Zobrazeno 1 - 10
of 172
pro vyhledávání: '"Yutaka HARA"'
Use of Dampers to Improve the Overspeed Control System with Movable Arms for Butterfly Wind Turbines
Autor:
Yutaka Hara, Hiroyuki Higami, Hiromitsu Ishikawa, Takeshi Ono, Shigenori Saito, Kenichiro Ichinari, Katsushi Yamamoto
Publikováno v:
Energies, Vol 17, Iss 11, p 2727 (2024)
To reduce the cost of small wind turbines, a prototype of a butterfly wind turbine (6.92 m in diameter), a small vertical-axis type, was developed with many parts made of extruded aluminum suitable for mass production. An overspeed control system wit
Externí odkaz:
https://doaj.org/article/415c6be8ae454a38a976311d4723b59f
Publikováno v:
Energies, Vol 16, Iss 19, p 6925 (2023)
Many vertical-axis wind turbines (VAWTs) require arms, which generally provide aerodynamic resistance, to connect the main blades to the rotating shaft. Three–dimensional numerical simulations were conducted to clarify the effects of a gap placed a
Externí odkaz:
https://doaj.org/article/df4d2314fa4d4cfd8f075bdaf160b9a3
Autor:
Yoshifumi Jodai, Yutaka Hara
Publikováno v:
Energies, Vol 16, Iss 3, p 1088 (2023)
To elucidate the wind-direction dependence of the rotor performance in closely spaced vertical-axis wind turbines, wind-tunnel experiments were performed at a uniform wind velocity. In the experiments, a pair/trio of three-dimensional printed model t
Externí odkaz:
https://doaj.org/article/0954e4d6943447bf8e38b084d20199ca
Publikováno v:
Energies, Vol 15, Iss 14, p 5200 (2022)
Recently, wind farms consisting of clusters of closely spaced vertical-axis wind turbines (VAWTs) have attracted the interest of many people. In this study, a method using a wake model to predict the flow field and the output power of each rotor in a
Externí odkaz:
https://doaj.org/article/3469d0e5a02d4c36b229473f4aa633cb
Publikováno v:
Energies, Vol 15, Iss 11, p 4130 (2022)
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 inv
Externí odkaz:
https://doaj.org/article/f481e795cdc44e3fa5a7bfa871523354
Autor:
Yoshifumi Jodai, Yutaka Hara
Publikováno v:
Energies, Vol 14, Iss 23, p 7874 (2021)
This study aimed to determine the optimal rotor spacing of two vertical-axis wind turbines, which are simulated by miniature models arranged side-by-side with a relatively low aspect ratio. Wind tunnel experiments with a pair of 3-D printed model rot
Externí odkaz:
https://doaj.org/article/461575f87bad47208ad56e44a084384f
Numerical Analysis of the Dynamic Interaction between Two Closely Spaced Vertical-Axis Wind Turbines
Publikováno v:
Energies, Vol 14, Iss 8, p 2286 (2021)
To investigate the optimum layouts of small vertical-axis wind turbines, a two-dimensional analysis of dynamic fluid body interaction is performed via computational fluid dynamics for a rotor pair in various configurations. The rotational speed of ea
Externí odkaz:
https://doaj.org/article/83feac0a5aba4e2aa25fbb34d15e630d
Publikováno v:
Energies, Vol 12, Iss 11, p 2106 (2019)
Most vertical axis wind turbines (VAWTs) need arms connecting the blades with the rotational axis. The arms increase the power loss of VAWTs; however, the distribution between the pressure and friction influences and their degrees of influence have n
Externí odkaz:
https://doaj.org/article/e2f3d288fdd344bca36197bf2c22ff24
Autor:
Yutaka HARA, Akira SHIOZAKI, Hiroaki NISHIONO, Shigenori SAITO, Keisuke SHIOYA, Takahiro SUMI, Yuhei MATSUBARA, Yoshiyuki YASUMOTO, Katsuhiro TAKAGAKI, Shohei KOGO
Publikováno v:
Journal of Fluid Science and Technology, Vol 11, Iss 2, Pp JFST0010-JFST0010 (2016)
To reduce costs involved in manufacturing small wind turbines, an aluminum circular-blade butterfly wind turbine (ACBBWT) has been developed, in which four blades of the turbine were extruded and bent to shape then attached directly to a rotating fla
Externí odkaz:
https://doaj.org/article/f320dd256cea4e33832e494f969e7fd7
Publikováno v:
Journal of Fluid Science and Technology, Vol 6, Iss 4, Pp 685-699 (2011)
The flow field of a free square jet generated from an unsteady wind tunnel with a step-like axial velocity variation was measured using an ultrasonic anemometer. Three-dimensional velocity vector fields were synthesized by computational modeling from
Externí odkaz:
https://doaj.org/article/e4aaaf477cd24e049b5895a45e2c3f89