IEA Wind TCP Task 29, Phase IV: Detailed Aerodynamics of Wind Turbines

Schepers, J.G.; Boorsma, K.; Madsen, H.A; Pirrung, Georg Raimund; Bangga, Galih; Guma, Giorgia; Lutz, Thorsten; Potentier, Thomas; Braud, Caroline; Guilmineau, Emmanuel; Croce, Alessandro; Cacciola, Stefano; Schaffarczyk, A. P.; Lobo, Brandon Arthur; Ivanell, Stefan; Asmuth, Henrik; Bertagnolio, Franck; Sørensen, Niels N.; Shen, Wenzhong; Grinderslev, Christian; Forsting, A. M.; Blondel, Frédéric; Bozonnet, Pauline; Boisard, Ronan; Yassin, Khaled; Hoening, L.; Stoevesandt, Bernhard; Imiela, Manfred; Greco, L.; Testa, Claudio; Magionesi, F.; Vijayakumar, Ganesh; Ananthan, Shreyas; Sprague, Michael; Branlard, Emmanuel; Jonkman, Jason; Carrion, Marina; Parkinson, Stephen T.; Cicirello, E.

doi:10.5281/zenodo.4817875

Cited by 3 publications

(4 citation statements)

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“…Yet, only the combination of inflow and load measurement allows for a clear assessment of actuator or BEM-based turbine models in waked inflow conditions. We can therefore highly recommend similar setups for future measurements campaigns even though expensive and challenging to calibrate [33]. Further valuable additions can be strain gauges on the tower, enabling reference estimations of the overall thrust force.…”

Section: Discussionmentioning

confidence: 99%

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Wind Turbine Response in Waked Inflow: A Modelling Benchmark Against Full-Scale Measurements

et al. 2021

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Section: Discussionmentioning

confidence: 99%

“…Nonetheless, it should be mentioned that selected cases of the DanAero experiment investigated within Task 29 showed inconsistencies when comparing measurements of the pressure forces and bending moments; see Ref. [33]. A small bias in the measured F n can thus not be fully ruled out.…”

Section: Power and Loads Of The Downstream Turbinementioning

confidence: 99%

Wind Turbine Response in Waked Inflow: A Modelling Benchmark Against Full-Scale Measurements

et al. 2021

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“…For the case of straight blades, previous studies have illustrated that the coupling factor is able to be automatically adjusted during the computation. Indeed, the dynamic response of the coupled model shows improved agreement with higher-fidelity models and experiments, when compared to the BEM method (Pirrung et al, 2017a;Schepers et al, 2021). However, the current method of coupling the near-and far-wake model is implicitly based on the assumption that the blade is straight and the rotor is planar.…”

Section: Far-wake Model and Coupling Methodsmentioning

confidence: 99%

A computationally efficient engineering aerodynamic model for swept wind turbine blades

Pirrung

Gaunaa

et al. 2022

Wind Energ. Sci.

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Abstract. In this work, a computationally efficient engineering model for the aerodynamics of swept wind turbine blades is proposed for the extended blade element momentum (BEM) formulation. The model is modified based on a coupled near- and far-wake model, in which the near wake is assumed to be the first quarter revolution of the non-expanding helical wake of the own blade. For the special case of in-plane trailed vorticity, the original empirical equations determining the steady-state value of the near-wake induction are replaced by the analytical results, which are in the form of incomplete elliptic integrals. For the general condition of helical trailed vorticities, the steady-state near-wake induction is approximated based on the results of the special conditions and a correction factor. The factor is calculated using empirical equations with influence coefficient tensors, to minimize the computational effort. These influence coefficient tensors are pre-calculated and are fitted to the results from the numerical integration of the Biot–Savart law. With the indicial function approach, it is not necessary to explicitly save the information of the vorticities that were trailed in the previous time steps. This engineering approach is a combination of analytical results and numerical approximations, with low and constant computational effort for each time step. The proposed model is practically applicable to time-marching aero-servo-elastic simulations. The results of the swept blades with uniform inflow perpendicular to the rotor calculated from the proposed model are compared with the results from a BEM code, a lifting-line solver and a Navier–Stokes solver. The significantly improved agreement with the higher-fidelity models compared to the BEM method highlights the performance of the proposed method.

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“…The code benefits from a long validation and verification history (e.g. [15,16,17,18]), and it can be used either in standalone mode for aerodynamic calculations on rigid turbines or coupled to an aeroelastic software for loadcase calculations. Two aerodynamic models are currently implemented in AM: a BEM method; and a higherfidelity FVW code known as AWSM [19].…”

Section: Tno Aeromodule: Awsm and Standard Bem Formulationmentioning

confidence: 99%

An engineering modification to the blade element momentum method for floating wind turbines

Mancini

Boorsma

Caboni

et al. 2022

J. Phys.: Conf. Ser.

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The design of next-generation offshore wind rotors for floating applications carries large uncertainties that make it harder to bring costs down. A significant share of this uncertainty is associated with the use of Blade Element Momentum (BEM) methods to run aeroelastic design and loadcase calculations, because the assumptions underlying the momentum theory are violated by the floater motion. This work presents an engineering method for BEM that allows to model generic floater motions and improves the aerodynamic modelling of floating wind turbines. The new model overcomes the challenge of estimating the apparent wind caused by the platform motion in a simple way, which proves to be very effective for rigid aerodynamic simulations. To verify its impact, BEM results with and without the proposed correction are compared to high-fidelity free vortex wake simulations, imposing the same harmonic motion first to the pitch and then to the yaw degree of freedom of the platform. While little differences are found for the yaw motion, the new floating model clearly improves predictions for the platform pitch case in terms of both aerodynamic loads and induction, finding a very good match with the high-fidelity results. An analysis of the verification data provides new valuable insights on the effect of these motions on aerodynamic loads and performance of a floating wind turbine.

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IEA Wind TCP Task 29, Phase IV: Detailed Aerodynamics of Wind Turbines

Cited by 3 publications

References 0 publications

Wind Turbine Response in Waked Inflow: A Modelling Benchmark Against Full-Scale Measurements

Wind Turbine Response in Waked Inflow: A Modelling Benchmark Against Full-Scale Measurements

A computationally efficient engineering aerodynamic model for swept wind turbine blades

An engineering modification to the blade element momentum method for floating wind turbines

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