低レイノルズ数周期流での NACA0012 翼周り剥離流れの PIV 解析

抄録

This paper presents a three-dimensional flow around NACA0012 in a periodic flow with a sinusoidal velocity profile in the streamwise direction. The measurement is conducted in a water tunnel under Reynolds number Re=3000, reduced frequency k = 2.3 and angle of attack 15° . The phase-averaged velocity field is measured by using Particle Image Velocimetry (PIV). Three dimensional phase-averaged u − v vector field is reconstructed by twenty-one x − y vector fields. Proper Orthogonal Decomposition (POD) is applied to identify dynamic structure at each phase. It is shown that low-order mode functions have large contribution when periodic velocity is maximum velcity.