Plasma Effect on Shocks Configuration in Compression Ramp

Leonov, Sergey B.; Firsov, A. A.; Yarantsev, Dmitry; Falempin, Russia Francois; Goldfeld, M. A.; Ras, Sb

doi:10.2514/6.2011-2362

Cited by 11 publications

(11 citation statements)

References 10 publications

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“…By applying a high voltage across the anode and cathode, a bright plasma filament appears above the two electrodes. With the impacting of incoming flow, the plasma occurs not only between the two electrodes but also several centimeters downstream on the wall [10]. In consideration of the oscillation character of its electrical parameters and mean temperature in Plasma Science and Technology -Basic Fundamentals and Modern Applications the discharge path, this type of discharge plasma is called "quasi-DC discharge plasma."…”

Section: Plasma Model and Its Configurationmentioning

confidence: 99%

“…However, it is a type of low temperature arc plasma in fact. The main properties of quasi-DC discharge plasma are described in [10][11][12]15].…”

Section: Plasma Model and Its Configurationmentioning

confidence: 99%

“…Hereby, the quasi-DC discharge plasma behaves as a virtual blockage in the high speed flow of scramjet combustor, which is called as "the dominant thermal blocking mechanism" [17]. On the foundation of dominant thermal blocking mechanism, the individual plasma filament can be simulated as a volumetric heat source [10,12].…”

Section: Plasma Model and Its Configurationmentioning

confidence: 99%

“…It has been widely considered that plasma-assisted combustion is one of the most promising approaches for enhancing ignition and combustion in the environment of scramjet combustion [4,6,9]. As a further promising method, there are three advantages, that is: rapid response, less inertia, and flexibility [10]. Former studies clearly show that the quasi-DC discharge plasma can availably modify supersonic flow in a controllable manner among the discharge plasma mentioned above [8,11], whereas the DBD plasma is commonly used in low-speed flow environment [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…There in three primary mechanisms of the plasma effect on flow and combustion can be summarized: (1) momentum transfer, (2) fast local ohmic heating of the medium, and (3) active particles [6,7,14]. Ignoring the magnetic field, the mechanism of quasi-DC discharge plasma affecting a supersonic flow is mainly its fast local heating rather than the electrostatic force (i.e., the momentum transfer mechanism) [10,15,16].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Plasma-Assisted Combustion

Zhou¹,

Wang²,

Nie³

et al. 2019

Plasma Science and Technology - Basic Fundamentals and Modern Applications

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As a promising technology, plasma-assisted combustion (PAC) has attracted many researchers to explore the effect of PAC on improving the combustion in propulsion devices, such as scramjet, detonation engines, internal engines, and so on. In this chapter, we aim to exhibit the influence of quasi-DC discharge plasma on the operating performance of scramjet combustor and find the internal mechanisms, which may contribute to the development of PAC technology in supersonic combustion. For case one, a plasma filament is generated upstream of fuel jet through quasi-DC discharge in a scramjet combustor; for case two, the plasma is formed across the backward facing step of a flame holding cavity to improve the flame stabilization of the cavity in the scramjet combustor. The two cases are investigated in detail through three-dimensional numerical simulation based on the dominant thermal blocking mechanism. Important parameters including temperature distribution, separation zone, water production, stagnation pressure loss, combustion efficiency, cavity drag, mass exchange rate, and cavity oscillating characteristics are obtained and analyzed. It shows that the quasi-DC discharge plasma does benefit for the improvement of the combustion in a scramjet combustor.

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Section: Plasma Model and Its Configurationmentioning

confidence: 99%

“…However, it is a type of low temperature arc plasma in fact. The main properties of quasi-DC discharge plasma are described in [10][11][12]15].…”

Section: Plasma Model and Its Configurationmentioning

confidence: 99%

Section: Plasma Model and Its Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Plasma-Assisted Combustion

Zhou¹,

Wang²,

Nie³

et al. 2019

Plasma Science and Technology - Basic Fundamentals and Modern Applications

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The manipulation of an unstarting supersonic flow by plasma actuator

Im¹,

Do²,

Cappelli³

2012

J. Phys. D: Appl. Phys.

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The manipulation of an unstarting supersonic flow is demonstrated using a dielectric barrier discharge (DBD). Experiments are carried out in a Mach 4.7 model inlet flow. Flow features, such as boundary layers and shockwaves at low freestream static pressure (1 kPa) and temperature (60 K) are visualized with Rayleigh scattering from condensed CO2 particles. Flow unstart, initiated by mass injection, is studied for three model inlet flow configurations, distinguished by the initial conditions (untripped or tripped, plasma actuated or not) of the boundary layers. Unstart in the presence of thick, tripped boundary layers is characterized by the formation of an oblique unstart shock just upstream of a separating and propagating boundary layer. The presence of plasma actuation of this tripped boundary layer seems to arrest the boundary layer separation and leads to the formation of a quasi-stationary pseudo-shock, delaying unstart. The flow generated with DBD actuation is more characteristic of what is seen when unstart is generated in a model flow in which thin boundary layers grow naturally. Planar laser Rayleigh scattering visualizations suggest that the DBD actuation thins the tripped boundary layer over the exposed electrode region.

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Aerodynamic actuation characteristics of radio-frequency discharge plasma and control of supersonic flow

Zhou¹,

Song²,

Wang³

et al. 2019

Chinese Phys. B

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In this paper, aerodynamic actuation characteristics of radio-frequency (RF) discharge plasma are studied and a method is proposed for shock wave control based on RF discharge. Under the static condition, a RF diffuse glow discharge can be observed; under the supersonic inflow, the plasma is blown downstream but remains continuous and stable. Time-resolved schlieren is used for flow field visualization. It is found that RF discharge not only leads to continuous energy deposition on the electrode surface but also induces a compression wave. Under the supersonic inflow condition, a weak oblique shock wave is induced by discharge. Experimental results of the shock wave control indicate that the applied actuation can disperse the bottom structure of the ramp-induced oblique shock wave, which is also observed in the extracted shock wave structure after image processing. More importantly, this control effect can be maintained steadily due to the continuous high-frequency (MHz) discharge. Finally, correlations for schlieren images and numerical simulations are employed to further explore the flow control mechanism. It is observed that the vortex in the boundary layer increases after the application of actuation, meaning that the boundary layer in the downstream of the actuation position is thickened. This is equivalent to covering a layer of low-density smooth wall around the compression corner and on the ramp surface, thereby weakening the compressibility at the compression corner. Our results demonstrate the ability of RF plasma aerodynamic actuation to control the supersonic airflow.

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Plasma Effect on Shocks Configuration in Compression Ramp

Cited by 11 publications

References 10 publications

Plasma-Assisted Combustion

Plasma-Assisted Combustion

The manipulation of an unstarting supersonic flow by plasma actuator

Aerodynamic actuation characteristics of radio-frequency discharge plasma and control of supersonic flow

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