Decreasing Wear of Large Vertical Axis Wind Turbines by Employing a Multi-Level Turbine Concept

Multi Level

The chapter focuses on describing the author's own multi-level vertical axis wind turbine concept, putting emphasis on its specific features, the scope of conducted analyses, as well as general knowledge important to wind industry specialists, other people with an interest in wind energy, and engineers aspiring to achieve innovative results without needlessly complicating their design. Current results show a reduction of the maximum bending moment during a rotation at the bottom of a two level turbine of up to 19.7% after optimisation; at the same time an optimised turbine can achieve a reduction of maximum moment jump during a rotation at the bottom of a turbine of up to 73.4%. Further studies are currently being conducted, as both the study presented in this chapter and its continuations might have a definitive influence on the future development of the wind-energy sector.

Advances in Environmental Engineering and Green Technologies - Promoting Sustainable Practices through Energy Engineering and Asset Management ◽

Decreasing Wear of Large Vertical Axis Wind Turbines by Employing a Multi-Level Turbine Concept

10.4018/978-1-4666-8222-1.ch002 ◽

2015 ◽

pp. 22-34

Author(s):

Jan H. Wiśniewski

Keyword(s):

Wind Energy ◽

Wind Turbine ◽

Future Development ◽

Bending Moment ◽

Vertical Axis ◽

Energy Sector ◽

General Knowledge ◽

Multi Level

AIRFOIL SHAPED STRUTS FOR VERTICAL AXIS WIND TURBINE

International Journal of Engineering Applied Sciences and Technology ◽

10.33564/ijeast.2021.v05i09.025 ◽

2021 ◽

Vol 5 (9) ◽

Author(s):

Samyak Jain ◽

Gautam Singh ◽

Varun Yadav ◽

Rahul Bisht

Keyword(s):

Aspect Ratio ◽

Wind Energy ◽

Wind Turbine ◽

Energy Resource ◽

Bending Moment ◽

Clean Energy ◽

Vertical Axis ◽

Aspect Ratios ◽

Cost Of Energy

Currently, many countries are racing towards switching to clean energy resource (1). Among the options available Solar and Wind are two viable options that are economically feasible. Each day a new development is helping in bringing down the cost of energy extracted from these sources. With currently available technologies, solar energy is almost as expensive as the energy generated from burning coal, whereas wind energy is still slightly expensive (2). However, wind energy could be made cheaper by the use of a vertical axis wind turbine (3). However, structure is a major factor that is holding back the development of VAWTs with better efficiency (4). The efficiency of a VAWT depends upon its aspect ratio. Aspect Ratio is the ratio of the height of the blade to the diameter of the turbine. The lower the aspect ratio, the higher the efficiency (5). However, decreasing the AR would mean either increasing the diameter of the turbine or the height of the blade. In either case, the bending moment would increase on the struts, that connect the blades to the shaft. In this paper we propose, struts with airfoil cross-section. This is because, the lift generated by airfoil struts acts as additional support for the blade, thus increasing our ability to work at lower aspect ratios.

Performance Analysis of Casement Type Vertical Axis Wind Turbine

ASME 2013 Gas Turbine India Conference ◽

10.1115/gtindia2013-3752 ◽

2013 ◽

Cited By ~ 2

Author(s):

Sandeep S. Wangikar ◽

Sharad U. Jagtap ◽

Abhijeet B. Tarmude ◽

Abhishek S. Pore ◽

Sushil P. Shinde

Keyword(s):

Wind Speed ◽

Performance Analysis ◽

Wind Energy ◽

Wind Turbine ◽

Control Parameter ◽

Vertical Axis ◽

Renewable Energies ◽

Control Parameters ◽

Vertical Axis Wind Turbines

Increasing worldwide demand for electricity requires the need for harnessing different kinds of renewable energies like wind energy. An increase in prevalence of vertical axis wind turbine (VAWT) has renewed interest in developing the new configurations of vertical axis wind turbines for better performance. This paper describes the performance analysis of a casement type vertical axis wind turbine (CTVAWT). The model of CTVAWT has been manufactured and tested to predict the performance. The performance analysis of CTVAWT was carried out by varying the control parameters such as wind speed and casement angle. The effect of each control parameter on the response parameters i.e. torque and power have been analyzed (by conducting various experiments of CTVAWT).The torque and power increases with increase in casement angle up to 40 degrees further decrease with increase in casement angle. From this analysis the newly developed CTVAWT is working efficiently at 40 degrees.

Design of an Offshore Three-Bladed Vertical Axis Wind Turbine for Wind Tunnel Experiments

Volume 10: Ocean Renewable Energy ◽

10.1115/omae2017-61512 ◽

2017 ◽

Author(s):

Sukanta Roy ◽

Hubert Branger ◽

Christopher Luneau ◽

Denis Bourras ◽

Benoit Paillard

Keyword(s):

Wind Tunnel ◽

Wind Energy ◽

Wind Turbine ◽

Vertical Axis ◽

Offshore Wind ◽

Energy Market ◽

Offshore Wind Energy ◽

Wind Tunnel Experiments ◽

Vertical Axis Wind Turbines

The rapid shrinkage of fossil fuel sources and contrary fast-growing energy needs of social, industrial and technological enhancements, necessitate the need of different approaches to exploit the various renewable energy sources. Among the several technological alternatives, wind energy is one of the most emerging prospective because of its renewable, sustainable and environment friendly nature, especially at its offshore locations. The recent growth of the offshore wind energy market has significantly increased the technological importance of the offshore vertical axis wind turbines, both as floating or fixed installations. Particularly, the class of lift-driven vertical axis wind turbines is very promising; however, the existing design and technology is not competent enough to meet the global need of offshore wind energy. In this context, the project AEROPITCH co-investigated by EOLFI, CORETI and IRPHE aims at the development of a robust and sophisticated offshore vertical axis wind turbine, which would bring decisive competitive advantage in the offshore wind energy market. In this paper, simulations have been performed on the various airfoils of NACA 4-series, 5-series and Selig profiles at different chord Reynolds numbers of 60000, 100000 and 140000 using double multiple streamtube model with tip loss correction. Based on the power coefficient, the best suitable airfoil S1046 has been selected for a 3-bladed vertical axis wind turbine. Besides the blade profile, the turbine design parameters such as aspect ratio and solidity ratio have also been investigated by varying the diameter and chord of the blade. Further, a series of wind tunnel experiments will be performed on the developed wind turbine, and the implementation of active pitch control in the developed turbine will be investigated in future research.

Numerical design and modelling of a vertical axis wind turbine to extract wind energy from highways to power electric vehicle charging stations

10.1063/5.0033976 ◽

2020 ◽

Author(s):

K. R. Vishwaretha ◽

Sanjay Majjigesara Venkatesh ◽

W. Clavin Sequeira ◽

T. D. Teeshma ◽

T. B. Vishalakshi

Keyword(s):

Wind Energy ◽

Wind Turbine ◽

Electric Vehicle ◽

Vertical Axis ◽

Electric Vehicle Charging ◽

Numerical Design ◽

Vehicle Charging ◽

Charging Stations

Vertical axis wind turbine operation in icing conditions: A review study

Wind Engineering ◽

10.1177/0309524x211061828 ◽

2021 ◽

pp. 0309524X2110618

Author(s):

Syed Abdur Rahman Tahir ◽

Muhammad Shakeel Virk

Keyword(s):

Wind Turbine ◽

Wind Turbines ◽

Vertical Axis ◽

Electricity Production ◽

Horizontal Axis Wind Turbines ◽

Promising Solution ◽

Review Study ◽

Accretion Physics

Vertical Axis Wind Turbine (VAWT) can be a promising solution for electricity production in remote ice prone territories of high north, where good wind resources are available, but icing is a challenge that can affect its optimum operation. A lot of research has been made to study the icing effects on the conventional horizontal axis wind turbines, but the literature about vertical axis wind turbines operating in icing conditions is still scarce, despite the importance of this topic. This paper presents a review study about existing knowledge of VAWT operation in icing condition. Focus has been made in better understanding of ice accretion physics along VAWT blades and methods to detect and mitigate icing effects.

Design and performance evaluation of vertical axis wind turbine for wind energy harvesting at railway

World Journal of Science Technology and Sustainable Development ◽

10.1108/wjstsd-11-2020-0088 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Hashwini Lalchand Thadani ◽

Fadia Dyni Zaaba ◽

Muhammad Raimi Mohammad Shahrizal ◽

Arjun Singh Jaj A. Jaspal Singh Jaj ◽

Yun Ii Go

Keyword(s):

Wind Speed ◽

Energy Harvesting ◽

Wind Energy ◽

Wind Turbine ◽

High Speed ◽

Vertical Axis ◽

Speed Ratio ◽

Modeling Tools ◽

Content Type

PurposeThis paper aims to design an optimum vertical axis wind turbine (VAWT) and assess its techno-economic performance for wind energy harvesting at high-speed railway in Malaysia.Design/methodology/approachThis project adopted AutoCAD and ANSYS modeling tools to design and optimize the blade of the turbine. The site selected has a railway of 30 km with six stops. The vertical turbines are placed 1 m apart from each other considering the optimum tip speed ratio. The power produced and net present value had been analyzed to evaluate its techno-economic viability.FindingsComputational fluid dynamics (CFD) analysis of National Advisory Committee for Aeronautics (NACA) 0020 blade has been carried out. For a turbine with wind speed of 50 m/s and swept area of 8 m2, the power generated is 245 kW. For eight trains that operate for 19 h/day with an interval of 30 min in nonpeak hours and 15 min in peak hours, total energy generated is 66 MWh/day. The average cost saved by the train stations is RM 16.7 mil/year with battery charging capacity of 12 h/day.Originality/valueWind energy harvesting is not commonly used in Malaysia due to its low wind speed ranging from 1.5 to 4.5 m/s. Conventional wind turbine requires a minimum cut-in wind speed of 11 m/s to overcome the inertia and starts generating power. Hence, this paper proposes an optimum design of VAWT to harvest an unconventional untapped wind sources from railway. The research finding complements the alternate energy harvesting technologies which can serve as reference for countries which experienced similar geographic constraints.

Aerodynamic improvement of Darrieus wind turbine

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/897/1/012001 ◽

2021 ◽

Vol 897 (1) ◽

pp. 012001

Author(s):

Oleg Goman ◽

Andrii Dreus ◽

Anton Rozhkevych ◽

Krystyna Heti

Keyword(s):

Reynolds Number ◽

Wind Turbine ◽

Wind Turbines ◽

Structural Reliability ◽

Vertical Axis ◽

Vertical Wind ◽

Integral Approach ◽

Calculation Algorithm ◽

Vertical Axis Wind Turbines

Abstract Until recently, vertical-axis wind turbines are less extensively developed in wind energetics. At the same time, there are a number of advantages in turbines of such type like their independence from the change of wind direction, lower levels of aerodynamic and infrasound noises, higher structural reliability (compared to horizontal engines), etc. With these advantages, vertical-axis wind turbines demonstrate promising capacities. Inter alia, the productiveness of such turbines can be refined through the aerodynamic improvement of the structure and comprehensive optimization of the rotor geometry. The main purpose of the presented paper is to aerodynamically improve vertical wind turbine in order to increase the efficiency of wind energy conversion into electricity. Within the framework of the classical theory of impulses, this article presents a study of the effect of variation in Reynolds number on the general energy characteristics of a vertical-axis wind turbine with two blades. The integral approach makes it possible to use a single-disk impulse model to determine the main specific indicators of the system. The power factor was calculated based on the obtained value of the shaft torque factor, which in turn was determined by numerically integrating the total torque generated by the wind turbine. To calculate the test problem, we used the classic NACA airfoils: 0012, 0015, 0018 and 0021. The proposed calculation algorithm makes it possible not to indicate the Reynolds number and corresponding aerodynamic coefficients at the beginning of the calculation, but to recalculate it depending on the relative speed, position of the airfoil and the linear speed of the airfoil around the circumference. Proposed modern design techniques can be helpful for optimization of vertical wind turbines.

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

10.1115/gtindia2021-74879 ◽

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 ◽

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.

Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy ◽

Investigation of vertical axis wind turbine airfoil performance in rain

10.1177/0957650917721776 ◽

2017 ◽

Vol 232 (2) ◽

pp. 181-194 ◽

Cited By ~ 3

Author(s):

Zhenlong Wu ◽

Yihua Cao

Keyword(s):

Wind Turbine ◽

Wind Turbines ◽

Meteorological Condition ◽

Vertical Axis ◽

Turbine Performance ◽

Practical Design ◽

Wind Turbine Airfoil ◽

Naca 0015

Rainfall is a common meteorological condition that wind turbines may encounter and by which their performance may be affected. This paper comprehensively investigates the effects of rainfall on a NACA 0015 airfoil which is commonly used in vertical axis wind turbines. A CFD-based Eulerian–Lagrangian multiphase approach is proposed to study the static, rotating, and oscillating performances of the NACA 0015 airfoil in rainy conditions. It is found that for the different airfoil movements, the airfoil performance can seriously be deteriorated in the rain condition. Rain also causes premature boundary layer separations and more severe flow recirculations than in the dry condition. These findings seem to be the first open reports on rain effects on wind turbine performance and should be of some significance to practical design.