Shadow method for measuring the average electron density in an ionized gas flow induced by a high-frequency barrier discharge

Khramtsov, P. P.; Penyazkov, O. G.; Doroshko, M. V.; Chernik, M. Yu.; Shikh, I. A.

doi:10.1007/s10891-009-0184-y

Cited by 2 publications

(5 citation statements)

References 20 publications

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“…Then a monotonic decrease in the temperature occurs as a consequence of the turbulent mixing with the ambient air. The data presented are in good agreement with the analogous results obtained in [2,5] for the barrier discharge on the surface of a flat plate.…”

Section: Discussionsupporting

confidence: 90%

“…The main tasks for researchers in this field are to increase the efficiency of actuators and develop a physical mechanism of influence of the barrier discharge on the flow characteristics. To attain these goals, experimental data on the electron density and temperature distribution, as well as on the averaged ionized gas temperature in the boundary layer, are needed.The results of investigating by optical methods the electron density of a dielectric barrier discharge plasma in stationary air are given in [1][2][3]. The measuring methods are based on the change in the optical density of the gas depending on the electron density.…”

mentioning

confidence: 99%

“…The results of investigating by optical methods the electron density of a dielectric barrier discharge plasma in stationary air are given in [1][2][3]. The measuring methods are based on the change in the optical density of the gas depending on the electron density.…”

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confidence: 99%

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Shadow method for measuring the electron density in a barrier discharge plasma on the Zhukovskii airfoil surface

Khramtsov

Penyazkov

Chernik

et al. 2011

J Eng Phys Thermophy

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We have measured the electron temperature and density distributions in an ionized gas flow initiated by a high-frequency barrier discharge on the Zhukovskii airfoil surface by the method of photometry of shadow patterns for two probe radiation wavelength λ r = 0.675 μm and λ b = 0.425 μm. The investigation was carried out in air at atmospheric pressure. The maximum value of the electron density was N e 2.2⋅10 15 cm −3 with an insignificant change in the air temperature in the discharge gap.Introduction. Controlling the boundary layer and the character of the flow around various bodies at a dielectric barrier discharge on their surface is a topical direction of investigations in modern aerodynamics. The main tasks for researchers in this field are to increase the efficiency of actuators and develop a physical mechanism of influence of the barrier discharge on the flow characteristics. To attain these goals, experimental data on the electron density and temperature distribution, as well as on the averaged ionized gas temperature in the boundary layer, are needed.The results of investigating by optical methods the electron density of a dielectric barrier discharge plasma in stationary air are given in [1][2][3]. The measuring methods are based on the change in the optical density of the gas depending on the electron density. In measuring the refractive index by the laser beam deflection in passing through the discharge region, the maximum electron density in the dielectric barrier discharge plasma was equal to N e 10 13 -10 14 cm −3 [1]. The maximum value of N e obtained by photometering the shadow patterns for two probe radiation wavelengths was equal to N e 4.5⋅10 15 cm −3 [2, 3].The authors of [4] have established that the temperature of electrons in a filamentary glow discharge is almost pressure independent, whereas the electron density increases with decreasing ambient air pressure. Under diffusion glow conditions both characteristics increase with decreasing pressure.According to the data presented in [5], the average electron density in the barrier discharge plasma at a pressure of 1 atm and a discharge electrode gap of 1 mm is N e 10 14 -10 15 cm −3 . The gas temperature in the discharge gap on going from diffusion to filamented glow discharge conditions increases from 300 to 500 K [6].In [7,8], the results of experimental measurements of the electron density and temperature by the spectral methods are presented. The electron density and temperature in the barrier discharge initiated in helium at a pressure of 760 Torr a frequency 10 kHz, and a voltage on the discharge electrodes of 2-4 kV, measured by the spectral method, were equal to N e 10 11 cm −3 and T e 1 eV. In [8], the characteristics of an asymmetric aerodynamic actuator based on the surface dielectric barrier discharge were investigated. From the point of view of the simplified collisional-radiative model for the N 2 molecule, the authors made calculations of the averaged temperature and density of electrons using the measurement data for the rad...

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Section: Discussionsupporting

confidence: 90%

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confidence: 99%

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Shadow method for measuring the electron density in a barrier discharge plasma on the Zhukovskii airfoil surface

Khramtsov

Penyazkov

Chernik

et al. 2011

J Eng Phys Thermophy

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“…At a residual air pressure in the vacuum chamber of 40 Torr, values T e 2.5⋅10 4 K and N e 2⋅10 15 cm −3 were obtained which agree well with the earlier obtained results [14,16].…”

supporting

confidence: 91%

“…The Zhukovskii aerofoil was mounted on an aerodynamic balance with the aid of four insulation pillars made from caprolon. The power for the barrier discharge was provided by a high-voltage generator [16]. The discharge electrodes on the aerofoil were connected to the generator via special vacuum high-voltage insulators.…”

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Characteristic features of a barrier discharge occurring on the zhukovskii aerofoil on variation of the surrounding air pressure

Khramtsov

Penyazkov

Grishchenko

et al. 2012

J Eng Phys Thermophy

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The results of measuring the jet thrust produced by a dielectric barrier discharge on the Zhukovskii aerofoil are presented. The measurements were made in the pressure range 40-1200 Torr. The maximum velocity of the ion wind attained 4-5 m/s. Based on the analysis of the plasma glow spectrum at a residual air pressure in the vacuum chamber of 40 Torr in the barrier discharge, the values of the temperature T e 2.5⋅10 4 K and of electron concentration N e 2⋅10 15 cm −3 were obtained.Introduction. The dielectric barrier discharge is widely applied in engineering, for example, in the development and engineering design of excimer ultraviolet and vacuum ultraviolet tubes [1], high-power CO 2 lasers [2], and plasma display units [3]. Industrial ozonizers have been developed on its basis [3]. The dielectric barrier discharge is also applied to stabilize flames [4] and improve the properties of polymer films [3].Considerable interest in the world has been directed towards the application of barrier discharge plasmas in aerodynamics. In this field, a study is actively carried out along three basic lines: control of boundary layer separation from the surface of flying vehicles [5][6][7], influence of the dielectric barrier discharge on their aerodynamic resistance [8], as well as reduction of noise level in flight [9].Impressive advances have been made in the field of reduction of aerodynamic resistance of streamlined bodies with an initiated near-surface discharge. The majority of studies were carried out at atmospheric pressure [8,9]; however, with increase in the flight altitude, the atmospheric pressure decreases, and at an altitude of 10,000 m it amounts to about 140 Torr depending on weather conditions. In flights with supersonic velocities, near the flying vehicle surface a region of over-pressure is formed that exceeds the atmospheric one. This has led to a necessity of investigating the influence of the barrier discharge plasma on the aerodynamic resistance in a wide range of pressures. Similar investigations were carried out in various gaseous media such as N 2 , O 2 , He, Ar, Ne, CO 2 , CH 4 , N 2 ⁄ He, N 2 ⁄ Ar, and N 2 ⁄ Ne in the pressure range 0.01-1 atm [10].The results of experimental investigations of the characteristics of the barrier discharge in air in the pressure range 0.2-1 atm are presented in [11,12]. The study of the dependence of the discharge-induced ion wind velocity on the surrounding air pressure carried out with the aid of a Pitot-Prandtl tube at a voltage of 12 and 15 kV and frequency of 1 kHz showed that the maximum value of velocity is attained at a pressure of 0.4 atm and the maximum value of the mass flux at a pressure of 0.6 atm. With further decrease in the pressure, the ion wind velocity decreases.To investigate the shape of the discharge and the dynamics of streamer operation, a photograph of the process with an exposure of 50 ns was made. The photographs obtained showed the linear dependence of the coefficient that determines the rate of the streamer branching length growth on pres...

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Shadow method for measuring the average electron density in an ionized gas flow induced by a high-frequency barrier discharge

Cited by 2 publications

References 20 publications

Shadow method for measuring the electron density in a barrier discharge plasma on the Zhukovskii airfoil surface

Shadow method for measuring the electron density in a barrier discharge plasma on the Zhukovskii airfoil surface

Characteristic features of a barrier discharge occurring on the zhukovskii aerofoil on variation of the surrounding air pressure

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