Influence of lateral rotor spacing on the benefits in power generated by multi-rotor configurations

Martín-San-Román, Raquel; Benito-Cia, Pablo; Azcona, José; Cuerva-Tejero, Alvaro

doi:10.1088/1742-6596/2362/1/012024

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…Aerodynamic interaction between rotors may be included within BEM aerodynamics by first using CFD‐based models to quantify the steady‐state velocity field around the rotors for different system states, and by later including the resulting wind velocity deficit in the undisturbed velocity field used for analysis. Furthermore, recent work from Martín‐San‐Román et al studied the aerodynamic influence of a two‐rotor system by means of an experimental aerodynamic module based on the free wake vortex method (FVM) 41 . Results indicated that the variation of the mean thrust coefficient compared with a single‐rotor configuration is small (about 2%).…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, recent work from Martín-San-Román et al studied the aerodynamic influence of a tworotor system by means of an experimental aerodynamic module based on the free wake vortex method (FVM). 41 Results indicated that the variation of the mean thrust coefficient compared with a single-rotor configuration is small (about 2%). Moreover, previous work in different fields concerning similar applications, such as the study of thrust imbalance due to aerodynamic interactions in unmanned aerial vehicles (UAVs), also suggests that the effect of aerodynamic interactions on the aerodynamic loads acting on the system may not be significant enough to compromise the results obtained with the method employed in this work.…”

Section: Multi-rotor Wind Turbine System (2wt)mentioning

confidence: 96%

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Load response of a two‐rotor floating wind turbine undergoing blade‐pitch system faults

2023

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Multi‐rotor floating wind turbines are among the innovative technologies proposed in the last decade in the effort to reduce the cost of wind energy. These systems are able to offer advantages in terms of smaller blades deployed offshore, cheaper operations, fewer installations, and sharing of the floating platform. As the blade‐pitch actuation system is prone to failures, the assessment of the associated load scenarios is commonly required. Load assessment of blade‐pitch fault scenarios has only been performed for single‐rotor solutions. In this work, we address the effect of blade‐pitch system faults and emergency shutdown on the dynamics and loads of a two‐rotor floating wind turbine. The concept considered employs two NREL 5‐MW baseline wind turbines and the OO‐Star semi‐submersible platform. The blade‐pitch faults investigated are blade blockage and runaway, that is, the seizure at a given pitch angle and the uncontrolled actuation of one of the blades, respectively. Blade‐pitch faults lead to a significant increase in the structural loads of the system, especially for runaway fault conditions. Emergency shutdown significantly excites the platform pitch motion, the tower‐bottom bending moment, and tower torsional loads, while suppressing the faulty blade flapwise bending moment after a short peak. Shutdown delay between rotors increases significantly the maxima of the torsional loads acting on the tower. Comparison of blade loads with data from single‐rotor spar‐type study show great similarity, highlighting that the faulty blade loads are not affected by (1) the type of platform used and (2) the multi‐rotor deployment.

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Section: Methodsmentioning

confidence: 99%

Section: Multi-rotor Wind Turbine System (2wt)mentioning

confidence: 96%

Load response of a two‐rotor floating wind turbine undergoing blade‐pitch system faults

2023

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“…Their computational study showed an increase of both power output and thrust force of a multirotor with seven rotors (MR7) compared to a single rotor, and identified local regions of increased flow velocities in the wake between the rotors. The influence of lateral rotor spacing on power and thrust was investigated by Martín San Román et al [4]. Using free-wake vortex methods, they showed increasing power and thrust coefficients when the spacing between the rotors was decreased.…”

Section: Introductionmentioning

confidence: 99%

Experiments on the wake flow behind different configurations of multirotor wind turbines

Jørs,

Mjåtveit,

Skoland

et al. 2023

J. Phys.: Conf. Ser.

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Multirotor wind turbine concepts have recently emerged as a promising alternative to conventional turbines. When arranged in farms, the wake flow behind multirotor assemblies becomes an important factor in the cost-of-energy equation. This paper presents a lab-scale experiment on the effect of rotor number, inter-rotor spacing and yaw-misalignment on the wake development behind a simplified multirotor model. The flow characteristics are investigated by towing different arrangements of porous discs in a large water tank while traversing an Acoustic Doppler Velocimeter in the wake. Results show lower initial velocity deficits in a multirotor’s near wake, whereas its far wake is observed to be similar to the one of a single rotor. The wake’s recovery rate is first stimulated by additional shear stresses in between the single rotors, while flattening off further downstream. Measurements on the wake flow behind individual yaw on the single rotors compared to collective yaw on all rotors show a similar deflection of the mean velocity deficit in the wake.

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Numerical Framework for the Coupled Analysis of Floating Offshore Multi-Wind Turbines

Berdugo-Parada,

Servan-Camas,

Garcia-Espinosa

2023

JMSE

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Floating offshore multi-wind turbines (FOMWTs) are an interesting alternative to the up-scaling of wind turbines. Since this is a novel concept, there are few numerical tools for its coupled dynamic assessment at the present time. In this work, a numerical framework is implemented for the simulation of multi-rotor systems under environmental excitations. It is capable of analyzing a platform using leaning towers that handle wind turbines with their own features and control systems. This tool is obtained by coupling the seakeeping hydrodynamics solver SeaFEM with the single wind turbine simulation tool OpenFAST. The coupling of SeaFEM provides a higher fidelity hydrodynamic solution, allowing the simulation of any structural design using the finite element method (FEM). Additionally, a methodology is proposed for the extension of the single wind solver, allowing for the analysis of multi-rotor configurations. To do so, the solutions of the wind turbines are computed independently using several OpenFAST instances, performing its dynamic interaction through the floater. This method is applied to the single turbine Hywind concept and the twin-turbine W2Power floating platform, supporting NREL 5-MW wind turbines. The rigid-body response amplitude operators (RAOs) are computed and compared with other numerical tools. The results showed consistency in the developed framework. An agreement was also obtained in simulations with aerodynamic loads. This resulting tool is a complete time-domain aero–hydro–servo–elastic solver that is able to compute the combined response and power generation performance of multi-rotor systems.

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Influence of lateral rotor spacing on the benefits in power generated by multi-rotor configurations

Cited by 3 publications

References 26 publications

Load response of a two‐rotor floating wind turbine undergoing blade‐pitch system faults

Load response of a two‐rotor floating wind turbine undergoing blade‐pitch system faults

Experiments on the wake flow behind different configurations of multirotor wind turbines

Numerical Framework for the Coupled Analysis of Floating Offshore Multi-Wind Turbines

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