Experimental Study of Vortex Flows over Delta Wings in Wing-Rock Motion

The phenomenon of wing rock was investigated using flow visualization in a water tunnel. Models with 70deg, 75-deg, 80-deg, and 85-deg sweeps were tested in a free-to-roll rig and a forced oscillation rig. Wing rock was observed to occur on various wings in the absence of asymmetric vortex liftoff, vortex breakdown, and static hysteresis. These phenomena are therefore not the necessary ingredients for wing rock. The presence of these phenomena, however, can have strong influence on characteristics such as the amplitude and frequency of wing rock.

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