Horizontal axis wind turbine rotor blade: winglet and twist aerodynamic design and optimization using CFD

Download

index.pdf

Date

2011

Author

Elfarra, Monier Ali

Metadata

Show full item record

Item Usage Stats

426
views

308
downloads

The main purpose of this study is to aerodynamically design and optimize winglet, twist angle distribution and pitch angle for a wind turbine blade using CFD to produce more power. The RANS solver of Numeca Fine/Turbo was validated by two test cases, the NREL II and NREL VI blades. The results have shown a considerable agreement with measurements for both cases. Two different preconditioners have been implemented for the low Mach number flow. The results have shown the superiority of Merkle preconditioner over Hakimi one and Merkle was selected for further simulations. In addition to that, different turbulence models have been compared and the Launder – Sharma has shown the best agreement with measurements. Launder – Sharma was chosen for further simulations and for the design process. Before starting the design and optimization, different winglet configurations were studied. The winglets pointing towards the suction side of the blade have yielded higher power output. Genetic algorithm and artificial neural network were implemented in the design and optimization process. The optimized winglet has shown an increase in power of about 9.5 % where the optimized twist has yielded to an increase of 4%. Then the stall regulated blade has been converted into pitch regulated blade to yield more power output. The final design was produced by a combination of the optimized winglet, optimized twist andbest pitch angle for every wind speed. The final design has shown an increase in power output of about 38%.

Subject Keywords

Horizontal axis wind turbines, Wind turbines, Wind turbines-, Guided missiles

URI

http://etd.lib.metu.edu.tr/upload/12612987/index.pdf
https://hdl.handle.net/11511/21223

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Aerodynamic optimization of horizontal axis wind turbine blades by using CST method, BEM theory and genetic algorithm Oğuz, Keriman; Sezer Uzol, Nilay; Department of Aerospace Engineering (2019) In this thesis, an aerodynamic design and optimization study for rotor airfoils and blades of Horizontal Axis Wind Turbines (HAWTs) is performed by using different airfoil representations and genetic algorithm. Two airfoil representations, the Class-Shape Transformation (CST) method and the Parametric Section (PARSEC) method, are used for the airfoil geometry designs. Their aerodynamic data is obtained by a potential flow solver software, XFOIL. The Blade Element Momentum (BEM) theory is used to calculate t...
Dynamic modeling, control and adaptive envelope protection system for horizontal axiswind turbines Şahin, Mustafa; Yavrucuk, İlkay; Department of Aerospace Engineering (2018) In this thesis study, a wind turbine envelope protection system is introduced to protect turbines throughout the below and above rated regions. The proposed protection system, which is based on a neural network, adapts to various turbines and operational conditions. It can keep the turbine within pre-defined envelope limits whenever a safe operation is about to be violated. The avoidance is realized by control limiting technique applied to the blade pitch controller output, thereby adjusting the blade pitch...
Development of a high fidelity finite element model of a wind turbine blade via modal testing Amer, Chadi; Şahin, Melin; Department of Aerospace Engineering (2015) The design of an optimised horizontal axis 5-meter-long wind turbine rotor blade, is a research and development project, in order to fulfil the requirements of high efficiency torque-from-wind production. For this purpose, a research study is presented here, by investigating the structural characteristics of a composite wind turbine blade via finite element modelling and experimental modal analysis. At first, modal tests are performed by using various sensor-actuator pair combinations. After that the geomet...
Dynamic modelling and simulation of a wind turbine Altuğ, Ayşe Hazal; Yavrucuk, İlkay; Department of Aerospace Engineering (2015) In this thesis, a dynamic model for a horizontal axis wind turbine is developed for an upwind configuration using the MATLAB/Simulink environment. Blade Element Momentum Theory is used to model the rotor. It is assumed that the rotor blades are rigid and wind speed is uniform. Aerodynamic and gravitational forces are calculated as distributed loads. Verification of the model is done by using the LMS Samtech, Samcef for Wind Turbines software. Aerodynamic properties of the blades, sectional loads and moments...
Genetic algorithm based aerodynamic shape optimization of wind turbine rotor blades using a 2-d panel method with a boundary layer solver Polat, Özge; Tuncer, İsmail Hakkı; Sezer Uzol, Nilay; Department of Aerospace Engineering (2011) This thesis presents an aerodynamic shape optimization methodology for rotor blades of horizontal axis wind turbines. Genetic Algorithm and Blade Element Momentum Theory are implemented in order to find maximum power production at a specific wind speed, rotor speed and rotor diameter. The potential flow solver, XFOIL, provides viscous aerodynamic data of the airfoils. Optimization variables are selected as the sectional chord length, the sectional twist and the blade profiles at root, mid and tip regions of...

Citation Formats

M. A. Elfarra, “Horizontal axis wind turbine rotor blade: winglet and twist aerodynamic design and optimization using CFD,” Ph.D. - Doctoral Program, Middle East Technical University, 2011.