Transient ejection phase modeling of a Plasma Synthetic Jet actuator

Abstract

For several years, a promising Plasma Synthetic Jet actuator for high-speed flow control has been under development at ONERA. So far, its confined geometry and small space-time scales at play have prevented its full experimental characterization. Complementary accurate numerical simulations are then considered in this study in order to provide a complete aerothermodynamic description of the actuator. Two major obstacles have to be overcome with this approach: the modeling of the energy deposited by the electric arc and the accurate computation of the transient response of the cavity generating the pulsed jet. To solve the first problem, an Euler solver coupled with an electric circuit model was used to evaluate the energy deposition in the cavity. Such a coupling is performed by considering the electric field between the two electrodes. The second issue was then addressed by injecting these source terms in large Eddy simulations of the entire actuator. Aerodynamic results were finally compared with Schlieren visualizations. Using the proposed methodology, the temporal evolution of the jet front is remarkably well predicted. C 2014 AIP Publishing LLC. [http://dx.

Effect of slotted exit orifice on performance of plasma synthetic jet actuator

“…Prior to breakdown, the discharge channel can be treated as an infinite resistor and all the capacitor voltage is applied on the gap. During ignition, a spark (arc) is formed and resistance of the discharge channel drops significantly from ~∞ to 0 (100 mΩ) (Laurendeau et al 2014). Note that the discharge capacitor is not an ideal capacitor.…”

Characterisation of plasma synthetic jet actuators in quiescent flow

“…Currently few studies are concerned with the evolution of detailed flow structures (vortex rings, shock waves) pertinent to this type of actuators [19,[36][37][38].…”

Experimental and numerical response of a high-Reynolds-number M=0.6 jet to a Plasma Synthetic Jet actuator

“…Dufour et al (2013) proposed a source model in order to evaluate the energy deposition in the cavity. Laurendeau and Chedevergne (2014) analyzed the synthetic jet produced in a quiescent medium through Schlieren visualization and performed Large Eddy Simulations with the former source model, showing remarkable comparisons.…”

“…Recently, a detailed modeling of the PSJ actuator has been developed at ONERA, coupling an energy deposition model in the cavity with a simulation of the response of the entire actuator in quiescent air through LES (Dufour et al, 2013;Laurendeau and Chedevergne, 2014). A second objective of this article is thus to perform a detailed numerical simulation of the interaction of a PSJ actuator with the jet experimentally studied, using this complete aerothermodynamic modeling of the actuator.…”

“…During the past decade, a plasma actuator similar to the SparkJet actuator developed at Johns Hopkins University (Grossmann et al, 2003) has been designed at ONERA, referred to as Plasma Synthetic Jet (PSJ) actuator (Belinger et al, 2014;Laurendeau and Chedevergne, 2014). This actuator generates a transient synthetic microjet at sufficiently high frequencies to be considered as a candidate for control of high-Reynolds-number high-speed jets.…”