The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Wind turbine wakes effects are critical issues for large wind farms. With the increasing dimensions of wind turbines and wind farms, there are strong interactions between the wind turbine wakes and atmospheric boundary layer (ABL). In this study, we focus on the daily variation of characteristics of ABL and its impact on the development of wind turbine wakes. To investigate this issue, a series of...
Power loss caused by wind speed deficit in wind turbine wake is a critical issue for wind farms. Various engineering wake models have been developed and applied to predict velocity distribution in wind turbine wake and wind farm power production. In this study, three widely used wind turbine wake models, Jensen, Frandsen and Larsen model, were compared and validated, in order to find out prediction...
Vortex generators (VGs) are commonly-used effective flow separation control devices, and are proved to have potential to improve the aerodynamic performance of large wind turbines. In this paper, the flow physics of VGs and how their size affects the aerodynamic performance of a blunt trailing-edge airfoil DU97-W-300 have been investigated using CFD simulations. Based on wind turbine dedicated airfoil...
In wind farms, the performance of downstream wind turbines is significantly affected by the upstream turbine wakes. In this study, we focus on the wake interactions of two horizontal-axis wind turbines, and the separation distance has been investigated using a Reynolds-averaged Navier-Stokes (RANS) framework. Three models for two in-line turbines arranged with different separation distances have been...
With the up-scaling of wind farms, wake effect has become a major factor which restricts wind power generation. Accurate simulation of the wind turbine wake velocity decay is of great significance to improve the current situation. Against the limitation of the neutral atmospheric hypothesis in wake simulation, the impact of atmospheric stability is taken into consideration in this paper. Establish...
Wind shear inflow conditions with different indices lead to different wind speed distributions in wind turbine wakes, which further affects the power output of downstream turbines. In this study we focus on wind turbine wake considering different inflow shear indices. The three-dimensional numerical simulation, based on the full NREL 5-MW wind turbine model, was implemented with the RNG k-epsilon...
Wind turbine wakes and their interactions with atmospheric boundary layer (ABL) flows have a significant impact on the performance of wind turbines and wind farms, and thus it is essential to understand the flow dynamics imposed by ABL flows and wind turbine wakes. In this study, we focus on the impact of ambient turbulence on wind turbine wakes in the neutral ABL. Full rotor models, including the...
Gurney flap and trailing-edge wedge are useful devices to improve the aerodynamic performance of aerofoils for wind turbines; however, the researches on blunt trailing-edge aerofoil are limited. In this paper, we focus on the flow mechanism of Gurney flaps and trailing-edge wedges and their impacts on a blunt trailing-edge aerofoil DU97-W-300. Two-dimensional Computational Fluid Dynamics (CFD) models...
Vortex generators and trailing-edge wedges are proposed to be adopted simultaneously to enhance aerodynamic performance of a blunt trailing-edge airfoil for wind turbines. To understand the impact and physics of these two devices on airfoil performance, investigation was carried out by numerical simulation on DU97-W-300 using CFD. Three-dimensional models, including baseline models, models fitted...
In recent years, the accuracy of the wind power prediction has been urgently studied and improved to satisfy the requirements of power system operation. In this paper, the relevance vector machine (RVM)-based models are established to predict the wind power and its interval for a given confidence level. An NWP improvement module is presented considering the characteristic of NWP error. Moreover, two...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.