Axis switching in low to moderate aspect ratio rectangular orifice synthetic jets
Joseph Straccia, John Farnsworth
Abstract
The behavior and performance of synthetic jets is closely tied to the dynamics of vortex rings, which are a dominant feature of the early jet. When a synthetic jet actuator employs a non-axisymmetric orifice, the self-induced deformations of the vortex rings are responsible for changes in the shape, momentum distribution, and entrainment rate of the jet. In this study, axis-switching of vortex rings in finite-span synthetic jets with a range of orifice aspect ratios was experimentally investigated using stereoscopic particle imaging velocimetry, and the results were compared to vortex dynamics simulations based on the Biot-Savart law to gain additional insight.
Topics & Concepts
Body orificeSynthetic jetVortexVortex ringJet (fluid)Particle image velocimetryPhysicsMechanicsEntrainment (biomusicology)Aspect ratio (aeronautics)VelocimetryMomentum (technical analysis)Classical mechanicsTurbulenceActuatorAcousticsEngineeringMechanical engineeringFinanceRhythmElectrical engineeringOptoelectronicsEconomicsFluid Dynamics and Turbulent FlowsPlasma and Flow Control in AerodynamicsAerodynamics and Acoustics in Jet Flows