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Energies
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Advances in Small Wind Turbines
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Advances in Small Wind Turbines

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A3: Wind, Wave and Tidal Energy".

Deadline for manuscript submissions: closed (23 February 2022) | Viewed by 13679
Please submit your paper and select the Journal "Energies" and the Special Issue "Advances in Small Wind Turbines" via: https://susy.mdpi.com/user/manuscripts/upload?journal=energies. Please contact the journal editor Adele Min ([email protected]) before submitting.

Special Issue Editors

Dr. Michał Kulak

E-Mail Website
Guest Editor
Institute of Turbomachinery, Lodz University of Technology, 90-924 Lodz, Poland
Interests: small wind turbines; compressors; rotors; computational fluid dynamics; wind tunnel testing
Dr. Michał Lipian

E-Mail Website
Guest Editor
Institute of Turbomachinery, Lodz University of Technology, 90-924 Lodz, Poland
Interests: wind turbines; wind power; applied aerodynamics

Special Issue Information

Dear Colleagues,

It is our pleasure to announce that Energies is inviting submissions to a Special Issue on “Advances in Small Wind Turbines”. The worldwide “Green Deal” revolution increasingly favors the philosophy of distributed generation and its role in sustainable growth. As one of the key renewable energy sources, the wind turbine industry has responded to this call by increasing the role of domestic-scale machines. As horizontal- and vertical-axis wind turbines reduce their size, significant challenges arise. Low-Reynolds aerodynamics, efficient power transmission and conversion, robust control, noise generation, and economics are just several examples of the observed problems.

In the abovementioned spirit, Energies is organizing a Special Issue on the subject of small wind turbines. The topics available for discussion cover all stages of small wind turbine development and operation, starting from wind condition assessment, blade design, energy conversion system architecture, and choice of materials, through maintenance, contribution to hybrid systems, and the prosumer energy generation approach. The areas of interest for publication may include but are not limited to:

  • Computational modeling
  • Experimental testing
  • Blade optimization, airfoil design
  • Control systems, electronics
  • Noise generation, noise reduction
  • Structures/materials analysis
  • Distributed generation
  • Hybrid systems
  • Energy storage
  • Sustainability

Dr. Michał Kulak
Dr. Michał Lipian
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • small wind turbines
  • distributed generation
  • Low-Reynolds flow conditions
  • blade optimization
  • green energy

Published Papers (3 papers)

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Research

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14 pages, 4565 KiB  
Article
Blade Dimension Optimization and Performance Analysis of the 2-D Ugrinsky Wind Turbine
by Luke Sakamoto, Tomohiro Fukui and Koji Morinishi
Energies 2022, 15(7), 2478; https://0-doi-org.brum.beds.ac.uk/10.3390/en15072478 - 28 Mar 2022
Cited by 5 | Viewed by 5553
Abstract
With the increasing focus on renewable energy, there is a need to improve the efficiency of vertical-axis wind turbines (VAWTs). The Ugrinsky wind turbine is a type of VAWT, but there are few studies on this turbine. Previous studies have shown that the [...] Read more.
With the increasing focus on renewable energy, there is a need to improve the efficiency of vertical-axis wind turbines (VAWTs). The Ugrinsky wind turbine is a type of VAWT, but there are few studies on this turbine. Previous studies have shown that the maximum power coefficient of the Ugrinsky wind turbine reaches 0.170, which is 54.5% higher than that of the Savonius type (0.110), and this turbine maintains a high power coefficient over a wide range of tip speed ratios (TSR). In this study, the dimensions of the two semicircles of the Ugrinsky wind turbine were further optimized to obtain a higher power coefficient. An analysis of the effect of the blade dimensions on the performance was conducted. The flow around the turbine was simulated using the regularized lattice Boltzmann method. The geometry of the turbine was simulated using the virtual flux method for the Cartesian grid. The optimization was conducted in terms of the output power coefficient and the average value of the power coefficient for neighboring TSR to consider the fluctuation of the TSR. This study demonstrates that a closer vortex distance favored the growth of the vortex and improved the power coefficient. Full article
(This article belongs to the Special Issue Advances in Small Wind Turbines)
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18 pages, 28578 KiB  
Article
An Evaluation of Flicker Emissions from Small Wind Turbines
by Junji Kondoh and Daisuke Kodaira
Energies 2021, 14(21), 7263; https://0-doi-org.brum.beds.ac.uk/10.3390/en14217263 - 03 Nov 2021
Cited by 2 | Viewed by 1776
Abstract
It is well known that the output power from small wind turbines (SWTs) fluctuates noticeably more when compared to that from other types of dispersed generators, such as residential photovoltaic (PV) power generation systems. Thus, the degradation of voltage quality, such as flicker [...] Read more.
It is well known that the output power from small wind turbines (SWTs) fluctuates noticeably more when compared to that from other types of dispersed generators, such as residential photovoltaic (PV) power generation systems. Thus, the degradation of voltage quality, such as flicker emissions, when numerous SWTs are installed in a low-voltage distribution system is a particular concern. Nevertheless, practical examples of flicker emissions from small wind power facilities have not been made public. This paper aims to clarify the characteristics of flicker emissions by SWTs and their severity. The measurement results at the two selected sites indicate that the flicker emissions solely caused by variable-speed SWTs with a total power rating of ~20 kW are notably lower than the upper limit, and they are at their highest when the mean total output power is approximately 3/4 of the total power rating of small wind power facilities. Full article
(This article belongs to the Special Issue Advances in Small Wind Turbines)
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Review

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23 pages, 4091 KiB  
Review
Recent Development in the Design of Wind Deflectors for Vertical Axis Wind Turbine: A Review
by Altaf Hussain Rajpar, Imran Ali, Ahmad E. Eladwi and Mohamed Bashir Ali Bashir
Energies 2021, 14(16), 5140; https://0-doi-org.brum.beds.ac.uk/10.3390/en14165140 - 20 Aug 2021
Cited by 21 | Viewed by 5460
Abstract
Developments in the design of wind turbines with augmentation are advancing around the globe with the goal of generating electricity close to the user in built-up areas. This is certain to help lessen the power generation load as well as distribution and transmission [...] Read more.
Developments in the design of wind turbines with augmentation are advancing around the globe with the goal of generating electricity close to the user in built-up areas. This is certain to help lessen the power generation load as well as distribution and transmission network costs by reducing the distance between the user and the power source. The main objectives driving the development and advancement of vertical-axis wind turbines are increasing the power coefficient and the torque coefficient by optimizing the upstream wind striking on the rotor blades. Unlike horizontal-axis wind turbines, vertical axis turbines generate not only positive torque but also negative torque during operation. The negative torque generated by the returning blade is a key issue for vertical-axis wind turbines (VAWTs) that is counterproductive. Installation of wind deflectors for flow augmentation helps to reduce the negative torque generated by the returning blades as well as enhance the positive torque by creating a diversion in the upstream wind towards the forwarding blade during operation. This paper reviews various designs, experiments, and CFD simulations of wind deflectors reported to date. Optimization techniques for VAWTs incorporating wind deflectors are discussed in detail. The main focus of the review was on the installation position and orientation of the deflectors and their potential contribution to increasing the power coefficient. Topics for future study are suggested in the conclusion section of the paper. Full article
(This article belongs to the Special Issue Advances in Small Wind Turbines)
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