DRAG INVESTIGATION AROUND A CYLINDER AND SYMMETRIC AIRFOIL IN TANDEM WITH DIFFERENT GAPS AND ANGLES OF ATTACK

Author(s): 

Humam M. Salih, Mustafa A. Abdulhussain

Affiliation(s): 

Mechanical Engineering Department, University of Technology, Iraq.

*Corresponding Author Email: humsalih2@gmail.com, mustafa_ahmed2018@yahoo.com

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

A Numerical simulation for the turbulent airflow around a symmetrical airfoil (NACA 0012) adjusted in tandem with circular cylinder, the airfoil were adjusted at variable angle of attack between (5-20°) with positive clockwise inclination setting the cylinder center in front of the leading-edge centroid using the realizable K-ɛ turbulent model in the ANSYS FLUENT 17 package is performed. The effect of changing the adjusted tandem bodies’ configuration, gap (0.05-0.1) and the cylinder size variation on the flow pressure distribution and the airfoil drag coefficient were investigated. The simulation considered in free stream uniform velocity of (25 m/sec) at standard atmospheric pressure. The results showed that using a cylinder with diameter equal to leading edge diameter causes more pressure drop as the tandem gap decreased, noticing that this effect becomes more significant at a high angle of attack. A valuable reduction in drag coefficient of this configuration is achieved and it becomes more with a smaller cylinder diameter with respect to gap distance.