1. References Conclusions Objectives Blade Profile Analysis For Wind Turbines With Ansys Software Ferit YILDIZ 1, Anıl Can TURKMEN 2, Cenk CELİK 3 Kocaeli University, Faculty of Engineering, Department of Mechanical Engineering, 41380, Kocaeli 1 ferit.yldz@hotmail.com, 2 anilcan.turkmen@hotmail.com, 3 cenkcelik@kocaeli.edu.tr ferit.yldz@hotmail.com anilcan.turkmen@hotmail.com cenkcelik@kocaeli.edu.tr When selecting the material of the blades, lightness and durability are kept in the forefront. GPR (glass fiber reinforced plastics) are the most commonly used material. Beside this material epoxy, carbon fiber, aramid etc. are used, but these materials aren’t economical and the use of them are restricted. Fatigue and weight problems of steel or aluminum alloy, prevent its use in large turbines. For this reason, these materials are mainly used for small wind turbines. Weight of the used NACA 2415 profile is 1,02 kg and the one of the rectangular profile is 7,22 kg. Materials are common to both profiles and it is a polyurethane with the density of 160,185 kg / m3. When making comparisons, blade profiles were studied and features like flow, pressure and velocity were taken into consideration. Analysis were performed according to the weather and wind conditions at 1000 meters. The turbine inlet velocity was taken as 37 km/h and the outlet velocity was taken as 24,6 km/h. In this study, the flow, pressure and velocity distribution analysis of NACA2415 and 30x120mm rectangular profile is made. SOLIDWORKS was used for modeling of the blade profile and ANSYS was used for the analysis. Airfoil has a great importance in aeronautics. Profiles which are found in different types, was standardized by NACA codes. These profiles are selected depending on the application and aeordynamic properties of them increases the efficiency of wind turbine. This article will examine the advantages and disadvantages of the blade profiles. Profiles with different shapes from each other were selected to observe clearly analysis results. Cross-section of a profile was studied in two dimensions, and comparisons were made in accordance to the results. 0°pitch angle was taken during the analysis. Thus, neglecting the advantages of the angle, let the focus entirely on the performance of the profile. In this study, blades with NACA and rectangular profiles were examined. Previously it was said that the weight of the NACA 2415 is 1,02 kg and the weight of the rectangular profile is 7,22 kg. With the effect of the sharp corners in the rectangular blade, irregularities in the flow is visibly and according to NACA profile, which has a softer shape, retention amount of wind is very much. The force required to move the turbine is related to the inertial moment. This force will be greater for the rectangular profile, because the inertial moment of it is greater than NACA 2415’s. With the conclusions drawn from the analysis, both weight and aerodynamic advantages for NACA 2415 is observed. As seen, profiles have a substantial effect on wind turbines. When large-scale wind turbines are considered, the importance of the weight is too big and researchers are always consider this issue. Future targets are to increase the efficiency of the turbine with more durable and lightweight material. Abstract Methods 1.Modelling and Control Design of Pitch-Controlled Variable Speed Wind Turbines, Wind Turbines 2.Wind Turbines, Wind Energy Systems 3.Wind Turbine Power-The Betz Limit and Beyond, Benefits of Wind Energy PP- 042 NACA and Rectangular Profile Streamlines When the stream lines in figure 1 is analyzed, the lines that are passing over the profile are separated from each other naturally, and they return to their original state in a very short interval. We see that this interval is larger in figure 2. Ensuring laminar flow, so that the distance after leaving the profile of the stream line is as short as possible, will affect the obtained energy from the wind positively. 4.Wind Turbine Design to Meet Domestic electrical needs, Master Thesis 5.2-D Aerodynamics, Aerodynamics of Wind Turbines 6.Variability of Wind and Wind Power, Wind Power 7. An Experimental Study of the Shapes of Rotor for Horizontal-Axis Small Wind Turbines, Wind Turbines 8. A Ducted Horizontal Wind Turbine for Efficient Generation, Wind Turbines 9. Special Issues on Design Optimization of Wind Turbine Structures, Wind Turbines NACA and Rectangular Profile Velocity NACA and Rectangular Profile Total Pressure 6 2 34 5 1 Looking at the velocity distribution at back (output) part of the profiles, it’s 7 – 8m/s for figure 4 and for figure 3 it’s 4 – 5m/s. If the maximum speeds assumed to be equal, the biggest difference between maximum speed and output speed is seen in the NACA 2415 profile. According to the law of conversation of energy, the input and output energies are equal. Here, the energy depending on the input speed is equal to the energy that depends on the output speed and to the energy generated in the wind turbine. The more is the difference between the maximum speed and output speed, the bigger is the energy left on the turbine. Actually it is necessary to pay attention to the pressure which is formed in regions close to the surface. In figure 6, a large area of negative pressure is seen clearly. The most influential factors in the creation of this negative pressure is turbulence. The resulting vortex changes the direction of the pressure and disrupt the flow. This isn’t the case for figure 5 or it is small enough to be neglected according to figure 6.