque variation during the revolution of a vertical-axis wind turbine (VAWT) by increasing the blade number is presented, where flow field characteri stics are investigated at several values of tip speed ratio, allowing a quantification of the influence of blade number on flow geometric features and dynamic quantities.
Proceedings ArticleDOI
Efficiency improvement of a new vertical axis wind turbine by individual active control of blade motion
TL;DR: In this paper, the performance improvement of a straight-bladed vertical axis wind turbine is described, where the cycloidal blade system and the individual active blade control system are adopted, respectively, to improve the performance of the power generation system.
Journal Article
Numerical Analysis of the Influence of Airfoil Asymmetry on VAWT Performance
TL;DR: In this paper, the authors present a model for the evaluation of energy performance and aerodynamic forces acting on a three-bladed small vertical axis Darrieus wind turbine depending on blade chord curvature with respect to rotor axis.