查詢結果分析
相關文獻
頁籤選單縮合
題 名 | Aerodynamic Performance and Shedding Characteristics on a Swept-Back Wing |
---|---|
作 者 | Yen, Shun-chang; | 書刊名 | Journal of Marine Science and Technology |
卷 期 | 19:2 2011.04[民100.04] |
頁 次 | 頁162-167 |
分類號 | 447.55 |
關鍵詞 | Swept-back wing; Vortex shedding; Aerodynamic coefficients; |
語 文 | 英文(English) |
英文摘要 | 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 (Rec) on the vortex shedding and aerodynamic coefficients. A hot-wire anemometer was applied to measure the vortex-shedding frequency. The projected Strouhal number (Std) at various angles of attack was determined and discussed. The relationship between Std and α is regressed as: Std = -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 (CL) increases with α in the separation bubble and leading-edge bubble regimes. The maximum increase rate of CL with respect to α (d(CL)/dα) is 1.52 π/rad. Occurring in the leadingedge bubble regime. However, the maximum increase rate of drag coefficient (CD) with respect to α (d(CD)/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. |
本系統中英文摘要資訊取自各篇刊載內容。