An upper size of vertical axis wind turbines

Ottermo, Fredric; Bernhoff, Hans

doi:10.1002/we.1655

Cited by 21 publications

(10 citation statements)

References 11 publications

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“…VAWTs typically have fewer moving parts and a generator located at ground level, which could ultimately lead to lower maintenance cost and higher availability . Also, in Ottermo and Bernhoff it has been shown that the concept is more suitable for upscaling than the HAWT concept. Furthermore, the VAWT concept has potentially lower noise emission …”

Section: Introductionmentioning

confidence: 99%

Turbulence influence on wind energy extraction for a medium size vertical axis wind turbine

et al. 2016

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The relation between power performance and turbulence intensity for a VAWT H-rotor is studied using logged data from a 14 month (discontinuous) period with the H-rotor operating in wind speeds up to 9 m/s. The turbine, designed originally for a nominal power of 200 kW, operated during this period mostly in a restricted mode due to mechanical concerns, reaching power levels up to about 80 kW. Two different approaches are used for presenting results, one that can be compared to power curves consistent with the International Electrotechnical Commission (IEC) standard and one that allows isolating the effect of turbulence from the cubic variation of power with wind speed. Accounting for this effect, the turbine still shows slightly higher efficiency at higher turbulence, proposing that the H-rotor is well suited for wind sites with turbulent winds. The operational data are also used to create a C p (λ) curve, showing slightly lower C p compared with a curve simulated by a double multiple streamtube model.

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Section: Introductionmentioning

confidence: 99%

Turbulence influence on wind energy extraction for a medium size vertical axis wind turbine

et al. 2016

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“…VAWTs typically have fewer moving parts and a generator located at ground level which could ultimately lead to higher availability and lower maintenance cost [1]. Furthermore, it has been shown that the concept is more suitable for up-scaling than the HAWT concept [2]. Moreover, of special interest here, VAWTs has potentially lower noise emission [1].…”

Section: Introductionmentioning

confidence: 99%

Noise Emission of a 200 kW Vertical Axis Wind Turbine

et al. 2015

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Abstract:The noise emission from a vertical axis wind turbine (VAWT) has been investigated. A noise measurement campaign on a 200 kW straight-bladed VAWT has been conducted, and the result has been compared to a semi-empirical model for turbulent-boundary-layer trailing edge (TBL-TE) noise. The noise emission from the wind turbine was measured, at wind speed 8 m/s, 10 m above ground, to 96.2 dBA. At this wind speed, the turbine was stalling as it was run at a tip speed lower than optimal due to constructional constraints. The noise emission at a wind speed of 6 m/s, 10 m above ground was measured while operating at optimum tip speed and was found to be 94.1 dBA. A comparison with similar size horizontal axis wind turbines (HAWTs) indicates a noise emission at the absolute bottom of the range. Furthermore, it is clear from the analysis that the turbulent-boundary-layer trailing-edge noise, as modeled here, is much lower than the measured levels, which suggests that other mechanisms are likely to be important, such as inflow turbulence.

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“…It is a technology that has received an increased interest recently, especially for offshore applications due to its low center of gravity [1][2][3]. The technology has the potential to scale to large sizes as shown by Ottermo and Bernhoff [4]. A comparison between a horizontal axis wind turbine (HAWT) and a VAWT by Eriksson et al concluded that the VAWT can be built with less moving parts and that the straight-bladed Darrieus design has manufacturing benefits compared to the curved Darrieus turbine [5].…”

Section: Introductionmentioning

confidence: 99%

Force Measurements on a VAWT Blade in Parked Conditions

Goude

Rossander

2017

Energies

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Abstract:The forces on a turbine at extreme wind conditions when the turbine is parked is one of the most important design cases for the survivability of a turbine. In this work, the forces on a blade and its support arms have been measured on a 12 kW straight-bladed vertical axis wind turbine at an open site. Two cases are tested: one during electrical braking of the turbine, which allows it to rotate slowly, and one with the turbine mechanically fixed with the leading edge of the blade facing the main wind direction. The force variations with respect to wind direction are investigated, and it is seen that significant variations in forces depend on the wind direction. The measurements show that for the fixed case, when subjected to the same wind speed, the forces are lower when the blade faces the wind direction. The results also show that due to the lower forces at this particular wind direction, the average forces for the fixed blade are notably lower. Hence, it is possible to reduce the forces on a turbine blade, simply by taking the dominating wind direction into account when the turbine is parked. The measurements also show that a positive torque is generated from the blade for most wind directions, which causes the turbine to rotate in the electrically-braked case. These rotations will cause increased fatigue loads on the turbine blade.

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An upper size of vertical axis wind turbines

Cited by 21 publications

References 11 publications

Turbulence influence on wind energy extraction for a medium size vertical axis wind turbine

Turbulence influence on wind energy extraction for a medium size vertical axis wind turbine

Noise Emission of a 200 kW Vertical Axis Wind Turbine

Force Measurements on a VAWT Blade in Parked Conditions

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