ID 14158
File
Authors
Furukawa, Masaru Faculty of Engineering, Tottori University Researchers DB KAKEN
Hara, Yutaka Faculty of Engineering, Tottori University Researchers DB KAKEN
Jodai, Yoshifumi Department of Mechanical Engineering, Kagawa National Institute of Technology (KOSEN)
Keywords
vertical-axis wind turbine
phase synchronization
analytical model
Bernoulli’s law
Abstract
The phase-synchronized rotation of a pair of closely spaced vertical-axis wind turbines has been found in wind tunnel experiments and computational fluid dynamics (CFD) simulations. During phase synchronization, the two wind turbine rotors rotate inversely at the same mean angular velocity. The blades of the two rotors pass through the gap between the turbines almost simultaneously, while the angular velocities oscillate with a small amplitude. A pressure drop in the gap region, explained by Bernoulli’s law, has been proposed to generate the interaction torque required for phase synchronization. In this study, an analytical model of the interaction torques was developed. In our simulations using the model, (i) phase synchronization occurred, (ii) the angular velocities of the rotors oscillated during the phase synchronization, and (iii) the oscillation period became shorter and the amplitude became larger as the interaction became stronger. These observations agree qualitatively with the experiments and CFD simulations. Phase synchronization was found to occur even for a pair of rotors with slightly different torque characteristics. Our simulation also shows that the induced flow velocities influence the dependence of the angular velocities during phase synchronization on the rotation directions of the rotors and the distance between the rotors.
Publisher
MDPI
Content Type
Journal Article
Link
EISSN
19961073
Journal Title
ENERGIES
Volume
15
Issue
11
Published Date
2022-06
Publisher-DOI
Text Version
Publisher
Rights
(C) 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Citation
Furukawa, Masaru, Hara Yutaka, Jodai Yoshifumi. Analytical Model for Phase Synchronization of a Pair of Vertical-Axis Wind Turbines. Energies 2022, 15(11), 4130. https://doi.org/10.3390/en15114130.
Department
Faculty of Engineering/Graduate School of Engineering
Language
English