Abstract. A wind turbine blade equipped with root spoilers is analysed using time domain aeroelastic element momentum (BEM) simulations to assess the impact of passive devices on annual energy production (AEP) and lifetime. Previous 2D computational fluid dynamics (CFD) showed a large unsteadiness in aerodynamic coefficients associated spoiler, such behaviour captured by OpenFAST when all degre...

Abstract In this paper, a new design of small horizontal-axis wind turbine is introduced. The based on the authors’ patent, which uses permanent magnets impeded into shroud that holds rotor blades. generator coils are installed fixed diffuser houses and acts as concentrator. Therefore, has no hub direct coupling for electricity generation. main features have been explored to highlight advantage...

An experimental and numerical investigation about the pitch imbalance effect on a wind turbine model is performed. The characterization of power losses loads generated small-scale validation an analytical framework for performance unbalanced rotors are proposed. Starting from optimal collective assessment (performed to identify condition with maximum coefficient), just one blade was systematica...

The dominant feature in the acoustic spectrum of a propeller-driven aircraft is the spectral line corresponding to the propeller blade rate that is equal to the product of the propeller shaft rotation rate and the number of blades on the propeller. The frequency of this line, when measured by a stationary observer on the ground, changes with time due to the acoustical Doppler effect. In this pa...

Currently, wind energy, a reliable, affordable, and clean energy source, contributes to 16% of Europe’s electricity. A typical modern turbine design lifespan is 20 years. In European Union countries, the number turbines reaching years or older will become significant beyond 2025. This research study presents methodology aiming upgrade rotor blades for existing extend life. employs blade element...

This article introduces a novel Induction Blade (IB) prototype modeled by Element Momentum (BEM) theory, which develops higher torque during the starting phase for Horizontal Axis Wind Turbines (HAWT), especially micro-turbines. The IB is composed of two parallel blades joined at their tips and roots, forming distinctive hole in space between that generates Venturi effect as air passes through....

In the present thesis the wake flow behind wind turbines is analyzed numerically using large-eddy simulations. The wind turbine rotors are modeled by using either the actuator disc method or the actuator line method in which the blades are represented by body forces computed with airfoil data. Using these models, the boundary layers of the turbine blades are not resolved and most of the computa...

Development of new technologies and combined with creativity and innovation, plays the fundamental role in developing of any community′s value. Thus, in this research the design and production of hydroforming device was introduced. One of the best and most efficient technologies in the world of metal forming is wind turbine blade producing with hydroforming method which seems as an innovative m...

This paper examines the importance of load phase angle variations with respect to fatigue damage. The operating loads on a generic three bladed up-wind 1.5-MW wind turbine blade were analyzed over a range of operating conditions, and an aggregate probability distribution for the actual phase angles between the peak in-plane (lead-lag) and peak out-ofplane (flap) loads was determined. Using a fi...

Blade vortex interaction (BVI) noise has been recognized as the primary determinant of the helicopter’s far field acoustic signature. Given the limitations of design in eliminating this dynamic phenomenon, there exists a need for control. We believe that this paper is the first model-based effort to attempt the same. We present herein the application, first of feedback control strategies, and t...