Nonequilibrium Plasma Aerodynamics

Starikovskiy, Andrey; Aleksandrov, N. L.

doi:10.5772/22396

Cited by 39 publications

(38 citation statements)

References 65 publications

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“…In these discharges, the reduced electric field is several times higher than the breakdown threshold and the deposited energy is spent on the excitation of high-threshold electronic states of molecules and on their dissociation and ionization. This is useful for a number of non-equilibrium plasma applications including plasma-assisted ignition and combustion [4][5] and high-speed flow control [6,7].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Nonequilibrium Plasma Generation and Plasma-Assisted Ignition for Different C2 Hydrocarbons

Starikovskiy

2016

47th AIAA Plasmadynamics and Lasers Conference

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The results of the experimental and numerical study of high-voltage nanosecond discharge afterglow in pure methane, ethane and propane are presented for room temperature and pressures from 2 to 20 Torr. Time-resolved electron density during the plasma decay was measured with a microwave interferometer for initial electron densities in the range between 3×10 11 and 3×10 12 cm -3 and the effective recombination coefficients were obtained. Measured effective recombination coefficients increased with gas pressure and were much higher than the recombination coefficients for simple molecular hydrocarbon ions. The properties of plasma in the discharge afterglow were numerically simulated by solving the balance equations for charged particles and electron temperature. Calculations showed that electrons had time to thermalize prior to the plasma decay. The assumption that cluster hydrocarbon ions are formed during the plasma decay explained the pressure dependence of the measured effective recombination coefficients. It was shown that the loss of electrons was controlled by the dissociative recombination with cluster ions at room electron temperature. Based on the analysis of the experimental data, the rates of three-body formation of cluster ions and recombination coefficients for these ions were estimated.

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Section: Introductionmentioning

confidence: 99%

Comparative Study of Nonequilibrium Plasma Generation and Plasma-Assisted Ignition for Different C2 Hydrocarbons

Starikovskiy

2016

47th AIAA Plasmadynamics and Lasers Conference

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“…Experiments and calculated-theoretical estimates [1][2][3] point to great prospects for using electric discharges in practice to control aerodynamic parameters of aircraft and to improve the effi ciency of propulsion systems.…”

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confidence: 98%

Study of the Effect of Decrease in the Conductivity Ahead of a Shock Wave in a Glow-Discharge Plasma

Baryshnikov

Basargin

Bobashev

et al. 2016

J Eng Phys Thermophy

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The electrical conductivity of a glow-discharge plasma ahead of a shock wave moving perpendicularly to the discharge axis has been investigated using a double electric probe. The obtained results have shown that the interaction of the shock wave with the glow-discharge plasma is accompanied by a change in its conductivity in the entire investigated volume simultaneously.Keywords: shock wave, glow discharge, plasma, double electric probe.Investigation of the interaction of various electric discharges with hypersonic fl ows of rarefi ed gases is a topical problem of modern plasma gasdynamics. Experiments and calculated-theoretical estimates [1-3] point to great prospects for using electric discharges in practice to control aerodynamic parameters of aircraft and to improve the effi ciency of propulsion systems.One line of these investigations is studying the interaction between shock waves and a glow discharge [3][4][5][6][7][8]. The infl uence of a shock wave on the plasma conductivity ahead of the front of this wave was reported even in the early studies [4,5]. However, for different reasons the accuracy of measurements in the indicated studies was low. In [4], the position of the shock wave relative to the probe signal was determined from the results of measurements performed in various experiments, which decreased the measurement accuracy. In [5], use was made of the microwave-interferometry method of low spatial resolution, as a result of which the accuracy of localization of the shock wave was low.The current study aims at investigating the effect of reduction in the conductivity of a glow-discharge plasma ahead of a shock wave by local measurements of its conductivity using a double electric probe with simultaneous recording of the position of the shock wave.Experiments were conducted on a plasma-gasdynamic setup whose diagram is shown in Fig. 1. In the working chamber of the setup of diameter 300 mm and height 400 mm in an air atmosphere at a pressure of 4 kPa, a steady-state gas discharge is set between two conic electrodes: anode 1 and cathode 2 disposed vertically at a distance of 100 mm from each other. Cathode 2 together with the working chamber is grounded, and the anode is connected to the external voltage source ensuring a discharge current of 1.1 A at an electrode voltage of 650 V. The discharge has the shape of a body of revolution with an increasing cross section in the direction to the cathode. A distinctive feature of this experimental setup is that in it, the discharge is implemented in the free space away from the chamber walls. The diameter of the cross section of the discharge midsection is less than 1/3 diameter of the working chamber.A shock wave is formed by electric-discharge shock tube 3 with an inside diameter of 30 mm and a length of 700 mm. The tube axis X intersects the discharge axis at a right angle in the middle of the discharge gap. Opposite the shock tube and coaxially with it is electric probe 4, which can move along the shock-tube axis. The coordinate X is reckoned from the c...

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“…Due to the limited induced velocities produced by AC driven surface plasma devices, the primary focus of AC driven plasma based flow control has been on low freestream velocity (< 30 m/s) and low Reynolds number flows (Re 10 5 ). AC driven dielectric barrier devices have not yet been shown to exert sufficient control authority for alleviating helicopter retreating blade stall (RBS), which is characterized by free stream velocities on the order of 100 m/s (Mach 0.30) and Reynolds numbers on the order of 10 6 [6].…”

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confidence: 99%

“…Boundary layer separation control by nonequilibrium non-thermal plasma was reviewed in [3] and [4]. In addition, the recent reviews [5,6] includes many results of all mechanisms (thermal, electrostatic and MHD) related to applications for flow control in the subsonic and supersonic regimes.Conventional plasma actuators are based on applying AC sinusoidal voltages to induce dielectric barrier discharges. Such devices affect flows via induced velocities, or ion wind, that are typically less than 10 m/s.…”

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confidence: 99%

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Experimental Investigation of Dynamic Stall in a Wide Range of Mach Numbers by Plasma Actuators with Combined Energy/Momentum Action

Starikovskiy

2016

47th AIAA Plasmadynamics and Lasers Conference

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Increased interest in plasma assisted flow control is reflected by a dramatic increase in publication rate over the past decade, including numerous demonstrations of plasma-assisted flow control. Many of these have been summarized in several topical reviews published recently. For example, possibilities of supersonic flow control (including shock wave attenuation and shock configuration change) by plasma were discussed in [1]. Drag reduction at high speed by energy deposition was discussed in paper [2]. Boundary layer separation control by nonequilibrium non-thermal plasma was reviewed in [3] and [4]. In addition, the recent reviews [5,6] includes many results of all mechanisms (thermal, electrostatic and MHD) related to applications for flow control in the subsonic and supersonic regimes.Conventional plasma actuators are based on applying AC sinusoidal voltages to induce dielectric barrier discharges. Such devices affect flows via induced velocities, or ion wind, that are typically less than 10 m/s. Due to the limited induced velocities produced by AC driven surface plasma devices, the primary focus of AC driven plasma based flow control has been on low freestream velocity (< 30 m/s) and low Reynolds number flows (Re 10 5 ). AC driven dielectric barrier devices have not yet been shown to exert sufficient control authority for alleviating helicopter retreating blade stall (RBS), which is characterized by free stream velocities on the order of 100 m/s (Mach 0.30) and Reynolds numbers on the order of 10 6 [6].As an alternative to AC voltage inputs, nanosecond pulse driven plasma actuators in which voltage is applied in pulses at a specific frequency and with a specific on-time have been proposed for separated flow control [7][8][9]. Nanosecond pulsed periodic dielectric barrier devices have been experimentally demonstrated to affect separated flows over a range of Mach numbers (0.03 M 0.85) and Reynolds numbers (10 4 Re 2 10 6 ) that are consistent with retreating blade flows. Furthermore, the nanosecond pulsed actuators tested to date have required less than 10 Watt per cm. of wing span [9], and therefore are energy efficient. Dielectric barrier discharge development and thrust generation in a wide pressure rangeExperiments at reduced pressure conditions demonstrate the discharge geometry change almost inversely proportional to the gas pressure. Plasma layer thickness, and discharge propagation length increase with the gas pressure decrease. This means the plasma energy density decrease in the discharge region proportional to the gas pressure decrease. Major assumptions on the discharge structure dependence on the pressure and pulse voltage were confirmed in a wide pressure range from 0.1 to 10 atm. Low-pressure chamber (505080 cm 3 ) was used for low-pressure experiments. The chamber allows an excellent optical access to the object through multiple viewports; the removable top provides precise positioning and focusing of the optical systems.

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Nonequilibrium Plasma Aerodynamics

Cited by 39 publications

References 65 publications

Comparative Study of Nonequilibrium Plasma Generation and Plasma-Assisted Ignition for Different C2 Hydrocarbons

Comparative Study of Nonequilibrium Plasma Generation and Plasma-Assisted Ignition for Different C2 Hydrocarbons

Study of the Effect of Decrease in the Conductivity Ahead of a Shock Wave in a Glow-Discharge Plasma

Experimental Investigation of Dynamic Stall in a Wide Range of Mach Numbers by Plasma Actuators with Combined Energy/Momentum Action

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