The blades of axial-flow rotors, which are typically made flexible composite materials, can experience significant deformations through their operation. However, the impact these on rotor hydrodynamics is not well understood. Blade be separated into three main components: flapwise, a thrust-driven deformation in direction flow; edgewise, relatively small plane motion and driven by torque; twist...

As wind turbine diameters continue to increase, the cyclic loading experienced by blade due shear and yaw misalignment increases dramatically hindering development of larger more efficient turbines. Based on current literature, controlling a section trailing edge was found reduce loading. To quantify load control capability flap (TEF), an experimental rig designed evaluate TEF 3.5-m-diam operat...

Abstract In this paper, we study experimentally the fluid-structure interaction of a simplified small-scale rotor operating in water channel. The consists single untwisted rectangular blade and is tested with various pitch angles at different rotation speeds free stream velocities. Flapwise deformations are measured using image processing, flow fields obtained by Particle Image Velocimetry. exh...

In this paper, the sensitivity of the structural integrity of wind turbine blades to debonding of the shear web from the spar cap was investigated. In this regard, modal analysis, static and fatigue testing were performed on a 45.7 m blade for three states of the blade: (i) as received blade (ii) when a crack of 200 mm was introduced between the web and the spar cap and (iii) when the crack was...

This paper describes an easy-to-implement, proactive control strategy for wind turbines, incorporating constraints on blade loads. The control strategy is aimed for rejecting wind gusts and is based on upwind speed measurements and a new statistical wind gust detection mechanism. The control action comprises simultaneous driveline and collective pitch control with constraints on flapwise bendin...

Most small–medium-sized turbine studies have focused on presenting new design methods and corresponding performance improvements rather than detailed dynamic investigations. This paper presents comprehensive investigations of a straight swept-back blade for 100 kW by performing modal analysis, load flutter analysis. The considered cases include steady wind operational conditions under normal ex...

in the present paper axial distributions of plasma and floating potentials, electron and iondensities and eedf have been measured in the dl region of a hg discharge constriction. an attempt hasbeen made for the resolution of opposing charged layer structures in dl. excitation processes in theconstriction region are studied. using the linearization method for the nonstationary balance equationss...

This paper presents a newly developed aero-servo-elastic platform for implementing smart rotor control and shows its effectiveness with aerodynamic loads on large-scale offshore wind turbines. The platform was built by improving the FAST/Aerodyn codes with the integration of an external deformable trailing edge flap controller in the Matlab/Simulink software. Smart rotor control was applied to ...