- 期刊
Aerodynamic Performance and Shedding Characteristics on a Swept-Back Wing
並列摘要
A NACA 0012 finite swept-back wing with a sweep-back angle of 15° was utilized to investigate the effects of angle of attack (α) and the chord Reynolds number (Re(subscript c)) on the vortex shedding and aerodynamic coefficients. A hot-wire anemometer was applied to measure the vortex-shedding frequency. The projected Strouhal number (St(subscript d)) at various angles of attack was determined and discussed. The relationship between St(subscript d), and α is regressed as: Si(subscript d)=-0.0008 α+0.209, for 22°＜α＜90°. Four characteristic surface-flow patterns: separation bubble, leading-edge bubble, bubble burst, and turbulent separation were classified by changing α and Re. The behavior of surface-flow structures significantly affects the lift, drag, and moment coefficients. The lift coefficient (C(subscript L)) increases with α in the separation bubble and leading-edge bubble regimes. The maximum increase rate of C(subscript L) with respect to α(d(C(subscript L))/dα) is 1.52 π/rad. Occurring in the leading-edge bubble regime, However, the maximum increase rate of drag coefficient (C(subscript D)) with respect to α (d(C(subscript D))/dα) is 0.49 π/rad. Occurring in the bubble-burst regime. The steep-drop of moment coefficient at stall in the unswept-wings is not observed in the swept-back wings.
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