Wake Measurements behind an Oscillating Airfoil in Dynamic Stall Conditions

Figure 8

PIV results for 𝛼=10^∘+10^∘sin(𝜔𝑡)  and  𝑘=0.1 (Re = 6×10⁵ and Ma = 0.09).

(a) 𝛼=18^∘ upstroke

(b) 𝛼=18^∘ downstroke

(c) 𝛼=16^∘ downstroke