Akademik Veri Yönetim Sistemi
34th Congress of the International Council of the Aeronautical Sciences, ICAS 2024, Florence, İtalya, 9 - 13 Eylül 2024
This paper unveils a numerical simulation of the aerodynamic characteristics of crescent wings across a range of high Reynolds numbers varying from 2×107 to 4×107. The study also explores the influence of the crescent wing’s zero-sweep line on its aerodynamic performance. The wing sections of all models are NACA64A-010 airfoils. The turbulent flow is resolved by k - ω SST turbulence model. The methodology involves a validation process, aligning numerical simulations with wind tunnel experiments documented in existing literature, and they are in close agreement. The results indicate that all wings show sensitivity to Reynolds number variation. As the Reynolds number increases, the lift-to-drag ratio increases whereas the parasite drag decreases. Moreover, the maximum lift-to-drag ratio and parasite drag of the crescent wings are close to each other. On the other hand, the elliptic wing exhibits a lower lift-to-drag ratio and higher parasite drag characteristics. Oswald’s efficiency factor values are greater than 0.9 at α=4°. As evident in the vorticity field and sectional aerodynamic coefficients, the flow separation near the wing tip is observed at α=10° for all wings except the elliptical one at Reynolds number of 2×107 to 3×107. The severity of this separation considerably increases at 4×107 as it emerges the rise in the sudden peak of the sectional drag coefficient. This smooth separation characteristic of the elliptic wing leads to significantly lower induced drag than the crescent wings.