Rotor‐integrated modeling of wind turbine aerodynamics

Abstract

A novel approach for the modeling of rotor‐integrated aerodynamic loads is suggested to answer the need for a comprehensive, insightful, and analytical actuator disc model. All the six degrees of freedom (including tangential components) are considered. It is shown that loads may be written as a quadratic form of a reduced six‐component velocity vector at the hub. The individual contributions of lift and drag, azimuthal variations, as well as blade pitching and tip losses are isolated. Errors introduced by the necessary approximations are discussed, and parametric corrections are considered. Parameter identification methods are then suggested, and the performance of the resulting calibrated analytical models is assessed. Results show that the new modeling approach is able to accurately model both the mean values of the thrust and power coefficients and their derivatives with respect to tip‐speed ratio and pitch angle across the full range of operating wind speeds. Furthermore, it is able to reconstruct the general rotor behavior with a minimal amount of information available. Tangential components are also well modeled, although they require the knowledge of airfoil properties. The model's architecture leaves room for extensions to dynamic flow, skewed flow, and azimuthal load variations.

Synthetic turbulence modelling for offshore wind farm engineering models using coherence aggregation

“…where indexing of Γ refers to matrix elements and not iterations. Follows a reconstruction of Γuu using (17) or (23). Although overlooked by Grigoriadis et al in their paper, it can be shown that P TBT does not need to be attributed a Dykstra correction 27 -like P U , but unlike P PD -, as it is linear (the projection of a sum equals the sum of projections of its elements).…”

“…They are however more important at the turbines, where augmenting the rotor-based load-equivalent wind speed vector with shears is valuable to capture blade loads by rotational sampling of non-uniform wind field as well as tangential rotor loads (particularly yaw and pitch moments), especially on floating offshore wind turbines 22 . It may readily be included in actuator-disc (hub-height) wind input models in OpenFAST 5 and used in advanced actuator disc models 23 .…”

Study on a performance matching method of wind rotor and generator based on energy transfer

“…Gordievsky presented MATLAB Simulink model of Vertical Axis Wind Turbine to demonstrate the functional components and simulation modes [17]. Chabaud proposed a novel approach for the modeling of rotor-integrated aerodynamic loads considering all the six degrees of freedom (including tangential components), and parameter identification methods were suggested also [18]. Elkington et al proposed a 3rd-order doubly-fed induction generator electromotive force model, which with was similar to the commonly used 5rd-order wind turbine model [19].…”