Numerical Simulation on Tandem Layout of Two Vertical Axis Wind Turbines

Hara, Yutaka; Jodai, Yoshifumi; Yamamoto, Shu; Okinaga, Tomoyuki

doi:10.1299/jsmemecj.2019.j05325

Cited by 5 publications

(7 citation statements)

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“…In a previous report [22] on the wake of the tandem layouts where the calculation time was shorter, little difference was observed between the TCO and TIR. However, we observed a significant difference in the wake between the TCO and TIR in our study (see Figure 12b).…”

Section: Gap Dependence Of Tandem Layoutsmentioning

confidence: 88%

“…However, in the neighborhood of θ = 180°, the angular velocities of both rotors were similar to that of an isolated single rotor, or the angular velocity of one rotor was higher than and that of the other rotor was lower than the angular velocity of an isolated single rotor. In a previous report [22] on the wake of the tandem layouts where the calculation time was shorter, little difference was observed between the TCO and TIR. However, we observed a significant difference in the wake between the TCO and TIR in our study (see Figure 12b).…”

Section: Gap and Wind-direction Dependence Of 16-direction Layoutsmentioning

confidence: 88%

“…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%

See 2 more Smart Citations

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

Yamamoto

Hara

Jodai

2019

The Proceedings of Conference of Chugoku-Shikoku Branch

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Section: Gap Dependence Of Tandem Layoutsmentioning

confidence: 88%

Section: Gap and Wind-direction Dependence Of 16-direction Layoutsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Yamamoto

Hara

Jodai

2019

The Proceedings of Conference of Chugoku-Shikoku Branch

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Section: Introductionmentioning

confidence: 99%

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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“…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 Simulation on Tandem Layout of Two Vertical Axis Wind Turbines

Cited by 5 publications

References 0 publications

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

Numerical analysis on 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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