Flow Control on a Finite Swept and Tapered Wing at a Low Reynolds Number

The effect of a steady or an unsteady jet on a finite span wing with 𝐴𝑅 = 2 at 𝑅𝑒𝑐 = 600 and angle of attack 𝛼 = 18𝑜 is demonstrated. The wing has a taper ratio 𝜆 ≈ 0.27 with an unswept leading edge and a trailing edge swept forward 30𝑜, which creates an inverted ram’s horn vortex post stall. The effect of three different jet orifice shapes (circular, elliptical, and rectangular) on the flow field were explored. The elliptical orifice is found to be the least intrusive to the flow. Additionally, the streamwise location of the jet was explored, where the effect of either a steady jet or an unsteady jet at 𝐶𝑏 = 1 and 𝐶𝑏 = 2 were compared. Both jets significantly reduced the extent of separation where the unsteady jet was more effective. The jet located near the separation line reduced separation by creating a virtual wall, outboard of which the flow was separated and inboard of the virtual wall the flow was mostly attached. In contrast, the jet located further upstream reduced separation mainly outboard of its spanwise location.