Abstract
Among the various active flow control techniques, Plasma Synthetic Jet (PSJ) actuators, or Sparkjets, represent a very promising technology, especially because of their high velocities and short response times. A practical tool, employed for design and manufacturing purposes, consists of the definition of a low-order model, lumped element model (LEM), which is able to predict the dynamic response of the actuator in a relatively quick way and with reasonable fidelity and accuracy. After a brief description of an innovative lumped model, this work faces the experimental investigation of a home-designed and manufactured PSJ actuator, for different frequencies and energy discharges. Particular attention has been taken in the power supply system design. A specific home-made Pitot tube has allowed the detection of velocity profiles along the jet radial direction, for various energy discharges, as well as the tuning of the lumped model with experimental data, where the total device efficiency has been assumed as a fitting parameter. The best fitting value not only contains information on the actual device efficiency, but includes some modeling and experimental uncertainties, related also to the used measurement technique.
Highlights
Plasma Synthetic Jet (PSJ) actuators, or Sparkjets, are able to produce very high jet velocities, without the aid of any moving parts, affecting the structure of the flow-field to be controlled and allowing a positive variation of the aerodynamic forces on an aircraft
A specific home-made Pitot tube has allowed the detection of velocity profiles along the jet radial direction, for various energy discharges, as well as the tuning of the lumped model with experimental data, where the total device efficiency has been assumed as a fitting parameter
A plasma synthetic jet actuator is a device developed at the beginning of the century [1], which soon has become the object of study of several research groups [2,3]
Summary
Plasma Synthetic Jet (PSJ) actuators, or Sparkjets, are able to produce very high jet velocities, without the aid of any moving parts, affecting the structure of the flow-field to be controlled and allowing a positive variation of the aerodynamic forces on an aircraft. A plasma synthetic jet actuator is a device developed at the beginning of the century [1], which soon has become the object of study of several research groups [2,3]. It is mainly composed of 2 or 3 electrodes embedded in a small cavity linked to the external environment through an orifice. Following the research line of the lumped models [14], which are very useful for design and manufacturing practical purposes, a novel physical model, able to predict the time variation of all thermodynamic quantities in the cavity as well as the jet velocity at the orifice, was reported in [15]. PSJ actuator, composed of two parts in Macor and two tungsten electrodes, with major details on the power supply system and the tuning procedure of the lumped model for the prediction of PSJ actuator efficiency performance based on the total pressure measurements
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