Synthetic Jets as a Boundary Vorticity Flux Control Tool

摘要

Numerical simulations performed in this study of a synthetic jet on a flat plate demonstrated the viability of synthetic jets as a boundary vorticity flux (BVF) control tool. The extent of synthetic jet BVF control was localized to regions around the synthetic jet exit slot and the spatial lengths of these control regions were estimated. It was found that their lengths and locations were heavily dependent on slot orientation, and synthetic jet actuation led to a net streaming of vorticity from these control regions. Least control was observed for the 90 deg slot as the local stream-wise flow velocity was unaltered with actuation solely imparting a cross-stream velocity. However, synthetic jet actuation increased and decreased the stream-wise flow velocity respectively for 45 and 135 deg resulting in stronger and larger control regions. In addition to orientation large BVF values observed on and near the slot edge indicated that slot shape is also an important parameter for BVF control.