Savonius Type Vertical Axis Wind Research Articles

Simulation Study of the Effect of Wind Speed and Material Type on the Mechanical Properties of Vertical Axis Wind Turbine Blades

Wind energy is a clean and fast-growing renewable energy source that can be harnessed using wind turbines. In a Vertical Axis Wind Turbine (VAWT), turbine blades are a crucial factor, and their fiasco leads to wind turbine failure. However, references to VAWT blade structural analysis are very limited. Therefore, the study was carried out to determine the material with the lowest degree of deformation without structural failure. The finding could be used as a recommendation in the material selection of Savonius type vertical axis wind turbine blades. The study used materials such as aluminum, stainless steel, and fiberglass. The analysis was carried out by simulating using ANSYS software. Computational Fluid Dynamics (CFD) was used for determining the loading by providing speed variations at 3 m/s, 4 m/s, 5 m/s, and 6 m/s. The Finite Element Analysis (FEA) method was applied to analyze the structure, which shows the results of total deformation, equivalent stress, and safety factor. The total deformation results from the aluminum blades showed values of 109.55 mm, 190.73 mm, 299.25 mm, and 425.39 mm. The safety factor values of 4.4049, 2.5166, 1.5647, and 1.1348 revealed that it was also technically safe. Aluminum material can be recommended to be used in the manufacture of Savonius type vertical axis wind turbine blades because of its low price, lightweight, corrosion resistance, and sufficient durability, as revealed from the results of total deformation and safety factor values.

Aerodynamic study of a Savonius type vertical axis wind turbine for different axial positions between the blades

In this work we present a numerical study on the aerodynamic behavior of a vertical axis wind turbine of the Savonius type for different axial positions between the blades (overlap rates a/D). The study focuses on predicting the effect of the axial position of the blades to the torque coefficient and also to determine the dynamic field of the flow around the wind turbine for three cases overlap rates (a/D=0, a/D=0.16 and a/D=0.32). The study of the numerical simulation is carried out using a CFD calculation code with use of the finite volume method for the discretization of the differential equations. The equations governing the flow are solved by the SIMPLE algorithm using the K-epsilon model as the closure model.

Proposal of a Nature-Inspired Shape for a Vertical Axis Wind Turbine and Comparison of Its Performance with a Semicircular Blade Profile

In order to improve the efficiency of the Savonius type vertical axis wind turbine, the present work analyzes an improvement based on an innovative rotor geometry. The rotor blades are inspired on an organic shape mathematically analyzed, the Fibonacci’s spiral, presented in many nature systems as well as in art. This rotor was analyzed in a wind tunnel and through a CFD model. The power coefficients at different tip speed ratios (TSR) were characterized and compared for the Savonius turbine and two versions using the Fibonacci’s spiral. One of the proposed geometries improves the performance of the Savonius type. Particularly, the optimal configuration lead to an improvement in maximum power coefficient of 14.5% in the numerical model respect to a conventional Savonius turbine and 17.6% in the experimental model.

Global Optimization of Savonius-Type Vertical Axis Wind Turbine with Multiple Circular-Arc Blades Using Validated 3D CFD Model

Global Optimization of Savonius-Type Vertical Axis Wind Turbine with Multiple Circular-Arc Blades Using Validated 3D CFD Model

Conceptual Design and Structure Analysis of Savonius Vertical Axis Wind Turbine under Low Wind Speed

This research aims to investigate the stress distribution of Savonius type vertical axis wind turbine subjected to different wind speeds and different penetration positions. This research work involves applying 12 different wind speeds to the design generated from Pugh Method. The wind energies were applied to two positions, which were the edge of blade and uniformly distributed throughout the surface of the blade. SolidWorks 2015 software was used to draw the design of Savonius type vertical axis wind turbine. The drawing was imported to Inspire 2017 for analysis. The analysis is conducted to determine the stress distribution of the blade as wind energy applied to the blade. The results showed that the stress was higher in the area near to the rotor. The results also showed that the maximum displacement, maximum tension/compression stress, maximum shear stress, maximum von Mises stress, and maximum major principal stress of the blade increased as the force or pressure applied increased.

Examination of Savonius VAWT Blade Made of Stainless Steel and Aluminum using Ansys

This paper studies roof mounted savonius type Vertical Axis Wind Turbine systems with the goal of maximizing the efficiency and reducing the cost. The efficiency of the wind turbine depends on the material, shape and angle of the blade. So material plays an important role in the design of wind turbine. In this paper, Stainless Steel and Aluminum material are used to design savonius wind blades of 1 m height and 0.5 m chord length with 4 different arc radii. Modeling software Solid Works is used to model savonius wind blade and static structural and modal analysis of the Stainless Steel and Aluminum blades are done by using ANSYS Workbench software.

Examination of Structural and Dynamic Properties for Vertical Axis Wind Turbine Blade Made of Stainless Steel using Ansys

This paper studies the potential for installing savonius type Vertical Axis Wind Turbine systems with the goal of maximizing the efficiency and reducing the cost. The wind turbine efficiency depends on the material of the blade, angle of the blade and shape of the blade. So material of the wind turbine blade plays an important role in the design of wind turbine. In this paper, Stainless Steel is used to design savonius wind blades of 1 m height and 0.5 m chord length with 4 different arc radii. For this purpose, CAD modeling software Solid Works is used to model savonius wind blade and static structural and modal analysis of the Stainless Steel blade is done by using ANSYS Workbench software. Static structural analysis is used to determine stress, strain, deformation and displacement under static loading condition. The response of structure for dynamic loading is determined by modal analysis. It is used to determine the natural frequency and mode shape of vibration of any structure. This wind turbine is suitable to install in small houses in urban areas.

Effect of blade number and angle on the characteristics of the savonius type wind turbine

The savonius type vertical axis wind turbine can be operated in all wind directions, is low cut in speed and high in torque. Therefore, it is a potential source of energy in low wind areas. This research aimed to compare the performance of H-Savonius vertical axis wind turbine using blades numbers and blades angle. The turbine containing the blades numbers 4, 6, 8, 12, 16 and 18 with the blades angle being at -15°, -5°, 0°, 5° and 15°, respectively. Tests were undertaken at open type circuit wind tunnel. The results showed that the maximum power coefficient of the wind turbine at 16 blades and angle of 5° with an average of 0.26 which had 4.5 % increase in power compared to that of turbines the baseline. Finally, the cut in wind speed and the rev up time was 2.32 m/s and 25 s, respectively.

Analysis of the blade profile of the Savonius wind turbine using computational fluid dynamics

This study characterises the performance of the Savonius type vertical axis wind turbine (VAWT). The performance of the Savonius type VAWT can be characterised by power and coefficient of power. The main parameter considered for analysing the Savonius-type VAWT is the tip speed ratio (TSR). The mesh independency test and time independency test are carried out, in which the medium mesh and three degree of time step for rotation are selected. The Savonius wind turbine is analysed at various TSR ranging from 0.2 to5.0, in which TSR is 4.4, the performance of the turbine is high. Considering 4.4 TSR as the optimum one, the analysis of the Savonius type VAWT is carried out under various wind speed ranging from 1 to 10 m/s. From the analysis, the validation between numerical analysis and theoretical analysis is carried out and the efficiency of the Savonius type VAWT is increased to 50%.

3-Dimensional CFD simulation and analysis on performance of a micro-wind turbine resembling lotus in shape

To minimize the visual impact, a micro-wind turbine was first designed to imitate lotus based on the Savonius type vertical axis wind rotor. It mainly consists of static blades (hereinafter referred to as “guide blades”) and rotor blades (hereinafter referred to as “semi-circular blades”). In the present paper, researches neglected the impact of the guide blades on the performance of the micro-wind turbine. The performance of the micro-wind rotor with semi-circular blades was compared to that of Savonius rotors with either semi-cylindrical or helically twisted blades by computational fluid dynamics. The performance for the each section of the semi-circular blades was discussed and analyzed. The results show that the performance of the wind rotor with semi-circular blades is comparable to that of the semi-cylindrical wind rotor, and is slightly lower than that of the helically twisted wind rotor. However, the semi-circular wind rotor runs more smoothly.

Experimental and Computational Study of a Micro Vertical Axis Wind Turbine

With recent surge in fossil fuel prices and demand for cleaner renewable energy sources, wind turbines have become an alternative technology for power generation. Greenhouse gases such as carbon dioxide (CO2) emitted into the atmosphere contribute to the global climate change. This paper investigates the design of a Savonius type vertical axis wind turbine and its potential to generate power. To enhance the performance of the turbine, a flow restricting cowl is incorporated into the turbine. The airflow behavior of the turbine was investigated both experimentally and computationally. Three different configurations were studied (open position, centred position and a closed position). It is found that a partially cowled turbine in a centred and closed position resulted in a better performance of the turbine than a fully cowled turbine with the same configuration.