Characterization of inclined oscillating jet and crossflow interaction for use in active flow control

PIV experiments were conducted to understand the interaction of an inclined fluidic oscillator jet and crossflows across a range of different blowing ratios. The fluidic oscillator used in the current study featured rounded internal feedback channels and produced a spatially oscillating jet at a predictable frequency. When integrated into aerodynamic bodies, fluidic oscillators have the potential to re-energize boundary layers and delay the onset of flow separation at high angles of attack. Understanding the effects of blowing ratios on mixing characteristics and turbulent interactions in the flow can shed light on the effectiveness of such fluidic oscillators for active flow control purposes. A fluidic oscillator with an aspect ratio of 2 and inclination angle of 30° was designed and tested at different mass flow rates through the jet for a given freestream condition. The variation in the subsequent interactions produced with varying jet velocity, relative to the crossflow, were considered. For the considered blowing ratios, the development and convection of high momentum regions were observed across the flow field. For a higher blowing ratio, the downstream propagation of these regions was accompanied by larger spanwise and wall-normal jet penetration into the boundary layer.