A study on the aerodynamics of a floating wind turbine rotor

Farrugia, Russell; Sant, Tonio; Micallef, Daniel

doi:10.1016/j.renene.2015.08.063

Cited by 81 publications

(59 citation statements)

References 6 publications

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“…Other frequencies, in particular if not harmonics of the rotor rotational frequency, could lead to much more complex wake dynamics. Compared to numerical wake analyses by Tran and Kim [9] under 6 degrees of freedom of the platform motion, or Farrugia et al [5] under surge only motion, the wake here is much more unstable, with vortex merging beginning already 1.5 rotor radii downstream of the turbine. This difference can be explained by the highly unsteady conditions of the chosen wave motion due to the low wake reduced velocity.…”

Section: Near-wake Analysismentioning

confidence: 52%

“…Several studies have been dedicated to the study of offshore wind turbines under only surge motion ( [2], [3], [4], [5]), only pitch motion ( [6], [7]), or a combination of different platform motions ( [8], [9]). Bayati et al [8] evaluated the unsteady aerodynamics of floating offshore wind turbines as function of the amplitude and frequency of mono-harmonic surge and pitch motions.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the numerical analyses are based on simplified approaches, like wake dynamic models, BEM theory or Generalized Dynamic Wake model (GDW), and take as reference simulations with the actuator disc model. Only Farrugia et al [5] used a lifting line method in a free-wake vortex code to perform a detailed analysis of the rotor and wake unsteadiness under surge motion, and Tran and Kim [9] performed high-fidelity Computational Fluid Dynamics (CFD) simulations. In the same way, the current investigation aims at performing high-fidelity simulations of a floating wind turbine under monoharmonic surge motion, allowing a more detailed insight into the wake flow physics.…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Cormier

Caboni

Lutz

et al. 2018

J. Phys.: Conf. Ser.

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Section: Near-wake Analysismentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Cormier

Caboni

Lutz

et al. 2018

J. Phys.: Conf. Ser.

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“…The steady operation data of the reference wind turbine was used to show accuracy of the BEM code and the pitch control system. Moreover, additional steady‐state results of the same wind turbine consisting of experimental data, VLM method results, and GH‐BLADED software data were utilized in validation of the present BEM code. The results of steady‐running simulation are shown in Figure .…”

Section: Implementation and Validationmentioning

confidence: 99%

Effect of platform disturbance on the performance of offshore wind turbine under pitch control

Aliabadi

Rasekh

2020

Wind Energy

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The aerodynamic performance of offshore floating wind turbines (OFWTs) is more complicated than onshore wind turbines due to 6-degree of freedom (DOF) motion of the floating platform. In the current study, the aerodynamic analysis of a horizontal-axis floating offshore wind turbine is performed with the aim of studying the effects of floating platform movement on the aerodynamic characteristics of the turbine in the presence of a pitch angle control system. The National Renewable Energy Laboratory (NREL) 5-MW offshore wind turbine is selected as the baseline wind turbine. For this sake, the unsteady blade element momentum method with dynamic stall and dynamic inflow models have been employed to obtain the unsteady aerodynamic loads. The baseline pitch angle control system is assumed to be coupled with the aerodynamic model to maintain the rated condition of the wind turbine and also to approach a closer model of wind turbine. In case of pitching motion input, the reduction of mean power coefficient for tip speed ratios (TSRs) less that 7 is expected by an amount of 16% to 20% at pitch amplitude of 2 and frequency of 0.1 Hz. For high TSRs, the trend is reverse with respect to fixed-platform case. The mean thrust coefficient is reduced for almost all range of TSRs with maximum loss of 37%.Moreover, the mean control pitch angle that is an index of control system effort is increased. The results also represent the importance of considering the pitch control system for aerodynamic analysis of disturbed OFWT. K E Y W O R D Sfloating offshore wind turbine, pitch, pitch control system, platform disturbance, unsteady blade element momentum method 1 | INTRODUCTION Nowadays, the numerous advantages of offshore wind turbines (OWTs) lead us to use them in order to harvest energy from offshore wind.Although the construction and installation of OWTs are more expensive than the onshore wind farms, the availability of space and fewer complaints about noise problems make them more attractive compared with the onshore wind turbines. 1 Moreover, the wind energy potential is considerable at offshore. Statistics 2,3 show that the rated capacity of OWTs has grown 62% over the past decade, particularly the mean rated capacity of OWTs has increased about 15.4% from 2015 to 2016.The foundation type of the OWT depends on the sea depth, which could be either fixed or floated. In deep-sea area, the floating platform is utilized instead of fixed-foundation technology. Due to the waves and currents in sea regions, offshore floating wind turbines (OFWTs)

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“…Currently, there is a great interest in studying wind turbines to improve its aerodynamic performance (Farrugia et al, 2016;Subramanian et al, 2016;Sedaghat et al, 2014;Jeon et al, 2014;Li et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic analysis of backward swept in HAWT rotor blades using CFD

Salari

Boushehri

Boroushaki

2018

Int. J. Renew. Energy Dev.

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The aerodynamical design of backward swept for a horizontal axis wind turbine blade has been carried out to produce more power at higher wind velocities. The backward sweep is added by tilting the blade toward the air flow direction. Computational Fluid Dynamics (CFD) calculations were used for solving the conservation equations in one outer stationary reference frame and one inner rotating reference frame, where the blades and grids were fixed in reference to the rotating frame. The blade structure was validated using Reynolds Averaged Navier-Stokes (RANS) solver in a test case by the National Renewable Energy Laboratory (NREL) VI blades results. Simulation results show considerable agreement with the NREL measurements. Standard K-ε turbulence model was chosen for simulations and for the backward swept design process. A sample backward sweep design was applied to the blades of a Horizontal Axis Wind Turbine (HAWT) rotor, and it is obtained that although at the lower wind velocities the output power and the axial thrust of the rotor decrease, at the higher wind velocities the output power increases while the axial thrust decreases. The swept blades have shown about 30 percent increase in output power and about 12 percent decrease in thrust at the wind speed of 14 m/s.

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A study on the aerodynamics of a floating wind turbine rotor

Cited by 81 publications

References 6 publications

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Effect of platform disturbance on the performance of offshore wind turbine under pitch control

Aerodynamic analysis of backward swept in HAWT rotor blades using CFD

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