Abstract
To account for the problem of an azimuthally constant induction in the BEM method, which influences on incorrectly predicted aerodynamic loads in the yawed flow, a skewed-wake model implementation to the BEM method has been performed. The numerical aerodynamic loads have been compared with the wind tunnel data of the NREL Phase VI and against another numerical campaign. At first, the model predictions have been validated against experimental data performed with aligned flow conditions, showing a reasonable match. Successively, the model predictions are validated against experimental results obtained with the wind turbine yawed. Results show, a possible better prediction of loads at yawed flow with Skewed-Wake correction, however the method does not overall correlate better, compared to the BEM method with implemented local variability of the induction factor.
Highlights
The turbines in a wind farm are often experiencing yawed operating conditions or highly sheared inflows, which could lead to a consistent reduction of the power production and to an increase of the fatigue loads [1]
To account for the problem of an azimuthally constant induction in the Blade Element Momentum (BEM) method, which influences on incorrectly predicted aerodynamic loads in the yawed flow, a skewed-wake model implementation to the BEM method has been performed
These operating conditions will become more common in the future, since it has been found that yawing a wind turbine away from the wind is an effective way of altering the path of the wake and boosting the overall wind farm power [2, 3, 4, 5, 6]
Summary
The turbines in a wind farm are often experiencing yawed operating conditions or highly sheared inflows, which could lead to a consistent reduction of the power production and to an increase of the fatigue loads [1]. To evaluate the performance/loads of a yawed wind turbine, the most widely used approach is coupling the Blade Element Momentum (BEM) method to an aeroelastic solver. Such a solution is preferred to more advanced approach, like computational fluid-structure interaction and flow simulation, thanks to its low computational cost and its relatively good accuracy. The BEM Skewed-Wake model developed in [7] has been implemented within the multibody aero-elastic solver CpLambda [8], and the numerical results are compared with the data from a well-known experimental campaign
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