Computational methods for the performance prediction of HAWTs

Gould, John; Fiddes, SP

doi:10.1016/0167-6105(92)90533-g

Cited by 15 publications

(5 citation statements)

References 9 publications

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“…However, the prescription of the wake structure leaves open some questions about how the wake will expand, the local pitch angle and what will be the consequences on its dynamics, while there is little doubt that the flow at the rotor will be correctly estimated. If the wake is expanding but its shape is still prescribed, no analytical solution is yet been found, and numerical models have been developed by using lifting-line methods 10 or vortex-lattice methods to predict the wake 11,12 often combined with panel methods to replicate the blade presence. The method of acceleration potential, where the rotor is treated as a weak perturbation to the incoming flow, allows the determination of simple asymptotic relationships and is a valid alternative to these vortex methods (VMs).…”

Section: Introductionmentioning

confidence: 99%

Comparison of the near‐wake between actuator‐line simulations and a simplified vortex model of a horizontal‐axis wind turbine

et al. 2015

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The flow around an isolated horizontal-axis wind turbine is estimated by means of a new vortex code based on the Biot-Savart law with constant circulation along the blades. The results have been compared with numerical simulations where the wind turbine blades are replaced with actuator lines. Two different wind turbines have been simulated: one with constant circulation along the blades, to replicate the vortex method approximations, and the other with a realistic circulation distribution, to compare the outcomes of the vortex model with real operative wind-turbine conditions (Tjaereborg wind turbine). The vortex model matched the numerical simulation of the turbine with constant blade circulation in terms of the near-wake structure and local forces along the blade. The results from the Tjaereborg turbine case showed some discrepancies between the two approaches, but overall, the agreement is qualitatively good, validating the analytical method for more general conditions. The present results show that a simple vortex code is able to provide an estimation of the flow around the wind turbine similar to the actuator-line approach but with a negligible computational effort.

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Section: Introductionmentioning

confidence: 99%

Comparison of the near‐wake between actuator‐line simulations and a simplified vortex model of a horizontal‐axis wind turbine

et al. 2015

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“…Duquette and Visser [11] examined blade number and the solidity effect on the performance of HAWT with different theories such as BEMT, rigid wake mothod (RWM) according to Kotb [12] and expanding wake model (EWM) based on Gould and fiddes [13].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Solidity Ratio in a Horizontal Wind Turbine

Tekşin¹,

Kurt²

2021

enenstrg

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A wind turbine-generator system; Parameters such as wind speed, turbine blade diameter, number of blades, turbine height, tip speed ratio and solidity ratio are affected. In this study, horizontal axis wind turbine with diameter of 130 cm and blade solidity ratio values of 7%, 8,6% and 9,8% were constructed and the tests were made according to different blade speed ratios. The required blades were obtained from PVC pipes of different diameters. The experimental study was actualized in Erciyes University Mechanical Engineering, Engines Laboratory. For each profile, blade rotational speeds and wind speeds at various distances have been studied. It has been determined that the wind speed is reduced by the distance difference and accordingly the number of blade speed is decreased visibly. In the wing profiles with different blade solidity ratios resulting from the work done, the wing structure with the solidity ratio of 8.6% gave the best performance. CL and CD coefficients of the profiled specimens were analyzed by FLUENTTM, a program of computational fluid dynamics. One of the factors that should be taken into consideration in the production of wind turbines is the blade solidity ratio.

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“…Prescribed wake modelling has for many years been seen as an alternative to more intensive free wake methods in providing aerodynamic performance estimates for helicopter rotors. This approach has also been applied to both HAWTs and VAWTs using both lifting line and lifting surface formulations [8][9][10][11]. The prescribed wake model can yield results of comparable accuracy to a free wake model if the wake is correctly prescribed, while requiring only a fraction of the computational power.…”

Section: Introductionmentioning

confidence: 99%

The prediction of horizontal axis wind turbine performance in yawed flow using an unsteady prescribed wake model

Coton

Wang

1999

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper describes a fast, accurate, fully unsteady aerodynamic prediction scheme for the calculation of horizontal axis wind turbine performance in yawed flow. The method couples a prescribed wake vortex model with a semi-empirical unsteady aerofoil model to provide the unsteady aerodynamic response of the blades owing to the cyclic variation of incidence. Predictions from the model are shown to compare well with experiment, both in terms of gross performance prediction and detailed blade loads. Finally, the potential for future improvements to the predictive capability of the model is discussed.

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Computational methods for the performance prediction of HAWTs

Cited by 15 publications

References 9 publications

Comparison of the near‐wake between actuator‐line simulations and a simplified vortex model of a horizontal‐axis wind turbine

Comparison of the near‐wake between actuator‐line simulations and a simplified vortex model of a horizontal‐axis wind turbine

Investigation of the Solidity Ratio in a Horizontal Wind Turbine

The prediction of horizontal axis wind turbine performance in yawed flow using an unsteady prescribed wake model

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