Transverse electric discharges in supersonic air flows: Simulation of the effects influencing the heating of gas in discharge channel

Gromov, V. G.; Ershov, A.P.; Левин, В. А.; Шибков, В.М.

doi:10.1007/s10740-006-0022-2

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…They include (1) highly transient behavior of discharge filaments, resulting in a complex pattern of their interaction with the flow, and ( 2) non-local nature of plasma-flow interaction, controlled by relatively slow vibrational-translational (V-T) relaxation (compared to gas dynamic processes) and delayed temperature rise. Similar phenomena have been observed in volumetric transverse arc discharge sustained in a high-speed flow, studied by Shibkov et al [170]. Samimy et al [146,162,171] used repetitively pulsed localized arc filament plasma actuators (LAFPA) to excite flow instabilities, such as the jet column instability.…”

Section: Dynamics Of Surface DC Discharge In Airflowsupporting

confidence: 59%

Dynamics of near-surface electric discharges and mechanisms of their interaction with the airflow

Leonov

Adamovich

Soloviev

2016

Plasma Sources Sci. Technol.

183

143

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The main focus of the review is on dynamics and kinetics of near-surface discharge plasmas, such as surface dielectric barrier discharges sustained by AC and repetitively pulsed waveforms, pulsed DC discharges, and quasi-DC discharges, generated in quiescent air and in the airflow. A number of technical issues related to plasma flow control applications are discussed in detail, including discharge development via surface ionization waves, charge transport and accumulation on dielectric surface, discharge contraction, different types of flow perturbations generated by surface discharges, and effect of high-speed flow on discharge dynamics. In the first part of the manuscript, plasma morphology and results of electrical and optical emission spectroscopy measurements are discussed. Particular attention is paid to dynamics of surface charge accumulation and dissipation, both in diffuse discharges and during development of ionization instabilities resulting in discharge contraction. Contraction leads to significant increase of both the surface area of charge accumulation and the energy coupled to the plasma. The use of alternating polarity pulse waveforms accelerates contraction of surface dielectric barrier discharges and formation of filamentary plasmas. The second part discusses the interaction of discharge plasmas with quiescent air and the external airflow. Four major types of flow perturbations have been identified: (1) low-speed near-surface jets generated by electrohydrodynamic interaction (ion wind); (2) spanwise and streamwise vortices formed by both electrohydrodynamic and thermal effects; (3) weak shock waves produced by rapid heating in pulsed discharges on sub-microsecond time scale; and (4) nearsurface localized stochastic perturbations, on sub-millisecond time, detected only recently. The mechanism of plasma-flow interaction remains not fully understood, especially in filamentary surface dielectric barrier discharges. Localized quasi-DC surface discharges sustained in a high-speed flow are discussed in the third part of the review. Although dynamics of this type of the discharge is highly transient, due to its strong interaction with the flow, the resultant flow structure is stationary, including the oblique shock and the flow separation region downstream of the discharge. The oblique shock is attached to a time-averaged, wedge-shaped, near-wall plasma layer, with the shock angle controlled by the discharge power, which makes possible changing the flow structure and parameters in a controlled way. Finally, unresolved and openended issues are discussed in the summary.

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Section: Dynamics Of Surface DC Discharge In Airflowsupporting

confidence: 59%

Dynamics of near-surface electric discharges and mechanisms of their interaction with the airflow

Leonov

Adamovich

Soloviev

2016

Plasma Sources Sci. Technol.

183

143

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“…The major properties of the Quasi-DC near-surface discharge in terms of its authority for high-speed flow control may be highlighted as follows: (1) realization of a transient Quasi-DC discharge in a dense compressible flow occurs as a result of a strong interference between the moving gas and ionization; (2) the process of plasma contraction is of significant importance for Quasi-DC discharge generation; (3) despite the transient nature of the Quasi-DC plasma the related displacement layer and the oblique shock wave in a supersonic flow are rather stationary; (4) the flow separation on a plane wall downstream of the plasma occurs due to vibrational-translational (VT) relaxation and molecular recombination, leading to a retarding pattern of the energy transfer from electric field to pressure increase. Similar phenomena in different geometric arrangements have been depicted for a volumetric transversal arc discharge in a high-speed flow, explored by Shibkov et al [25]. Samimy et al [26,27,28] have employed localized arc filament plasma actuators (LAFPA) in a fundamentally unsteady manner to influence flow stability.…”

Section: Introductionmentioning

confidence: 63%

Controllable Shock Wave Generation by Near-Surface Electrical Discharge

Leonov

Houpt

Hedlund

et al. 2016

47th AIAA Plasmadynamics and Lasers Conference

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This experimental work explores the physical processes related to an interaction of a nearsurface Quasi-DC (Q-DC) electrical discharge with supersonic airflow. The study is performed in the Supersonic Test Rig SBR-50 at the University of Notre Dame at Mach Number M = 2, stagnation pressure P0 = 0.9-2.6 Bar, stagnation temperature T0=300K, Reynolds Number ReL = 7-25 10 6 m -1 , test cell dimensions 76×76×610mm with 1º two walls divergence, and plasma power W= 5-16 kW. The plasma power and temperature are measured with current-voltage probes and optical emission spectroscopy. An unsteady pattern of interaction is depicted by high-speed image capturing. The result of the interaction is characterized by means of pressure measurements and schlieren visualization. It is demonstrated that the plasma generation causes the appearance of a wedge-shaped displacement layer and an oblique shock wave (SW). The strength of the SW is a rising function of the plasma power; the position of the impinged zone on the opposite wall can be electronically regulated. The resulting pressure amplification has been described for the configurations included; both a fixed SW generator and the plasma-based SW generator. It is considered that the Q-DC discharge may be employed for active control of duct-driven flows, cavity-based flow, and, finally, for control of ignition / flameholding in a supersonic combustor.

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“…One of these is the organization of supersonic gas pumping in the glow discharge area. Gas-dynamic aspects of the interaction of a transverse glow discharge with a supersonic flow in a heat source model based on the Navier-Stokes equations were numerically studied in [1]. Axisymmetric flows are calculated for a uniform oncoming flow.…”

Section: Introductionmentioning

confidence: 99%

Spatial Structure of Gas Dynamic Characteristics In A Glow Discharge With A Supersonic Axisymmetric Gas Flow

Тимеркаев

Petrova

Shamsutdinov

et al. 2022

J. Phys.: Conf. Ser.

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The paper presents the results of theoretical calculations of the gas-dynamic parameters of a supersonic flow in an axisymmetric Laval nozzle for the case when the central body removed from the nozzle serves as one of the glow discharge electrodes. It is shown that the presence of a supersonic flow makes it possible to establish a stationary inhomogeneous density of gas particles between the cathode and the anode of a glow discharge. The density of gas particles near the cathode and anode may differ by tens of times. The results of the study of the glow pattern of a discharge with a supersonic gas flow are presented. The dependence of the characteristics of the glow discharge on the distribution of inhomogeneous gas density in the interelectrode region is revealed. This effect opens up new possibilities for the use of discharges with supersonic gas flow for nanocoating and synthesis of nanostructures.

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Transverse electric discharges in supersonic air flows: Simulation of the effects influencing the heating of gas in discharge channel

Cited by 7 publications

References 2 publications

Dynamics of near-surface electric discharges and mechanisms of their interaction with the airflow

Dynamics of near-surface electric discharges and mechanisms of their interaction with the airflow

Controllable Shock Wave Generation by Near-Surface Electrical Discharge

Spatial Structure of Gas Dynamic Characteristics In A Glow Discharge With A Supersonic Axisymmetric Gas Flow

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