1218 Numerical Analysis about the Optimal Dimension of Endplates of Straight-Blade Vertical Axis Wind Turbine

2016 ◽  
Vol 2016.54 (0) ◽  
pp. _1218-1_-_1218-2_
Author(s):  
Yutaka HARA ◽  
Yuuki FURUKAWA ◽  
Takahiro SUMI ◽  
Hiromichi AKIMOTO ◽  
Shigeo YOSHIDA
Keyword(s):  
Numerical Analysis ◽  
Wind Turbine ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Optimal Dimension ◽  
Straight Blade

Numerical Analysis of Airfoils Used for Vertical Axis Wind Turbine

2012 ◽  
Author(s):  
N. C. Uzarraga-Rodriguez ◽  
A. Gallegos-Muñoz ◽  
Maria T. Parra-Santos ◽  
Juan M. Belman-Flores
Keyword(s):  
Numerical Analysis ◽  
Wind Turbine ◽  
Stokes Equations ◽  
Numerical Study ◽  
Twist Angle ◽  
Vertical Axis ◽  
Power Coefficient ◽  
Vertical Axis Wind Turbine ◽  
Angle Variation ◽  
Straight Blade

A numerical analysis of a three-bladed straight vertical axis wind turbine with NACA0015 airfoils-shaped is presented. The effect generated on the moment coefficient and power coefficient of the wind turbine rotor by the twist angle variation at the chord ends was analyzed. The configurations included the variation of blade twist angle of 15° and 30° located at 70%, 80% and 90% of chord length from leading end of the straight blade. The numerical study was developed in a commercial Computational Fluid Dynamics (CFD) using FLUENT®. This code allows to solve the Reynolds averaged Navier-Stokes equations and the transport equations of the turbulence quantities. The results show the aerodynamic performance for each configuration of the blade twist angle in the wind turbine, and are compared with data obtained from straight blade without twist angle. The wind turbine performance decrease about 67% as the blade twist angle increases, due to an increment in the drag force causing a negative moment against the rotation of vertical axis wind turbine. Also, the surface pressure distribution in a VAWT’s is presented.

Modeling dynamic stall of a straight blade vertical axis wind turbine

2015 ◽  
Vol 57 ◽  
pp. 144-158 ◽  
Author(s):  
K.M. Almohammadi ◽  
D.B. Ingham ◽  
L. Ma ◽  
M. Pourkashanian
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Dynamic Stall ◽  
Vertical Axis Wind Turbine ◽  
Straight Blade

Numerical Analysis of a Rooftop Vertical Axis Wind Turbine

2011 ◽  
Author(s):  
N. Cristobal Uzarraga-Rodriguez ◽  
A. Gallegos-Mun˜oz ◽  
J. Manuel Riesco A´vila
Keyword(s):  
Numerical Analysis ◽  
Wind Turbine ◽  
Numerical Study ◽  
Vertical Axis ◽  
Turbine Rotor ◽  
Aerodynamic Performance ◽  
Power Coefficient ◽  
Vertical Axis Wind Turbine ◽  
Sliding Mesh ◽  
Mesh Model

A numerical analysis of a rooftop vertical axis wind turbine (VAWT) for applications in urban area is presented. The numerical simulations were developed to study the flow field through the turbine rotor to analyze the aerodynamic performance characteristics of the device. Three different blade numbers of wind turbine are studied, 2, 3 and 4, respectively. Each one of the models was built in a 3D computational model. The effects generated in the performance of turbines by the numbers of blades are considered. A Sliding Mesh Model (SMM) capability was used to present the dimensionless form of coefficient power and coefficient moment of the wind turbine as a function of the wind velocity and the rotor rotational speed. The numerical study was developed in CFD using FLUENT®. The results show the aerodynamic performance for each configuration of wind turbine rotor. In the cases of Rooftop rotor the power coefficient increases as the blade number increases, while in the case of Savonius rotor the power coefficient decrease as the blades number increases.

OS0204 Performance calculation of vertical axis wind turbine with straight blade for air-bone wind turbine

2016 ◽  
Vol 2016.22 (0) ◽  
pp. _OS0204-1_-_OS0204-2_
Author(s):  
Yusuke MARUYAMA ◽  
Hironori A. FUJII ◽  
Hiroki T ENDO ◽  
Kazuichi SEKI ◽  
Masahiro MATSUI
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Straight Blade ◽  
Performance Calculation

A numerical analysis of unsteady inflow wind for site specific vertical axis wind turbine: A case study for Marsabit and Garissa in Kenya

2015 ◽  
Vol 76 ◽  
pp. 648-661 ◽  
Author(s):  
David Wafula Wekesa ◽  
Cong Wang ◽  
Yingjie Wei ◽  
Joseph N. Kamau ◽  
Louis Angelo M. Danao
Keyword(s):  
Numerical Analysis ◽  
Wind Turbine ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Site Specific ◽  
Unsteady Inflow

Wind Tunnel Test on Icing on a Straight Blade for Vertical Axis Wind Turbine

2011 ◽  
Vol 301-303 ◽  
pp. 1735-1739
Author(s):  
Yan Li ◽  
Fang Feng ◽  
Sheng Mao Li ◽  
Wen Qiang Tian ◽  
Kotaro Tagawa
Keyword(s):  
Wind Tunnel ◽  
Wind Turbine ◽  
Vertical Axis ◽  
Force Balance ◽  
Blade Surface ◽  
Vertical Axis Wind Turbine ◽  
Straight Blade ◽  
Drag And Lift Coefficients ◽  
Ice Accretions ◽  
Drag And Lift

Icing on blade surface of the wind turbine set in cold regions is a serious problem. To invest the mechanism of icing and ice accretion on blade surface, wind tunnel tests were carried out on a static straight blade used for the straight-bladed vertical axis wind turbine by using an icing wind tunnel. The icing and ice accretions on blade surface at some typical angles of attack were observed and recorded in a fixed wind speed and steady flow discharge. The mass of ice accretions on the surface of blade were also measured and compared. At the same time, the drag and lift coefficients were tested by a three-component force balance. Based on the test results, the factors affecting the mass and characteristic of ice accretions and the drag and lift coefficients of the straight blade were discussed.

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