Abstract A multi-unit floating offshore wind turbine concept, the wind-tracing turbine, is introduced. In this structure a triangular platform that hosts three 5 MW turbines and moored to seabed with turret-bearing mooring system. This system allows rotate about turret such total yaw moment by environmental load on minimized. study, optimum properties of lines location are determined. To identi...

Abstract Simulation of the complex, unsteady aerodynamics characterizing Darrieus rotors requires computational tools with a fidelity higher than ubiquitous Blade Element Momentum (BEM) theory. Among them, Actuator Line Method (ALM) stands out in terms accuracy and cost. This approach, however, still fails to resolve vortex-like structures shed at blade ends, overestimating turbine performance ...

This study presented a failure analysis of a 52.3 m composite wind turbine blade under static loading. Complex failure characteristics exhibited at the transition region of the blade were thoroughly examined and typical failure modes were indentified. In order to predict multiple failure modes observed in the tests and gain more insights into the failure mechanisms of the blade, a Finite Elemen...

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...

The reduction of wind turbine blade loads is an important issue in the reduction of the costs of energy production. Reduction of the loads of a non-cyclic nature requires so-called smart rotor control, which involves the application of distributed actuators and sensors to provide fast and local changes in aerodynamic performance. This paper investigates the use of synthetic jets for smart rotor...

Abstract Placing a diffuser around wind turbine can increase its power output, but not all mechanisms by which the alters aerodynamics have been investigated thoroughly. Here, we concentrate on one such mechanism: effect of finite number blades. In nearly blade element analyses turbines, effects are approximated Prandtl’s “tip loss factor” goes to zero at tip. We argue that this limiting behavi...

Three blade-geometry optimization models derived along with assumptions from the blade element momentum (BEM) approach are studied by using a steady BEM code to improve small horizontal-axis rotor of three blades that has been previously used in experiments. The base linear-radially varying chord length and pitch angle, while other noted as Burton, Implicit Hansen due their references character...

In order to improve the design accuracy of blade method a ducted fan based on element momentum theory, was modified by CFD calculation with higher propose an integrated and efficient for rotor stator. Firstly, fast established initial stator carried out. Then, performance designed calculated method, were redesigned according results. Such continuous iterations finally made results basically con...