Offshore türbinlerde kullanılan bir rüzgar kanadı profili üzerindeki hava akışının karşılaştırmalı numerik analizi

It is obvious that renewable energy has started to gain more importance in the recent years with increasing concerns about environmental issues and security of energy supply. Wind energy is one of the most important sources in renewable energy. Having much more growth rate than onshore and with numerous advantages, offshore wind energy is believed to be next step in wind energy and the energy solution of the future. The research conducted in this thesis is motivated by the numerical analysis of NACA 64(3)618 blade profile of the offshore wind turbines which has been widely used in the wind energy sector recently. These analyses have been carried out by Ansys CFX and panMARE working according to different calculation methods. The effects of changing of the angle of attack on lift and drag coefficients have been examined for the blade profile. The numerical studies have been performed between -5o and 15o in different values of angle of attack. Besides, two different wind velocity ( 3 m/s and 11.4 m/s) are used in these studies. By this means, the effects of the altering wind velocity on the airflow around the blade profile have been investigated. The research report is composed of six chapters. In the first two sections, the information related to offshore wind turbine technology and wind energy are handled and also the scope of the thesis and the purpose are mentioned. After examining the key factors that effect wind energy in detail, the geometry and aerodynamics of airfoil and the characteristics of NACA profiles are discussed in the third part. Additionally, the information about the underlying methods of Ansys CFX and panMARE programs and their solution methods are presented. The fifth section covers the numerical analyses of NACA 64(3)618 airfoil by Ansys CFX and panMARE and the comparison of the results between these analyzers. The conclusion part and recommendations are addressed with key factors in the last part of the thesis.