| Since its commercialization as a mean of mass transportation, the design and development process of an aircraft mainly focus on increasing its speed and/or size. The shape and configuration of aircraft wing, which is the primary device for lift generation, have remained generally unchanged. This research aims to analyze the effects of angle of attack and stagger, which is the streamwise distance between the forewing and the rear wing, in tandem wing configuration on the propulsion generated by the wings. The analysis is conducted numerically using ANSYS Fluent version 17.1 on two-dimensional (2D) NACA 0012 tandem airfoils at three variations of stagger, 1.5-, 2-, and 3-chord in laminar (Re = 2 x 103) and turbulent flow (Re = 6 x 106). The result of this study is that the tandem wing configurations flying in a turbulent flow regime experience an increase in total lift (the total lift of fore- and rear wing) and a decrease in total drag (the total drag of fore- and rear wing) in cases where the angle of attack of the rear wing is greater than that of the forewing. However, this increase in lift diminishes as the stagger increases. In laminar flow, tandem wing configuration must be arranged in certain combination of angle of attack and stagger to gain significant advantages. |