Experimental study of the vortex flow and aerodynamic characteristics of a reverse delta wing

Abstract

The vortex and aerodynamic characteristics of a reverse delta wing (RDW) were investigated by using particle image velocimetry (PIV) in conjunction with flow visualization and force balance measurements. The RDW had a delayed stall but a lower lift and drag compared to the regular delta wing. The stalling mechanism of RDW was triggered by the breakdown of the multiple spanwise vortex filaments developed over its upper wing surface. The RDW vortex was found to be located outside the wing, and vortex rollup was completed at x/ c = 0.7. The PIV crossflow measurements were also used to compute the lift coefficient. Finally, depending on angle of attack, the RDW vortex can remain concentrated and axisymmetric or resemble a circulation-like flow with patches of vorticity.