The vortex generator jets provide an adaptive control action under various flow changes because the strength of longitudinal vortices can be adjusted by varying the jet speed. Longitudinal vortices are generated by the interaction between jets and a crossflow. Jets in a crossflow provide complex interacting flow that contains many vortices (e.g. wake, horseshoe and hairpin vortices) in the near field of the jet where the three-dimensional interaction between the jet and crossflow is intense. In this study, structural features resulting from the interaction of a jet issuing transversely into a crossflow are described with the help of flow visualization technique and hot-wire anemometry. For the normal jet, the presence of a wake behind the jet in a crossflow is observed and it was confirmed that the origin and formation of the vortices in the wake were affected by crossflow Reynolds numbers and the jet-to-crossflow velocity ratios.

View full abstract