scholarly journals A computational study on the aerodynamic performance of modified savonius wind turbine

2021 ◽  
pp. 100237
Author(s):  
M.H. Pranta ◽  
M.S. Rabbi ◽  
M.M. Roshid
Keyword(s):  
Wind Turbine ◽  
Computational Study ◽  
Aerodynamic Performance ◽  
Savonius Wind Turbine

scholarly journals Effect of Blade Angle on Aerodynamic Performance of Archimedes Spiral Wind Turbine

2020 ◽  
Vol 78 (1) ◽  
pp. 122-136
Author(s):  
Andrew Maher Labib ◽  
Ahmed Farouk Abdel Gawad ◽  
Mofreh Melad Nasseif
Keyword(s):  
Experimental Study ◽  
Wind Turbine ◽  
Computational Study ◽  
Computational Simulation ◽  
Turbine Blades ◽  
Aerodynamic Performance ◽  
Small Scale ◽  
Rotational Axis ◽  
Blade Angle ◽  
Archimedes Spiral

Energy harvesting from wind in urban areas is an important solution to meet energy needs and environmental care. This study describes the effect of blade angle on the aerodynamic performance of small-scale Archimedes spiral-wind-turbine blades by computational simulation, which is experimentally validated. Archimedes wind turbine is classified as one of the HAWTs. The computational approach was used to predict the aerodynamic performance of the scaled-down rotor blades. Blade angle is defined by the angle between the rotational axis and the tip of the blade, which varied from 50° to 65° with an interval of 5°. The computational study was carried out using the ANSYS CFX 19 software for a steady incompressible flow. The performance parameters of the wind turbine, which are power and torque coefficients were explored for different blade angles. This was carried out for wind speed from 5 to 12 m/s with an interval of 1 m/s. In order to validate the results of the computational simulation, an experimental study was carried out using a scaled-down 3D-printed models. The experimental study concentrated on the effect of blade angle on the rotating speed for the different turbine models. Obviously, the results highlight that the maximum power coefficient has an inverse relation to the blade angle.

scholarly journals The Operation of a Three-Bladed Horizontal Axis Wind Turbine under Hailstorm Conditions—A Computational Study Focused on Aerodynamic Performance

Inventions ◽  
2021 ◽  
Vol 7 (1) ◽  
pp. 2
Author(s):  
Dimitra Douvi ◽  
Eleni Douvi ◽  
Dionissios P. Margaris
Keyword(s):  
Wind Turbine ◽  
Cross Sections ◽  
Computational Study ◽  
Three Dimensional ◽  
Aerodynamic Performance ◽  
Horizontal Axis ◽  
Discrete Phase Model ◽  
Horizontal Axis Wind Turbine ◽  
Ansys Fluent ◽  
Discrete Phase

The aim of this study is the aerodynamic degradation of a three-bladed Horizontal Axis Wind Turbine (HAWT) under the influence of a hailstorm. The importance and originality of this study are that it explores the aerodynamic performance of an optimum wind turbine blade during a hailstorm, when hailstones and raindrops are present. The commercial Computational Fluid Dynamics (CFD) code ANSYS Fluent 16.0 was utilized for the simulation. The first step was the calculation of the optimum blade geometry characteristics for a three-bladed rotor, i.e., twist and chord length along the blade, by a user-friendly application. Afterwards, the three-dimensional blade and the flow field domain were designed and meshed appropriately. The rotary motion of the blades was accomplished by the application of the Moving Reference Frame Model and the simulation of hailstorm conditions by the Discrete Phase Model. The SST k–ω turbulence model was also added. The produced power of the wind turbine, operating in various environmental conditions, was estimated and discussed. Contours of pressure, hailstone and raindrop concentration and erosion rate, on both sides of the blade, are presented. Moreover, contours of velocity at various cross sections parallel to the rotor are demonstrated, to understand the effect of hailstorms on the wake behavior. The results suggest that the aerodynamic performance of a HAWT degrades due to impact and breakup of the particles on the blade.

Aerodynamic Performance Analysis of Three Bladed Savonius Wind Turbine With Different Overlap Ratios and at Various Reynolds Number

2010 ◽  
Author(s):  
Mosfequr Rahman ◽  
Khandakar N. Morshed ◽  
Ahsan Mian
Keyword(s):  
Reynolds Number ◽  
Wind Tunnel ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Alternative Energy ◽  
Vertical Axis ◽  
Aerodynamic Performance ◽  
Small Scale ◽  
Scale Models ◽  
Savonius Wind Turbine

Considerable improvements in the aerodynamic performance of a vertical axis wind turbine (VAWT) can be achieved by integrating computational fluid dynamics (CFD) simulation and wind tunnel investigation in their design improvement. With the growing demand for energy worldwide, conventional sources are becoming more scarce and expensive. Wind is among the most popular and fastest growing sources of alternative energy in the world. It is an inexhaustible, indigenous resource, pollution-free, and available almost any time of the day, especially in coastal regions. Industry experts predict that, with proper development, wind energy could provide 20% of the nation’s energy needs. Vertical axis wind turbines (VAWTs) may be as efficient and practical as, and simpler, and significantly cheaper to build and maintain than, horizontal axis wind turbines (HAWTs). They have other inherent advantages; for example, they always face the wind. VAWTs include both a drag-type configuration, such as the Savonius rotor, and a lift-type configuration, such as the Darrieus rotor. The Savonius wind turbine is the simplest. Its operation depends on the difference in drag force when the wind strikes either the convex or concave part of its semi-cylindrical blades. It is good at self-starting and works independently of wind direction. However, its efficiency is relatively lower than that of the lift-type VAWTs. Due to its simple design and low construction cost, Savonius rotors are primarily used for water pumping and to generate wind power on a small scale and its large starting torque makes it suitable for starting other types of wind turbines that have inferior starting characteristics. Recently, some generators with high torque at low rotational speed, suitable for small-scale wind turbines, have been developed, suggesting that Savonius rotors may yet be used to generate electric power. The main goal of this research work is to improve the aerodynamic performance of the three bladed vertical axis Savonius wind turbine. Based on this goal, the objective of this project is to study the performance characteristics of the Savonius wind turbine scale models both experimentally and numerically. The turbine scale models will have different designs with different overlap ratios (ratio of gap between two adjacent blades and the rotor diameter) and without overlap within three blades. The experimental measurements and testing will be conducted in front of a low speed subsonic wind tunnel at different Reynolds number and the computational fluid dynamic (CFD) flow simulation around those design models will be performed by commercial CFD software FLUENT and GAMBIT.

scholarly journals Computational Study on the Aerodynamic Performance of Wind Turbine Airfoil Fitted with Coandă Jet

2013 ◽  
Vol 2013 ◽  
pp. 1-17 ◽  
Author(s):  
H. Djojodihardjo ◽  
M. F. Abdul Hamid ◽  
A. A. Jaafar ◽  
S. Basri ◽  
F. I. Romli ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Computational Study ◽  
Three Dimensional ◽  
Aerodynamic Performance ◽  
Cfd Modeling ◽  
Trailing Edge ◽  
Optimum Configuration ◽  
Wind Turbine Airfoil ◽  
Coanda Jet ◽  
And Control

Various methods of flow control for enhanced aerodynamic performance have been developed and applied to enhance and control the behavior of aerodynamic components. The use of Coandă effect for the enhancement of circulation and lift has gained renewed interest, in particular with the progress of CFD. The present work addresses the influence, effectiveness, and configuration of Coandă-jet fitted aerodynamic surface for improving lift andL/D, specifically for S809 airfoil, with a view on its incorporation in the wind turbine. A simple two-dimensional CFD modeling usingk-ɛturbulence model is utilized to reveal the key elements that could exhibit the desired performance for a series of S809 airfoil configurations. Parametric study performed indicates that the use of Coandă-jet S809 airfoil can only be effective in certain range of trailing edge rounding-off radius, Coandă-jet thickness, and momentum jet size. The location of the Coandă-jet was found to be effective when it is placed close to the trailing edge. The results are compared with experimental data for benchmarking. Three-dimensional configurations are synthesized using certain acceptable assumptions. A trade-off study on the S809 Coandă configured airfoil is needed to judge the optimum configuration of Coandă-jet fitted Wind-Turbine design.

Aerodynamic performance enhancement of a Savonius wind turbine using an axisymmetric deflector

2022 ◽  
Vol 220 ◽  
pp. 104882
Author(s):  
Hady Aboujaoude ◽  
Fabien Beaumont ◽  
Sébastien Murer ◽  
Guillaume Polidori ◽  
Fabien Bogard
Keyword(s):  
Wind Turbine ◽  
Performance Enhancement ◽  
Aerodynamic Performance ◽  
Savonius Wind Turbine

scholarly journals Wind Characterization By Three Blade Savonius Wind Turbine Using IoT

2020 ◽  
Vol 932 ◽  
pp. 012080
Author(s):  
H F Liew ◽  
Abd R Rosemizi ◽  
M. Z. Aihsan ◽  
I Muzamir ◽  
I Baharuddin
Keyword(s):  
Wind Turbine ◽  
Savonius Wind Turbine
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