Force Measurements on a VAWT Blade in Parked Conditions

Goude, Anders; Rossander, Morgan

doi:10.3390/en10121954

Cited by 13 publications

(10 citation statements)

References 16 publications

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“…The chord length varies linearly from 32 cm at the root up to 20 cm at the attachment point. A detailed description of the strut geometry can be referred to Goude and Rossander 25 . The tower is modeled in the simulation as a circular cylinder with the radius of 0.10 m.…”

Section: Turbine Geometrymentioning

confidence: 99%

A numerical study of strut and tower influence on the performance of vertical axis wind turbines using computational fluid dynamics simulation

et al. 2022

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This paper presents the influence of the strut and the tower on the aerodynamic force of the blade for the vertical axis wind turbine (VAWT). It has been known that struts degrade the performance of VAWTs due to the inherent drag losses. In this study, three-dimensional Reynolds-averaged Navier-Stokes simulations have been conducted to investigate the effect of the strut and the tower on the flow pattern around the rotor region, the blade force distribution, and the rotor performance.A comparison has been made for three different cases where only the blade; both the blade and the strut; and all of the blade, the strut, and the tower are considered.A 12-kW three-bladed H-rotor VAWT has been studied for tip speed ratio of 4.16. This ratio is relatively high for this turbine, so the influence of the strut is expected to be crucial. The numerical model has been validated first for a single pitching blade and full VAWTs. The simulations show distinguished differences in the force distribution along the blade between two cases with and without struts. Since the wake from the struts interacts with the blades, the tangential force is reduced especially in the downwind side when the struts are considered. The calculated power coefficient is decreased by 43 %, which shows the importance of modeling the strut effect properly for accurate prediction of the turbine performance. The simulations also indicate that including the tower does not yield significant difference in the force distribution and the rotor power.

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Section: Turbine Geometrymentioning

confidence: 99%

A numerical study of strut and tower influence on the performance of vertical axis wind turbines using computational fluid dynamics simulation

et al. 2022

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“…Ottermo et al (2012) used analytical expressions to estimate storm/extreme loads at parked conditions to find an optimal parking strategy. Experimental measurements of parked loads on blades were conducted on a 12 kW VAWT by Goude et al (Goude and Rossander (2017)). Finally some computational fluid dynamics (CFD) on operating loads and parked loads were done by Paulsen et al (2013) for the DeepWind concept.…”

Section: Parked Loadsmentioning

confidence: 99%

Parked and Operating Loads Analysis in the Aerodynamic Design of Multi-megawatt-scale Floating Vertical Axis Wind Turbines

Sakib

Griffith

2021

Preprint

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Abstract. A good understanding of aerodynamic loading is essential in the design of vertical axis wind turbines (VAWTs) to properly capture design loads and to estimate the power production. This paper presents a comprehensive aerodynamic design study for a 5 MW Darrieus offshore VAWT in the context of multi-megawatt floating VAWTs. This study systematically analyzes the effect of different, important design variables including the number of blades (N), aspect ratio (AR) and blade tapering in a comprehensive loads analysis of both the parked and operating aerodynamic loads including turbine power performance analysis. Number of blades (N) is studied for 2- and 3-bladed turbines, aspect ratio is defined as ratio of rotor height (H) and rotor diameter (D) and studied for values from 0.5 to 1.5, and blade tapering is applied by means of adding solidity to the blades towards blade root ends, which affects aerodynamic and structural performance. Analyses were carried out using a three-dimensional vortex model named CACTUS (Code for Axial and Crossflow TUrbine Simulation) to evaluate both instantaneous azimuthal parameters as well as integral parameters, such as loads (thrust force, lateral force, and torque loading) and power. Parked loading is a major concern for VAWTs, thus this work presents a broad evaluation of parked loads for the design variables noted above. This study also illustrates that during the operation of a turbine, lateral loads are on par with thrust loads, which will significantly affect the structural sizing of rotor and platform & mooring components.

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“…A detailed description of the strut geometry can be referred to Goude and Rossander. 31 The turbine rotates with an angular velocity ω, and the azimuth angle is denoted by θ. The value of θ is 0 when the blades move toward the freestream wind (see Figure 3).…”

Section: Turbine Geometrymentioning

confidence: 99%

Aeroacoustic noise prediction of a vertical axis wind turbine using large eddy simulation

Aihara

Bolin

Goude

et al. 2021

International Journal of Aeroacoustics

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This study investigates the numerical prediction for the aerodynamic noise of the vertical axis wind turbine using large eddy simulation and the acoustic analogy. Low noise designs are required especially in residential areas, and sound level generated by the wind turbine is therefore important to estimate. In this paper, the incompressible flow field around the 12 kW straight-bladed vertical axis wind turbine with the rotor diameter of 6.5 m is solved, and the sound propagation is calculated based on the Ffowcs Williams and Hawkings acoustic analogy. The sound pressure for the turbine operating at high tip speed ratio is predicted, and it is validated by comparing with measurement. The measured spectra of the sound pressure observed at several azimuth angles show the broadband characteristics, and the prediction is able to reproduce the shape of these spectra. While previous works studying small-scaled vertical axis wind turbines found that the thickness noise is the dominant sound source, the loading noise can be considered to be a main contribution to the total sound for this turbine. The simulation also indicates that the received noise level is higher when the blade moves in the downwind than in the upwind side.

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Force Measurements on a VAWT Blade in Parked Conditions

Cited by 13 publications

References 16 publications

A numerical study of strut and tower influence on the performance of vertical axis wind turbines using computational fluid dynamics simulation

A numerical study of strut and tower influence on the performance of vertical axis wind turbines using computational fluid dynamics simulation

Parked and Operating Loads Analysis in the Aerodynamic Design of Multi-megawatt-scale Floating Vertical Axis Wind Turbines

Aeroacoustic noise prediction of a vertical axis wind turbine using large eddy simulation

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