Abstract
The eects of orifice lip shape and size were investigated experimentally for a round synthetic jet actuator. The actuator was a piston-cylinder apparatus with the jet issuing from an orifice in the end plate of the cylinder. Three orifice lip shapes and two orifice sizes were investigated. The lip shapes were straight, beveled, and round. For each orifice shape, PIV measurements were obtained in the jet flow-field as the jet stroke, L /D , and jet Reynolds number, ReU , were independently varied. Distinctly dierent phase-averaged and time-averaged flow-fields were observed for the dierent lip shapes. The orifice lip shape was found to aect the location and convection speed of the vortex ring that is formed at the orifice during each cycle of the actuator. There is spatial non-uniformity in the velocity profile at the orifice exit for each lip shape, and the profile resembles a top-hat only late in the expulsion portion of the actuator cycle. The mean flow shows clearly where the flow-field undergoes the transition from a train of vortex rings to a turbulent jet. The beveled orifice undergoes this transition farthest from the orifice, and exhibits the highest momentum and narrowest width of the three orifices.
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