Numerical Investigation to Assess an Optimal Blade Profile for the Drag Based Vertical Axis Wind Turbine

2013 ◽  
Author(s):  
Sukanta Roy ◽  
Ujjwal K. Saha
Keyword(s):  
Renewable Energy ◽  
Wind Energy ◽  
Wind Turbines ◽  
Energy Demand ◽  
Computational Study ◽  
Flow Behavior ◽  
Renewable Energy Sources ◽  
Vertical Axis ◽  
Small Scale ◽  
Vertical Axis Wind Turbine

Rapid depletion rate of fossil fuels with an increasing energy demand and their high emission are imposing the evolution activities in the arena of renewable energy. To meet the future demands of renewable energy sources, wind energy is a very promising concept. In this feature, the drag based vertical axis wind turbines (VAWTs) are suitable for small scale wind energy generation for decentralized locations. However, these turbines have low power and torque coefficients as compared to other wind turbines. Numerous blade shapes have been proposed till now to improve the performance of these turbines. In the present paper, a computational study has been performed to simulate the air-flow over different blade profiles using shear stress transport (SST) k–ω turbulence model. The results obtained are validated with the available experimental data. In the dynamic simulations, the power and torque coefficients are calculated considering the blade arc angle as the variable shape parameter. The effects of drag and lift forces on the variable blade shapes are also studied in static simulations at various angular positions. The present paper tries to demonstrate an effective computational methodology to predict the flow behavior around a drag based VAWT. Through this study, it has been found possible to select an optimal blade shape from the point of its aerodynamic performance.

scholarly journals Aerodynamic Simulations for Floating Darrieus-Type Wind Turbines with Three-Stage Rotors

Inventions ◽  
2020 ◽  
Vol 5 (2) ◽  
pp. 18
Author(s):  
Mohamed Amine Dabachi ◽  
Abdellatif Rahmouni ◽  
Eugen Rusu ◽  
Otmane Bouksour
Keyword(s):  
Wind Energy ◽  
Wind Turbines ◽  
Energy Demand ◽  
Fossil Fuels ◽  
Cost Effective ◽  
Vertical Axis ◽  
Offshore Wind ◽  
Critical Parameters ◽  
Vertical Axis Wind Turbine ◽  
Horizontal Axis Wind Turbines

Growing energy demand is causing a significant decrease in the world’s hydrocarbon stock in addition to the pollution of our ecosystem. Based on this observation, the search for alternative sorts of energy to fossil fuels is being increasingly explored and exploited. Wind energy is experiencing a very important development, and it offers a very profitable opportunity for exploitation since the wind is always available and inexhaustible. Several technical solutions exist to exploit wind energy, such as floating vertical axis wind turbines (F-VAWTs), which provide an attractive and cost-effective solution for exploiting higher resources of offshore wind in deep water areas. Recently, the use of the Darrieus vertical axis wind turbine (VAWT) offshore has attracted increased interest because it offers significant advantages over horizontal axis wind turbines (HAWTs). In this context, this article presents a new concept of floating Darrieus-type straight-bladed turbine with three-stage rotors. A double-multiple stream tube (DMST) model is used for aerodynamic simulations to examine several critical parameters, including, solidity turbine, number of blades, rotor radius, aspect ratio, wind velocity, and rotor height. This study also allows to identify a low solidity turbine (σ = 0.3), offering the best aerodynamic performance, while a two-bladed design is recommended. Moreover, the results also indicate the interest of a variable radius rotor, as well as the variation of the height as a function of the wind speed on the aerodynamic efficiency.

scholarly journals The Investigation of Savonius Type and Darrieus H Type Wind Turbine Simulation with Wind Speed Variable

2021 ◽  
Vol 1 (2) ◽  
pp. 19-26
Author(s):  
Wibby Aditya Putra Utama ◽  
Yohandri Bow ◽  
M. Syahirman Yusi
Keyword(s):  
Renewable Energy ◽  
Wind Speed ◽  
Wind Turbine ◽  
Energy Demand ◽  
Renewable Energy Sources ◽  
Electrical Energy ◽  
Vertical Axis ◽  
Renewable Energy Resources ◽  
Vertical Axis Wind Turbine ◽  
Fan Speed

The demand for electrical energy that continues to increase along with the advancement of civilization and also the increasing number of people as well as the reduced level of fulfillment and availability of non-renewable energy sources, it is necessary to have renewable energy resources that capable of fulfill these energy demand in a more environmental friendly. One of the natural energies that we can use is wind energy, which is easy to get and lasts continuously. This research examines the comparison of the power generated from the vertical axis wind turbine savonius type and darrieus H type. The wind that use in this research get from from the fan. The test is doing by varying the wind speed by adjusting the fan speed. The fan is directed to the wind turbine to rotate the wind turbine. To measure the wind speed produced by the fan, a digital anemometer is used. The result of this research is the relation data of voltage to rpm and voltage to wind speed of wind turbine.

scholarly journals Small Scale Vertical Axis Wind Turbine

2021 ◽  
Author(s):  
Sahishnukumar Shah
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Wind Turbine ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Electrical Power ◽  
Vertical Axis ◽  
Energy Sources ◽  
Small Scale ◽  
Vertical Axis Wind Turbine

The small-scale vertical axis wind turbine is designed and modeled in this project, considering all aspects of wind turbine such as Blade design, stator design, rotor design and converter system design. Electric Power has become a prime necessity for any country for economic development. The conventional fuel sources for power generation are depleting fast. The favorable alternatives are renewable energy sources. Although more invention has to be carried out in the field of renewable energy sources, every little effort in this direction may provide a solution to reach most economical power generation point. Hence the same topic was selected for Masters Project. The goal of this project is to design a small scale Vertical Axis Wind Turbine, which is capable of producing electrical power even with low wind velocity. It can be placed on road dividers, sidetracks of train or remote places i.e. villages, military camps, where it is not economical to transmit power from power plants. Implementation of such project would reduce the dependence of an industry or remote houses, on electricity board.

scholarly journals Small Scale Vertical Axis Wind Turbine

2021 ◽  
Author(s):  
Sahishnukumar Shah
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Wind Turbine ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Electrical Power ◽  
Vertical Axis ◽  
Energy Sources ◽  
Small Scale ◽  
Vertical Axis Wind Turbine

The small-scale vertical axis wind turbine is designed and modeled in this project, considering all aspects of wind turbine such as Blade design, stator design, rotor design and converter system design. Electric Power has become a prime necessity for any country for economic development. The conventional fuel sources for power generation are depleting fast. The favorable alternatives are renewable energy sources. Although more invention has to be carried out in the field of renewable energy sources, every little effort in this direction may provide a solution to reach most economical power generation point. Hence the same topic was selected for Masters Project. The goal of this project is to design a small scale Vertical Axis Wind Turbine, which is capable of producing electrical power even with low wind velocity. It can be placed on road dividers, sidetracks of train or remote places i.e. villages, military camps, where it is not economical to transmit power from power plants. Implementation of such project would reduce the dependence of an industry or remote houses, on electricity board.

Study of a Vertical Axis Wind Turbine Using Fluid Particle Trajectory

2015 ◽  
Vol 799-800 ◽  
pp. 618-624
Author(s):  
Hirpa G. Lemu ◽  
Radostina Petrova ◽  
Assen Mihailov
Keyword(s):  
Wind Turbines ◽  
Energy Demand ◽  
Dynamic Pressure ◽  
Renewable Energy Sources ◽  
Turbine Blades ◽  
Vertical Axis ◽  
Energy Conversion Efficiency ◽  
Energy Sources ◽  
Vertical Axis Wind Turbine ◽  
Operation Conditions

Because of growing global concern for the increasing energy demand and the resulting environmental impact of fossil fuel based energy sources, renewable and environmental friendly energy sources are critically sought. Wind turbines are generally conceived as the key renewable energy sources, but more innovative solutions should augment the classical design and control of wind turbines in order to improve the energy conversion efficiency. For areas outside the integrated grid system and harsh operation conditions in particular vertical axis wind turbines show promising results. This turbine design is previously considered less efficient, and thus the performance has not been sufficiently documented. This paper attempts to contribute in better understanding of the wind flow around the rotor, and the way the rotor components react to the resulting pressure. The turbine is first modeled in 3D CAD system and simulated in a flow simulator in a virtual wind tunnel. Then the iso-lines of velocity and pressure distribution are plotted at selected sections of the turbine plane and the profiles are studied to characterize the fluctuations of the dynamic pressure and identify the vulnerable zone of the turbine blades and the structure.

scholarly journals The Evaluating of Wind Energy Potential of Osmaniye

2020 ◽  
pp. 38-48
Author(s):  
C. Kurt ◽  
B. Yelmen ◽  
M. T. Çakir
Keyword(s):  
Renewable Energy ◽  
Wind Energy ◽  
Wind Turbines ◽  
Energy Demand ◽  
Renewable Energy Sources ◽  
Electrical Energy ◽  
Energy Sources ◽  
Wind Effect ◽  
Energy Potential ◽  
Wind Potential

In parallel with the rapid increase in energy consumption today, it is known that conventional energy resources will be exhausted in the near future. Renewable energy sources are becoming more important today with decreasing available fossil resources and increasing energy needs. Wind energy is a clean and renewable energy source and has a remarkable importance. Wind energy is one of the most important renewable energy sources, whose technology and use have developed rapidly and their economy has become competitive with fossil energy sources. The systems that convert the energy in the wind into electrical energy are wind turbines. Wind turbines are classified according to their rotational axes, revolutions, powers, number of wings, wind effect, gear characteristics and installation locations. Energy has become one of the most important problems of the world countries today. Energy demand, as in many countries, is increasing with each passing day in Turkey. For this reason, solutions are sought to provide the energy needed in a timely, sufficient and reliable manner. The energy needed in these solution suggestions should be provided from domestic production opportunities and local energy sources as much as possible. In this study, usability of wind energy is tried to be revealed in Osmaniye province and its surroundings. When the wind map studies in Turkey are examined, in Osmaniye Province it has been found that the presence of wind potential, it is necessary to increase the number of WPP to benefit more from the potential of wind energy.

Optimized Small Vertical Axis Wind Turbine (VAWT), Phase I

2021 ◽  
Author(s):  
Moshe Zilberman ◽  
Abdelaziz Abu Sbaih ◽  
Ibrahim Hadad
Keyword(s):  
Wind Energy ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Cost Effective ◽  
Clean Energy ◽  
Vertical Axis ◽  
Low Noise ◽  
Power Coefficient ◽  
Vertical Axis Wind Turbine ◽  
Different Types

Abstract Wind energy has become an important resource for the growing demand for clean energy. In 2020 wind energy provided more than 6% of the global electricity demand. It is expected to reach 7% at the end of 2021. The installation growth rate of small wind turbines, though, is relatively slow. The reasons we are interested in the small vertical axis wind turbines are their low noise, environmentally friendly, low installation cost, and capable of being rooftop-mounted. The main goal of the present study is an optimization process towards achieving the optimal cost-effective vertical wind turbine. Thirty wind turbine models were tested under the same conditions in an Azrieli 30 × 30 × 90 cm low-speed wind tunnel at 107,000 Reynolds number. The different types of models were obtained by parametric variations of five basic models, maintaining the same aspect ratio but varying the number of bucket phases, the orientation angles, and the gaps between the vanes. The best performing turbine model was made of one phase with two vanes of non-symmetric bipolynomial profiles that exhibited 0.2 power coefficient, relative to 0.16 and 0.13 that were obtained for symmetrical polynomial and the original Savonius type turbines, respectively. Free rotation, static forces and moments, and dynamic moments and power were measured for the sake of comparison and explanation for the variations in performances of different types of turbines. CFD calculations were used to understand the forces and moment behaviors of the optimized turbine.

scholarly journals An Evaluation of Primary Energy Factor Values of Wind Turbines

Proceedings ◽  
2019 ◽  
Vol 16 (1) ◽  
pp. 9 ◽  
Author(s):  
Rokas Tamašauskas ◽  
Jolanta Šadauskienė ◽  
Patrikas Bruzgevičius ◽  
Dorota Anna Krawczyk
Keyword(s):  
Renewable Energy ◽  
Energy Consumption ◽  
Wind Energy ◽  
Wind Turbines ◽  
Renewable Energy Sources ◽  
Wind Farms ◽  
Energy Performance ◽  
Primary Energy ◽  
Energy Factor ◽  
Eu Member States

In order to fulfil the European Energy Performance of Buildings Directive (EPBD) requirements regarding the reduction of energy consumption in buildings, much attention has been paid to primary energy consumption. Wind energy is one type of primary energy. The analysis of the literature has revealed that wind energy is evaluated by different methods. Therefore, the aim of this article was to calculate the effect of the parameters of wind sources on the primary energy factor of wind turbines. In order to achieve this aim, the primary energy factor of 100 investigated wind turbines and 11 wind farms operating in Lithuania was calculated. Investigation results showed that the difference of the non-renewable primary energy factor between wind turbines due to capacity is 35%. This paper provides a recommendation with regard to EU energy efficiency and renewable energy directives and regulations: All EU member states should use the same or very similar methodology for the calculation of the primary energy factor of renewable and non-renewable energy sources.

scholarly journals Power Quality Investigation of Distribution Networks Embedded Wind Turbines

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
A. Elsherif ◽  
T. Fetouh ◽  
H. Shaaban
Keyword(s):  
Power Systems ◽  
Wind Energy ◽  
Electric Power ◽  
Power Quality ◽  
Wind Turbines ◽  
Distribution System ◽  
Renewable Energy Sources ◽  
Distribution Networks ◽  
Small Scale ◽  
Distributed Resources

In recent years a multitude of events have created a new environment for the electric power infrastructure. The presence of small-scale generation near load spots is becoming common especially with the advent of renewable energy sources such as wind power energy. This type of generation is known as distributed generation (DG). The expansion of the distributed generators- (DGs-) based wind energy raises constraints on the distribution networks operation and power quality issues: voltage sag, voltage swell, voltage interruption, harmonic contents, flickering, frequency deviation, unbalance, and so forth. Consequently, the public distribution network conception and connection studies evolve in order to keep the distribution system operating in optimal conditions. In this paper, a comprehensive power quality investigation of a distribution system with embedded wind turbines has been carried out. This investigation is carried out in a comparison aspect between the conventional synchronous generators, as DGs are widely in use at present, and the different wind turbines technologies, which represent the foresightedness of the DGs. The obtained results are discussed with the IEC 61400-21 standard for testing and assessing power quality characteristics of grid-connected wind energy and the IEEE 1547-2003 standard for interconnecting distributed resources with electric power systems.

DESIGN AND MODELING OF STRAIGHT-BLADE VERTICAL AXIS WIND TURBINE IN PAKISTAN

2021 ◽  
Author(s):  
S M Nazmuz Sakib
Keyword(s):  
Wind Turbines ◽  
Renewable Energy Sources ◽  
Vertical Axis ◽  
Energy Harvest ◽  
Vertical Axis Wind Turbine ◽  
Ansys Fluent ◽  
Straight Blade ◽  
The World ◽  
Horizontal Axis Wind Turbines ◽  
Radial Arrangement

Pakistan is one of those countries which has large potential of energy harvest from renewable energy sources and specially from wind. With the surge of global warming, the world is moving towards cleaner and viable sources of energy. Horizontal Axis Wind Turbines (HAWT) currently dominates the most of the wind power farm markets in the world but Vertical Axis Wind Turbines (VAWT) are also capable of harvesting large amounts of energy with benefits over the HAWTS. VAWTS do not need a control system to be pointed in the direction of wind because with its blade in radial arrangement, wind from any direction is useful. In this report, a Straight-Blade VAWT is designed for low speeds and its performance parameters are also identified for which the improvement of the VAWT will be obtained. Self-starting ability of VAWT is also analyzed and stress and vibration analysis will be investigated in ANSYS Fluent.

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