Not exist
Saleh R. Abdussalam Gashoot, M.L.Ayari(5-1998)

Abstract Wind turbines are the means of converting wind energy into electrical energy. It is not unexpected that certain brands of horizontal wind turbines are optimally designed for certain wind speed regimes prevailing at certain sites. It has been the objective of this study to find out whether it is possible to design a wind turbine that is more suitable for a site of lower annual mean wind speed such as the western coast of Libya. In achieving this objective, use was made of a typical wind turbine aerodynamic design and performance analysis procedure together with actual wind speed data recorded at the city of Misurata.Based on the annual wind energy yield obtained from different designs of wind turbines having different rated wind speeds and different blade design tip speed ratios, this study indicates that the decrease of the rated wind speed leads to a continuous increase of annual energy yield as well as an increase of the cost of the wind turbine. Therefore the optimum value of rated wind speed for this site may only be determined as a compromise between added wind energy yield and added cost. Moreover, for any given rated wind speed this study indicates that a blade design tip speed ratio equal to six seems to be the optimum value for the given site.
محمد على نايلي (2015)

Abstract Estimation of wind characteristics is considered as the first essential step to evaluate a wind energy project based on information about all aspects of the implementation and operation of the project. It's therefore necessary to have detailed knowledge of the wind to design a suitable wind turbine for a certain zone and also to estimate its performance accurately. The first step in this thesis is study the wind energy and wind assessment in the selected site (Zuara) based on the available wind data, which are obtained from the representative meteorological station. The second step in this thesis is study is to design a suitable horizontal axis wind turbine. Design (HAWT) to achieve satisfactory levels of performance starts with knowledge of the aerodynamic forces acting on the blades. The blade element momentum theory (BEM) is applied for HAWT blade design and to predict the performance of the rotor. A computer program for HAWT blade design and its performance analysis is belt. The input of this program is: power required from a turbine, number of blades, design wind velocity, design tip-speed ratio and properties of the selected airfoil. While the output are: blade geometry parameters (chord and twist distribution), power, torque and thrust coefficients versus tip-speed ratios. This study indicates that capacity factor on the Zuara site equal 3 and it is seen that possible to designed wind turbine to extracting the power from the wind with satisfactory levels of performance in the selected site
فرج الأخضر شنشن (2014)