Abstract
In order to study the influence of wind shear on the aerodynamic characteristics of large wind turbines, taking the 5MW wind turbine blade model published by NREL as the research object, large eddy simulation (LES) of wind turbines was carried out by using XFlow fluid simulation software based on Lattice-Boltzmann method (LBM). WALE turbulence model was used to study wind shear at 3, 11.2 and 25m/s wind speeds. The effect of factors on the axial thrust and torque of wind turbines is compared with the data published by NREL. The results show that the XFlow software based on LBM and LES method has good capturing ability for the eddy wake of wind turbine; wind shear causes the airfoil section of each section of blade to deviate from the best designed attack angle in theory and results in a decrease in torque applied to the wind turbine.
Highlights
Under the trend of large-scale development of wind turbines, it becomes important to accurately analyze the aerodynamic performance of large wind turbines
According to the aerodynamic loads of wind turbines obtained from the analysis, the aerodynamic layout optimization design of wind turbines is carried out, simulation (LES) of wind turbine was carried out by XFlow fluid simulation software, and studies the influence of wind shear factor on axial thrust and torque of wind turbine at 3, 11.2 and 25 m/s wind speeds, and verifies the reliability of simulation software by comparing it with published data of National Renewable Energy Laboratory (NREL)
The results show that the relative errors between the numerical simulation results and NREL open results of the axial force and the torque of the wind turbine are within a reasonable range, which shows that the XFlow software based on Lattice-Boltzmann method and large eddy simulation has high accuracy for the simulation of wind turbine vortex wake
Summary
Under the trend of large-scale development of wind turbines, it becomes important to accurately analyze the aerodynamic performance of large wind turbines. Which ensures the structural strength and at the same time obtains a higher wind energy utilization coefficient [1].At 2 Geometric models and present, experimental and numerical simulation methods computational domains are mainly used to study the aerodynamic performance of wind turbines. The numerical simulation methods mainly include Blade-element Theory (BEM), eddy current. 2.1 Three-dimensional model of wind turbine theory and computational fluid dynamics method (CFD) [2]. With the improvement of computer performance, large commercial CFD software has been more and more widely used and has become a sharp tool for wind turbine aerodynamic performance research [3]. This paper takes NREL 5 MW wind turbine as the research object. The numerical simulation calculation model only considers the wind turbine part, without considering the influence of engine compartment and tower.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
