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Inspired by insect flight, oscillatory motion with pitching and plunging has been studied, and tandem configurations have been explored to enhance propulsive efficiency. As a first step in analyzing a...n oscillating tandem airfoil configuration, tandem airfoils are modeled as stationary. The present study investigates the aerodynamic effects of pitching angles on a tandem airfoil system using two NACA airfoil profiles, NACA 0030 and NACA 4412. While numerical studies have examined wing profiles and pitching angles, experimental analyses are relatively scarce due to their cost and time intensiveness. This study aims to complement existing numerical data and provide new insights into the aerodynamic performance of tandem airfoils. Experimental investigations are conducted in a wind tunnel for pitching angle combinations of the front and rear airfoils of 5°-10°, 5°-15°, and 10°-15°. The findings indicate that increasing the pitching angle of the tandem foil oscillation system results in a higher drag coefficient (𝐶_𝑑) and lift coefficient (𝐶_𝑙). For the NACA 4412 profile, the maximum 𝐶_𝑑 and 𝐶_𝑙 values were obtained at a pitching angle of 10°- 15°, with 𝐶_𝑑 = 1.553 and 𝐶_𝑙 = 2.0565. The NACA 0030 profile exhibits a decreasing trend in 𝐶_𝑑 with increasing pitching angle, reaching a maximum 𝐶_𝑑 = 0.883 at 5°-10°, while 𝐶_𝑙 increases with pitching angle, peaking at 𝐶_𝑙 = 0.619.続きを見る
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