Experimental investigation of a novel two-dimensional synthetic jet

The novel signal wave pattern realized by changing the suction duty cycle factor K for a two-dimensional synthetic jet was investigated experimentally with a two-dimensional particle image velocimeter (PIV) system in quiescent flow. The development and evolution of the vortex pair trajectories, jet velocity, jet width, flow flux and momentum flux were obtained for different K values. It is found that the distributions of the mean and turbulent flow fields for synthetic jets generated at different K values have similar features to those exhibited for the conventional synthetic jet. Moreover, the vortex pairs generated in the present way have larger convection velocity, stronger entrainment and higher momentum at larger K, which would be of benefit for flow control applications.