The simplest aerodynamic model of horizontal-axis wind turbines is the blade element momentum theory, which assumes that blades behave as airfoils, but a correct two-dimensional representation an infinite cascade lifting bodies. This study analyzes conventional and impulse forms forces on cascades airfoils at spacings pitch angles typical turbine applications. OpenFOAM software was used to simu...

To indicate the best airfoil profile for different sections of a blade, five airfoils; included S8xx, FFA and AH series was studied. Among the most popular wind power blades for this application were selected, in order to find the optimum performance. Nowadays, modern wind turbines are using blades with multi airfoils at different sections. SST-K-ω model with different wind speed at large scale...

Horizontal axis wind turbines suffer from aerodynamic inefficiencies in the blade root region (near the hub) due to several non-aerodynamic constraints. Aerodynamic interactions between turbines in a wind farm also lead to significant loss of wind farm efficiency. A new dual-rotor wind turbine (DRWT) concept is proposed that aims at mitigating these two losses. A DRWT is designed that uses an e...

Previous studies on wind turbine and farm optimization for Levellized cost of energy (LCOE) annual production (AEP) have focused horizontal axis turbines (HAWT) vertical (VAWT). Regions with lower speed resources tend to a higher levellized production. In this paper, the authors investigate novel, Ferris wheel (FWT) low regions Africa. The research used an Excel-based Multi-Objective Optimizati...

Surface pressure data from the National Renewable Energy Laboratory’s “Unsteady Aerodynamics Experiment” were analyzed to characterize the impact of threedimensionality, unsteadiness, and flow separation effects observed to occur on downwind horizontal axis wind turbines (HAWT). Surface pressure and strain gage data were collected from two rectangular planform blades with S809 airfoil crosssect...

Modern designs for straight-bladed vertical axis wind turbines (VAWTs)feature smaller individual footprints than conventional horizontal axis wind turbines (HAWTs), allowing closer spacing of turbines and potentially greater power extraction for the same wind farm footprint. However, the wakes of upstream turbines could persist far enough to affect the performance of closely-spaced downstream t...

Wind turbines are typically classified as Horizontal Axis Turbines (HAWT) or Vertical (VAWT). VAWT has a superior ability to accelerate from rest rotation than HAWT, allowing it rotate the rotor even when wind speed is low; additionally, produced torque relatively high. Using Savonius helix one of numerous methods for enhancing performance. The effect number blades and blade twist angle on bott...