Abstract
Vorticity causes many adverse effects on the area near the surface, both on moving (turbine blade) and fixed objects. Therefore, this study attempts to investigate the effects of free-stream turbulence on trailing edge vortex on the NACA 0015 airfoil profile. This research was conducted using two-dimensional numerical simulations. To determine the interaction of vortex and free stream turbulence, two variations of turbulent intensity were given, namely 0.5% and 4.6% with Reynolds number of 1.6 x 105. The k-ε turbulence model was used in the current study. The angle of attack of the flow towards the airfoil was varied from 0° to 25° in conditions of increase and decrease in the horizontal position of the airfoil. The result was found that there is an agreement between the simulation and the experiment result. Increased turbulent intensity can delay the stall condition, the stall process begins to be observed after the 12° attack angle at 0.5% turbulent intensity while at turbulent intensity 4.6% the stall process was found after the 15° attack angle. From a velocity streamline, it was found that an increase in turbulent intensity can inhibit vortex growth.
Highlights
According to the projection of the International Energy Agency (IEA), up to 2030 world energy demand has increased by 45% or an average increase of 1.6% per year
The wind is one of the potential energy sources that can be used as renewable energy
Comparisons have been made to the profile of the NACA 0015 airfoil for the Reynolds number 1.6 x 105 with 2 and 25 attack angles at0.5% and 4.6% turbulent intensity
Summary
According to the projection of the International Energy Agency (IEA), up to 2030 world energy demand has increased by 45% or an average increase of 1.6% per year. Most or about 80% of the world's energy needs are supplied from fossil fuels [1]. The use of new renewable energy needs to be improved. The wind is one of the potential energy sources that can be used as renewable energy. Wind turbines utilize mechanical energy from the wind to produce electrical power [2]. One crucial part of a wind turbine is the blade because this part is directly related to the flow of wind. The wind turbine blade has a particular blade profile called an airfoil that determines the primary performance of the wind turbine [3]
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