scholarly journals Orthogonal Analysis Based Performance Optimization for Vertical Axis Wind Turbine

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Lei Song ◽  
Hong-Zhao Liu ◽  
Zong-Xiao Yang
Keyword(s):  
Wind Turbine ◽  
Performance Optimization ◽  
Structural Parameters ◽  
Vertical Axis ◽  
Optimization Method ◽  
Energy Utilization ◽  
Geometrical Shape ◽  
Vertical Axis Wind Turbine ◽  
Traditional Research ◽  
Orthogonal Analysis

Geometrical shape of a vertical axis wind turbine (VAWT) is composed of multiple structural parameters. Since there are interactions among the structural parameters, traditional research approaches, which usually focus on one parameter at a time, cannot obtain performance of the wind turbine accurately. In order to exploit overall effect of a novel VAWT, we firstly use a single parameter optimization method to obtain optimal values of the structural parameters, respectively, by Computational Fluid Dynamics (CFD) method; based on the results, we then use an orthogonal analysis method to investigate the influence of interactions of the structural parameters on performance of the wind turbine and to obtain optimization combination of the structural parameters considering the interactions. Results of analysis of variance indicate that interactions among the structural parameters have influence on performance of the wind turbine, and optimization results based on orthogonal analysis have higher wind energy utilization than that of traditional research approaches.

A Review on the New Structure of Savonius Wind Turbines

2012 ◽  
Vol 608-609 ◽  
pp. 467-478 ◽  
Author(s):  
Zhi Peng Tang ◽  
Ying Xue Yao ◽  
Liang Zhou ◽  
Bo Wen Yu
Keyword(s):  
Wind Turbine ◽  
Structural Parameters ◽  
Vertical Axis ◽  
Low Noise ◽  
Energy Utilization ◽  
Vertical Axis Wind Turbine ◽  
Tidal Power ◽  
Useful Knowledge ◽  
Structural Improvement ◽  
Savonius Wind Turbine

This paper summarizes the research results of the structural parameters which have effects on the performance of Savonius wind turbine. Savonius wind turbine being used in wind power and tidal power belongs to vertical axis wind turbine (VAWT). Recently, more and more research have placed on it for its advantages such as: being able to accept wind from any direction, long fatigue life of the blades, high starting torque, wide working wind speed range, easy to install, manufacture and maintain and low noise etc. The performance of Savonius wind turbine is affected by many factors. Different structural parameters can bring huge differences in turbine performance. Especially the differences in the maximum wind energy utilization (Cp-max) can be more than 30% with different structure. Many new turbines get higher Cp-max by improving the structural parameters. In this paper, the structural improvement information of Savonius wind turbine is summarized in order to provide useful knowledge for the researchers in the structural design and improvement.

scholarly journals Design of Vertical Axis Wind Turbine Darrieus Type (H- Darrieus Rotor) of 0.20 KW from the Software Topsolid

2020 ◽  
pp. 52-70
Author(s):  
Hagninou E. V. Donnou ◽  
Drissa Boro ◽  
Donald Abode ◽  
Brunel Capo-Chichi ◽  
Aristide B. Akpo
Keyword(s):  
Wind Turbine ◽  
Permanent Magnets ◽  
Aerodynamic Force ◽  
Low Cost ◽  
Coastal Region ◽  
Vertical Axis ◽  
Digital Design ◽  
Three Dimensions ◽  
Geometrical Shape ◽  
Vertical Axis Wind Turbine

The design of a vertical axis wind turbine (Darrieus type) adapted to the site of Cotonou in the coastal region of Benin was investigated. The statistical study of winds based on the Weibull distribution was carried out on hourly wind data measured at 10 m above the ground by the Agency for the Safety of Air Navigation in Africa and Madagascar (ASECNA) over the period from January 1981 to December 2014. The geometrical and functional parameters of the wind turbine were determined from different models and aerodynamic approaches. The digital design and assembly of the wind turbine components were carried out using the TOPSOLID software. The designed wind turbine has a power of 200W. It is equipped with a synchronous generator with permanent magnets and has three wooden blades with NACA 0015 profile. The optimal coefficient of lift and drag were estimated respectively at 0.7832 and 0.01578. The blades are characterized by an optimum angle of attack estimated at 6.25° with a maximum fineness of 49.63. Their length is 4 m and the maximum thickness is estimated at 0.03 m with a chord of 0.20 m. The volume and mass are respectively equal to 0.024 m3 and 36 kg. The aerodynamic stall occurs at an attack angle of 14.25°. The aerodynamic force exerted on these blades is estimated to be 240 N. The aerodynamic stresses exerted on the rotor are estimated at 15 864 504 Pa and the solidity at 0.27. The efficiency of the wind turbine is 0.323. From TOPSOLID, the geometrical shape of each component of the wind turbine is represented in three dimensions. The assembly allowed to visualizing the wind turbine after export via its graphical interface. The quantity of annual energy produced by the wind turbine was estimated at 0.85 MWh. This study is the first to be carried out in the study area and could reduce the technological dependence of vertical axis wind turbines and their import for low cost energy production.

Two-Dimensional Computational Fluid Dynamics Study on the Performance of Twin Vertical Axis Wind Turbine With Deflector

2020 ◽  
Vol 142 (8) ◽  
Author(s):  
Yichen Jiang ◽  
Peidong Zhao ◽  
Li Zou ◽  
Zhi Zong ◽  
Kun Wang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wind Turbine ◽  
Cfd Simulation ◽  
Vertical Axis ◽  
Energy Utilization ◽  
Offshore Wind ◽  
Two Dimensional ◽  
Vertical Axis Wind Turbine ◽  
Local Flow

Abstract The offshore wind industry is undergoing a rapid development due to its advantage over the onshore wind farm. The vertical axis wind turbine (VAWT) is deemed to be potential in offshore wind energy utilization. A design of the offshore vertical axis wind turbine with a deflector is proposed and studied in this paper. Two-dimensional computational fluid dynamics (CFD) simulation is employed to investigate the aerodynamic performance of wind turbine. An effective method of obtaining the blade’s angle of attack (AoA) is introduced in CFD simulation to help analyze the blade aerodynamic torque variation. The numerical simulations are validated against the measured torque and wake velocity, and the results show a good agreement with the experiment. It is found that the blade instantaneous torque is correlated with the local AoA. Among the three deflector configurations, the front deflector leads to favorable local flow for the blade, which is responsible for the improved performance.

The Aerodynamic Analysis of Helical-Type VAWT With Semi Empirical and CFD Method

2019 ◽  
Author(s):  
Ying Guo ◽  
Liqin Liu ◽  
Xinxin Lv ◽  
Yougang Tang
Keyword(s):  
Wind Turbine ◽  
Output Power ◽  
Structural Parameters ◽  
Vertical Axis ◽  
Empirical Method ◽  
Parameter Analysis ◽  
Vertical Axis Wind Turbine ◽  
Parameters Analysis ◽  
Cfd Method ◽  
Semi Empirical

Abstract Comparing to Φ-type and H-type VAWT (Vertical Axis Wind Turbine), the amplitude changes of the aerodynamics acting on Helical-type VAWT are much smaller, so Helical-type VAWT has advantages in steady output power and avoiding fatigue of structure. Considering the characteristic of helical-type VAWT, this paper modifies the semi empirical method of calculating aerodynamic loads and compares with CFD results. A comparison is presented between CFD results and experiment results to confirm the model used in CFD. Single parameter analysis and muti-parameters analysis are carried out to study the influence of structural parameters on the dynamic torque. Based on an objective output power as 5MW, the parameters of wind turbine are adjusted, and optimal values of these parameters are determined.

Dynamic Analysis of a Truss Spar-Type Floating Foundation for 5 MW Vertical-Axis Wind Turbine

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Liqin Liu ◽  
Weichen Jin ◽  
Ying Guo
Keyword(s):  
Wind Turbine ◽  
Structural Parameters ◽  
Vertical Axis ◽  
Rotational Frequency ◽  
Wave Loads ◽  
Vertical Axis Wind Turbine ◽  
Mean Values ◽  
Floating Foundation ◽  
Truss Spar ◽  
Foundation Parameters

This paper studies the dynamic characteristic of the truss Spar-type floating foundation used to support the offshore vertical-axis wind turbine (VAWT). The effects of changes in foundation structural parameters on its motions were evaluated. The results show that radius of the buoyancy tank, radius of the upper mechanical tank, interval of the center of gravity and center of buoyancy, and height of the upper mechanical tank have important effects on the heave and pitch motions of the foundation. Two sets of foundation parameters (FS-1 and FS-2) were selected to support the 5 MW Darrieus wind turbine. The motion performances of the two floating VAWTs, S-1 (the VAWT supported by FS-1) and S-2 (the VAWT supported by FS-2), were analyzed and compared. It was observed that the amplitudes of the heave and pitch motions of the floating VAWT depend on the wave loads; the mean values of the heave and pitch motions depend on the aerodynamic loads. The floating VAWT S-2 had better motion performance; its heave and pitch motions were all small. The heave frequencies of the floating VAWT were equal to the wave frequencies. For the pitch frequencies, there is a component of the rotor rotational frequency (0.175 Hz) for cases LC1 to LC4, while the amplitudes of the twice-per-revolution (2P) response are far smaller than the amplitudes of the wave response.

Design and Performance Analysis of Distributed Equal Angle Spiral Vertical Axis Wind Turbine

2020 ◽  
Vol 14 (1) ◽  
pp. 120-132
Author(s):  
Li Zheng ◽  
Zhang Wenda ◽  
Han Ruihua ◽  
Tian Yongsheng
Keyword(s):  
Wind Speed ◽  
Wind Energy ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Vertical Axis ◽  
Energy Utilization ◽  
Normal Operation ◽  
Utilization Rate ◽  
Speed Ratio ◽  
Vertical Axis Wind Turbine

Background: The wind turbine is divided into a horizontal axis and a vertical axis depending on the relative positions of the rotating shaft and the ground. The advantage of the choke wind turbine is that the starting torque is large and the starting performance is good. The disadvantage is that the rotation resistance is large, the rotation speed is low, the asymmetric flow occurs when the wind wheel rotates, the lateral thrust is generated, and the wind energy utilization rate is lowered. How to improve the wind energy utilization rate of the resistance wind turbine is an important issue to be solved by the wind power technology. Objective: The nautilus isometric spiral wind turbines studied in this paper have been introduced and analyzed in detail, preparing for the further flow analysis and layout of wind turbines, improving the wind energy utilization rate of wind turbines, introducing patents of other structures and output characteristics of its generator set. Methods: Combined with the flow field analysis of ANSYS CFX software, the numerical simulation of the new wind turbine was carried out, and the aerodynamic performance of the new vertical axis wind turbine was analyzed. The mathematical model and control model of the generator were established by the maximum power control method, and the accuracy of the simulation results was verified by the measured data. Results: The basic parameters of the new wind turbine tip speed ratio, torque coefficient and wind energy utilization coefficient are analyzed. Changes in wind speed, pressure and eddy viscosity were investigated. Three-dimensional distribution results of wake parameters such as wind speed and pressure are obtained. By simulating the natural wind speed, the speed and output current of the generator during normal operation are obtained. Conclusion: By analyzing the wind performance and power generation characteristics of the new wind turbine, the feasibility of the new wind turbine is determined, which provides reference and reference for the optimal design and development of the wind turbine structure.

Calculating the aerodynamics of vertical axis wind turbines

2012 ◽  
Vol 34 (3) ◽  
pp. 169-184 ◽  
Author(s):  
Hoang Thi Bich Ngoc
Keyword(s):  
Wind Turbine ◽  
Incidence Angle ◽  
Vertical Axis ◽  
Rotor Blades ◽  
Vertical Axis Wind Turbine ◽  
Horizontal Axis Wind Turbine ◽  
Velocity Triangle ◽  
Relationship Of ◽  
The Relationship

Vertical axis wind turbine technology has been applied last years, very long after horizontal axis wind turbine technology. Aerodynamic problems of vertical axis wind machines are discussible. An important problem is the determination of the incidence law in the interaction between wind and rotor blades. The focus of the work is to establish equations of the incidence depending on the blade azimuth, and to solve them. From these results, aerodynamic torques and power can be calculated. The incidence angle is a parameter of velocity triangle, and both the factors depend not only on the blade azimuth but also on the ratio of rotational speed and horizontal speed. The built computational program allows theoretically selecting the relationship of geometric parameters of wind turbine in accordance with requirements on power, wind speed and installation conditions.

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