Contributions of the Stochastic Shape Wake Model to Predictions of Aerodynamic Loads and Power under Single Wake Conditions

The Science of Making Torque from Wind

Doubrawa, P.^1 ; Barthelmie, R.J.^1 ; Wang, H.^1 ; Churchfield, M.J.^2

Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca

NY, United States^1

National Renewable Energy Laboratory, Golden

CO, United States^2

关键词: Aero-elastic simulations;    Axisymmetric;    Blade roots;    Damage equivalent loads;    Inflow conditions;    Power fluctuations;    Shape model;    Wake meandering;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/8/082006/pdf
DOI  :  10.1088/1742-6596/753/8/082006

来源: IOP

【 摘 要 】

The contribution of wake meandering and shape asymmetry to load and power estimates is quantified by comparing aeroelastic simulations initialized with different inflow conditions: an axisymmetric base wake, an unsteady stochastic shape wake, and a large-eddy simulation with rotating actuator-line turbine representation. Time series of blade-root and tower base bending moments are analyzed. We find that meandering has a large contribution to the fluctuation of the loads. Moreover, considering the wake edge intermittence via the stochastic shape model improves the simulation of load and power fluctuations and of the fatigue damage equivalent loads. These results indicate that the stochastic shape wake simulator is a valuable addition to simplified wake models when seeking to obtain higher-fidelity computationally inexpensive predictions of loads and power.