翼型
升阻比
阻力
机械
边界层
Lift(数据挖掘)
雷诺数
NACA翼型
数学
航空航天工程
物理
计算机科学
工程类
湍流
数据挖掘
作者
Benoît Genest,Guy Dumas
出处
期刊:Journal of Aircraft
[American Institute of Aeronautics and Astronautics]
日期:2023-04-24
卷期号:: 1-15
摘要
The impact of single and double Gurney flaps of heights within the range of [Formula: see text] is determined for a typical symmetrical airfoil (NACA 0015) by numerical simulations using an unsteady Reynolds-averaged Navier–Stokes approach. The optimal scaling of the Gurney flap to maximize the lift-to-drag ratio of the airfoil is revisited and confirmed to depend on the boundary-layer thickness in the region where it is deployed. Appropriate scaling rules for both single and double Gurney flap are proposed. Studying the Gurney flap’s pressure distribution at a finely resolved level highlights its effect on the overall foil’s pressure distribution. Finally, the unsteady simulations carried out are harnessed to determine the shedding frequencies generated by the flaps and the flow structures associated with them, hinting at the physical mechanisms by which Gurney flaps may increase lift at a low drag cost, thus improving the lift-to-drag ratio of the airfoil.
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