Passive flow control effect using micro-cylinder on airfoil NACA 4415.

The energy crisis does not sound familiar today. Human dependence on conventional energy causes adverse effects such as greenhouse gas emissions and environmental pollution. Developing of new renewable energy as environmentally friendly energy is the solution to this problem. Many breakthroughs have been achieved regarding efficiency in developing new and renewable energy. The efficiency of the turbine blades is one of the most significant breakthroughs in achieving maximum performance. Therefore, this research was conducted as a breakthrough in achieving energy efficiency based on aerodynamic performance of airfoil. The computational Fluid Dynamics (CFD) method used to investigate the NACA 4415 airfoil with micro-cylinder adding. This study investigates the aerodynamic performance of airfoil with micro-cylinders with predetermined area and diameters. The variations of the micro-cylinder used are the installation of one micro-cylinder and the installation of two micro-cylinders. The Reynolds number used is 3×10⁶ with an AoA variation of 0-30. The installation of micro-cylinders in this study reduces the aerodynamic performance of the NACA 4415 airfoil. The decrease in airfoil performance can be seen in the inhibited increase in C_l airfoil caused by an excessive increase in C_d. The stall on the micro-cylinder installation is also not able to be appropriately inhibited. However, the performance of airfoil with one micro-cylinder began to appear after the airfoil stalled. In which C_l in the airfoil with one micro-cylinder increased by 37.91%. Meanwhile, the C_l airfoil with two micro-cylinders increased by 25.64%. [ABSTRACT FROM AUTHOR]