scholarly journals EVOLUTIONARY DESIGN OF WIND TURBINE BLADES

2014 ◽  
pp. 49-55
Author(s):  
V. Diaz Casas ◽  
R. J. Duro ◽  
F. Lopez-Pena
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Design Procedure ◽  
Evolutionary Process ◽  
Automatic Design ◽  
Design Environment ◽  
Wind Turbine Blades ◽  
Integral Boundary ◽  
Blade Element Theory ◽  
Element Theory

An automatic design environment is implemented for the aerodynamic design of wind turbine blades. This tool involves the integration of evolutionary techniques and a simple, fast, and robust aerodynamic simulator which was developed for the prediction of the performance of any turbine blade produced by the evolutionary process. The aerodynamic simulator is based on blade element theory in which a panel method is combined with an integral boundary layer code to calculate the blade airfoils’ characteristics. In order to reduce computations some simplifications have been applied and the results corrected by means of the application of neural network based approximations. Results of the simulations obtained using this technique, of the application of the automatic design procedure and of the operation of the wind turbines thus obtained are presented.

Aerodynamic and Structural Design of Composite Wind Turbine Blades

2012 ◽  
Vol 268-270 ◽  
pp. 1294-1298 ◽  
Author(s):  
Guang Hua Chen ◽  
De Tian ◽  
Ying Deng
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Three Dimensional ◽  
The Finite Element Method ◽  
Three Dimensional Model ◽  
Wind Turbine Blades ◽  
Blade Element Theory ◽  
Composite Blade ◽  
Coordinate Conversion ◽  
Element Theory

With 3MW composite blade wind turbine blade as an example, according to the momentum blade element theory, optimized the design of aerodynamic shape, established the Three-dimensional model of blade through coordinate conversion, and made the stress check of structure and modal analysis using the finite element method, and more detailed description of the design methods and techniques of large composite wind turbine blades

Wind Turbine Blade Structure Parameterization Using T4T

2014 ◽  
Author(s):  
Giorgos A. Strofylas ◽  
Georgios I. Mazanakis ◽  
Ioannis K. Nikolos
Keyword(s):  
Wind Turbine ◽  
Parametric Design ◽  
Turbine Blades ◽  
Design Procedure ◽  
Software Tool ◽  
Computational Procedure ◽  
Physical Parameters ◽  
Wind Turbine Blades ◽  
Definition Of ◽  
Cloud Of Points

A software tool named “T4T” (Tools for Turbomachinery) has been developed for the parametric design of turbomachinery and wind turbine blades. The complete design procedure is object-oriented and parametric, providing the ability to the user to define various types of blades. It has been developed in QT C++, utilizing OpenCascade graphical and computational libraries. The software allows the user to design the outer surface either by specifying some physical parameters for each blade section, or by directly interpolating a surface through a cloud of points. The new/enhanced version of “T4T” software tool, introducing the definition of internal blade structure for wind turbines rotors, is fully parametric and customizable, allowing the user for defining the internal blade structure, including shear webs. The computational procedure finally produces compound solids, which can be further imported to mesh generation and analysis software through standard geometry exchange protocols, for cooperation with CFD and CSD solvers.

Preliminary Design of Wind Turbine Blades for Manufacture Using Local Capabilities

2001 ◽  
Author(s):  
Sarim N. Al-Zubaidy ◽  
Jacqueline Bridge ◽  
Alwyn Johnson
Keyword(s):  
Energy Source ◽  
Growth Rate ◽  
Wind Energy ◽  
Wind Turbine ◽  
Fluid Dynamic ◽  
Turbine Blades ◽  
Design Procedure ◽  
Wind Turbine Blades ◽  
Horizontal Axis Wind Turbine ◽  
Average Deviation

Abstract In the past ten to fifteen years wind energy remerged on the world scene with a very healthy growth rate, it has outstripped photovoltaics (solar cells) as the world’s fastest growing energy source, with a growth rate in excess of 30 percent per annum. No longer just a “nice idea for the future” Wind energy is becoming a mainstream energy source for many countries. The proposed paper will present a procedure (using numerical methods) for the design and analysis of Horizontal Axis Wind Turbine (HAWT) rotors. To ascertain the accuracy and to determine where further improvements could be initiated; numerical findings were then compared with published experimental test data and the compression showed an average deviation of less than 3% and therefore the simplifying assumptions made for the prediction of fluid behavior over an airfoil section was justified. Once the approach was validated and standardised a comprehensive airfoil design was produced. A computational fluid dynamic code coupled with a simple numerical algorithm aided the inverse design procedure. The final design was well proportioned and was theoretically able to meet the stated objective function and satisfied all the imposed constraints (manufacturing and geometrical). The geometrical data was then generated in a form suitable for manufacture using manually and numerically controlled machines.

scholarly journals Wind turbine wake vortex influence on safety of small rotorcraft

2019 ◽  
Vol 123 (1267) ◽  
pp. 1374-1395
Author(s):  
Berend G. van der Wall
Keyword(s):  
Wind Turbine ◽  
Rotor Blade ◽  
Safety Concern ◽  
Turbine Blades ◽  
Wake Vortex ◽  
Wind Turbine Blades ◽  
Blade Element Theory ◽  
Rotor Disk ◽  
Lifting Surfaces ◽  
Turbine Wake

ABSTRACTThe wake vortex of lifting surfaces such as wind turbine blades or fixed-wing aircraft can heavily affect the blade aerodynamics of rotorcraft. Using blade element theory, the pilot control inputs required to mitigate such vortex effects are estimated and compared to the available control margin at the operating condition of interest. In contrast, when no pilot action is performed, the rotor blade flapping caused by the vortex is evaluated and compared to available margins. It is a safety concern when the remaining margins become zero. The influence of the vortex strength, its core radius and orientation to the rotor disk are evaluated and the effect of rotor blade characteristics (Lock number, natural frequency) is investigated.

Adaptive Geometry Wind Turbine Blades for Increasing Performance

2010 ◽  
Author(s):  
Leonardo C. Albanese ◽  
Farhan Gandhi ◽  
Susan W. Stewart
Keyword(s):  
Energy Production ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Dominant Effect ◽  
Energy Capture ◽  
Blade Element Theory ◽  
Wind Speeds ◽  
Optimal Geometry ◽  
Element Theory ◽  
Blade Element

With wind turbines working to capture energy at different wind speeds rotor morphing could potentially increase energy capture over wind speeds up to the rated speed. This study examines what the optimal geometry might look like at different wind speeds, how it might differ from one speed to another, and how much increase in power and annual energy production could be realized with the optimal geometry at each wind speed. Using a blade-element theory based analysis and conducting simulations on the 1.5 MW WindPACT turbine and the 5MW NREL concept turbine, variations in blade twist and collective pitch, chord, radius, and airfoil characteristics were considered. The results indicate that there are negligible benefits to changing blade collective pitch, twist, chord, and airfoil characteristics. Only radius increase has a dominant effect, with 20% increase in radius resulting in power increase of over 45% at 8 and 10 m/s and much higher percentage increases at lower speeds, for both turbines. The increase in annual energy production is in the range of 20%. However, a larger radius increases rotor thrust.

Use of Forward Dynamics Model for Designing Large-Size Wind Turbine Blades

2013 ◽  
Author(s):  
Ahmed H. Bayoumy ◽  
Ayman A. Nada ◽  
Said M. Megahed
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Length Distribution ◽  
Design Procedure ◽  
Chord Length ◽  
Horizontal Wind ◽  
Practical Case ◽  
Wind Turbine Blades ◽  
Large Size ◽  
Bem Theory

In this paper, the Blade Element Momentum (BEM) theory is used to design the horizontal wind turbine blades. The design procedure concerns the main parameters of the axial/angular induction factors, chord length, twist/attack angles, and local power/thrust coefficients. These factors in turns affect the blade aerodynamics characteristics and efficiency at the corresponding nominal speed. NACA 4-digits airfoil geometry is obtained, using BEM theory, to achieve the maximum lift to drag ratios. The optimization of the power coefficient and its distribution versus different speeds is carried out by modifying the twist angle and chord length distribution along the blade span. The dynamic characteristics of both the original and optimized design are examined through forward dynamic simulation of the blade model. Since large-size wind turbine blade is considered, the dynamic model is established using the Absolute Nodal Coordinate Formulation (ANCF), which is suitable for large-rotation large-deformation problems. Finally, in order to verify the dynamic enhancements in the Aerodynamic/Structural properties, the fluid-solid interaction simulation for both the original and optimized model is performed using ANSYS code. The obtained results show a good rank of the proposed optimization procedure for a practical case of wind data upon Gulf of Suez-Egypt.

Experiments of Wind Turbine Blades with Rocket Triggered Lightning

2009 ◽  
Vol 129 (5) ◽  
pp. 689-695
Author(s):  
Masayuki Minowa ◽  
Shinichi Sumi ◽  
Masayasu Minami ◽  
Kenji Horii
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Triggered Lightning
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