Abstract
A synthetic jet is one of flow control devices that can topologically disturb flow field. It can be applied to downsized fluid machinery without a net mass injection for its simplified structure. The study provides quantitative classification of vortex regimes of synthetic jet in quiescent fluid. The vortex structure was measured by scanning stereoscopic PIV. The Stokes number S and non-dimensional length of strokes L were used as evaluation parameters. According to the vorticity distribution, vortex rolls more neighboring fluid when S and L are large. No jet regime is defined as the case that a ratio of maximum velocity at suction phase to maximum velocity at njection phase is smaller than 0.05. Vortex roll up regime is defined as the case that the distance between the vortex centers of ring vortex by jet orifice diameter D (= 1.0 mm) is larger than 1.1. Without vortex roll up regime is middle region between No jet and Vortex roll up. Consequently, a parameter map of vortex regimes of synthetic jet as functions of S (= 6.3 〜 12.7) and L(= 0.25 〜 10) is obtained.
