Numerical analysis on dynamic interaction between two closely spaced vertical axis wind turbines

Yamamoto, Shu; Hara, Yutaka; Jodai, Yoshifumi

doi:10.1299/jsmecs.2019.57.604

Cited by 2 publications

(4 citation statements)

References 20 publications

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“…However, further studies must be conducted for confirmation. In comparison with the results reported previously [20], the results obtained in this study exhibit a better convergence in the CFD calculation. For example, the difference in power between R1 and R2 in the CO layout is depicted in Figure 10a.…”

Section: Gap Dependence Of Parallel Layoutssupporting

confidence: 76%

“…In the case involving a short gap length (Figures 11a,c), the downwind rotor R2 was almost completely within the wake of the upwind rotor R1. As the two rotors rotated in the same direction in the TCO layout shown in Figure 11a, the flow speed in the region below the rotor pair became higher than In comparison with the results reported previously [20], the results obtained in this study exhibit a better convergence in the CFD calculation. For example, the difference in power between R1 and R2 in the CO layout is depicted in Figure 10a.…”

Section: Gap Dependence Of Tandem Layoutssupporting

confidence: 67%

“…This CFD analysis using the DFBI is equivalent to experiments involving variable-speed wind turbines. Although some of the results have been reported in several oral presentations [20][21][22][23] and in a commentary article [15], they are integrated herein and new considerations and results are included; furthermore, the calculation times of some cases were prolonged until the rotor angular velocities converged within the new criteria. The details of the revised data acquisition are explained in the following section.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of the Dynamic Interaction between Two Closely Spaced Vertical-Axis Wind Turbines

et al. 2021

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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 each turbine rotor (diameter: D = 50 mm) varies based on the equation of motion. First, the dependence of rotor performance on the gap distance (gap) between two rotors is investigated. For parallel layouts, counter-down (CD) layouts with blades moving downwind in the gap region yield a higher mean power than counter-up (CU) layouts with blades moving upwind in the gap region. CD layouts with gap/D = 0.5–1.0 yield a maximum average power that is 23% higher than that of an isolated single rotor. Assuming isotropic bidirectional wind speed, co-rotating (CO) layouts with the same rotational direction are superior to the combination of CD and CU layouts regardless of the gap distance. For tandem layouts, the inverse-rotation (IR) configuration shows an earlier wake recovery than the CO configuration. For 16-wind-direction layouts, both the IR and CO configurations indicate similar power distribution at gap/D = 2.0. For the first time, this study demonstrates the phase synchronization of two rotors via numerical simulation.

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Section: Gap Dependence Of Parallel Layoutssupporting

confidence: 76%

Section: Gap Dependence Of Tandem Layoutssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Analysis of the Dynamic Interaction between Two Closely Spaced Vertical-Axis Wind Turbines

et al. 2021

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show abstract

“…This CFD analysis using the DFBI is equivalent to experiments involving variable-speed wind turbines. Although some of the results have been reported in several oral presentations [19][20][21][22] and in a commentary article [14], they are integrated herein and new considerations and results are included; furthermore, the calculation times of some cases were prolonged until the rotor angular velocities converged within the new criteria. The details of the revised data acquisition are explained in the following section.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Dynamic Interaction Between Two Closely Spaced Vertical Axis Wind Turbines

Hara¹,

Jodai²,

Okinaga³

et al. 2021

Preprint

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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 each turbine rotor (diameter: D = 50 mm) varies based on the equation of motion. First, the dependence of rotor performance on the gap distance (gap) between two rotors is investigated. For parallel layouts, counter-down (CD) layouts with blades moving downwind in the gap region yield a higher mean power than counter-up (CU) layouts with blades moving upwind in the gap region. CD layouts with gap/D = 0.5–1.0 yield a maximum average power that is 23% higher than that of an isolated single rotor. Assuming isotropic bidirectional wind speed, co-rotating (CO) layouts with the same rotational direction are superior to the combination of CD and CU layouts regardless of the gap distance. For tandem layouts, the inverse-rotating configuration (IR) shows an earlier wake recovery than the CO configuration. For 16-wind-direction layouts, both the IR and CO configurations indicate similar power distribution at gap/D = 2.0. For the first time, this study demonstrates the phase synchronization of two rotors via numerical simulation.

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Numerical analysis on dynamic interaction between two closely spaced vertical axis wind turbines

Abstract: This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Cited by 2 publications

References 20 publications

Numerical Analysis of the Dynamic Interaction between Two Closely Spaced Vertical-Axis Wind Turbines

Numerical Analysis of the Dynamic Interaction between Two Closely Spaced Vertical-Axis Wind Turbines

Numerical Analysis of Dynamic Interaction Between Two Closely Spaced Vertical Axis Wind Turbines

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