Experimental investigation of effects of spanwise segmented blowing on a circulation control wing with a dual-radius flap

The aim of this study is to explore the efficacy of spanwise segment blowing in an attempt to reduce the mass flow requirements while improving aerodynamic efficiency. For this study a modified NACA0012 wing with three plena is chosen. Direct force and 2D PIV measurements are collected at three spanwise locations to examine the impact of segmented on demand blowing. Further stereoscopic PIV measurements are conducted to investigate the aerodynamic effects of individual blowing, dual blowing, and uniform blowing configurations on wake dynamics. The results of the force measurements combined with the 2D PIV measurements demonstrate that only one-third of the mass flow is required when employing segmented blowing while maintaining the same lift and rolling moments coefficients. Stereo-PIV measurements reveal that initially the tip vortex is stronger, but increased blowing intensifies the root vortex, eventually surpassing the tip vortex. The results also showed that only the adjacent plenum has an effect on the root vortex, whereas the tip vortex is influenced by blowing from all three plenums, underscoring its sensitivity to interactions across multiple locations.