Numerical Simulation of Wake Deflection Control around NACA0012 Airfoil Using Active Morphing Flaps

• 作者: Tomonaga Okabe
• 来源期刊: 流量控制、测量及可视化(英文)
• 学科: 物理学
• 关键词: Flow Control Wake Deflection Control VORTEX Morphing Flap Direct Numerical Simulation Unsteady Flow Simulation
• 年，卷（期）: 2020,（3）
• 页码范围: 121-133
• 页数: 13页
• 分类号: O35

摘要

This study demonstrates an active flow control for deflecting a direction of wake vortex structures behind a NACA0012 airfoil using an active morphing flap. Two-dimensional direct numerical simulations are performed for flows at the chord Reynolds number of 10,000, and the vortex pattern in the controlled and noncontrolled wakes as well as the effect of an actuation frequency on the control ability are rigorously investigated. It is found that there is an optimum actuation-frequency regime at around <em>F ⁺</em> = 2.00 which is normalized by the chord length and freestream velocity. The wake vortex pattern of the well-controlled case is classified as the 2P wake pattern according to the Williamson’s categorization [<a href="#ref1">1</a>] [<a href="#ref2">2</a>], where the forced oscillation frequency corresponds to the natural vortex shedding frequency without control. The present classification of wake vortex patterns and finding of the optimum frequency regime in the wake deflection control can lead to a more robust design suitable for vortex-induced-vibration (VIV) related engineering systems.