Shock wave propagation and dispersion in glow discharge plasmas

Macheret, Sergey; Ionikh, Yu. Z.; Chernysheva, Naira V.; Yalin, Azer P.; Martinelli, Luigi; Miles, Richard B.

doi:10.1063/1.1388204

Cited by 64 publications

(35 citation statements)

References 7 publications

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“…7(b). Both the velocity and width data indicate that the igniting plasma quickly reaches a stead-state condition at a higher temperature (T g > 300 K) after a delay ~ 100 ms, which is consistent with the earlier measurements by Macheret et al 5 A similar trend has also been observed at other fixed pressures and plasma currents.…”

Section: B Pulsed Plasma Measurementssupporting

confidence: 81%

“…[1][2][3] Another group of researches showed by combined experiments and simulations that the thermal non-uniformity and temperature variation in the discharge tube have been the primary cause of the shock wave modification in plasmas. [4][5][6][7][8] They have isolated the thermal effects from all other mechanisms in the plasma by pulsing the discharge on a short time interval.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of Shock Wave Dynamics in Magnetized Plasmas

Podder¹

2009

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In this four-year project (including one-year extension), the project director and his research team built a shock-wave−plasma apparatus to study shock wave dynamics in glow discharge plasmas in nitrogen and argon at medium pressure (1-20 Torr), carried out various plasma and shock diagnostics and measurements that lead to significant progress in understanding shock wave acceleration phenomena in plasmas. Specifically, the team has• completed the construction of spark-discharge shock tube in the first year;• optimized the shock tube over low Mack numbers (Mach 1-4);• built a microwave target plasma and optimized the steady-state plasma condition;• carried out various probe and spectroscopic diagnostics for the dc glow plasma;• launched acoustic shock waves in three different plasma conditions: (i) steady-state, (ii) pulsed or transient, (iii) afterglow plasma;• studied turbulence and the shock wave behaviors in the glow discharge plasmas;• performed a comprehensive set of measurements and computations to increase our understanding of shock-plasma correlation behaviors and improve our understanding of shock acceleration mechanisms in discharge plasmas.The measurements clearly show that in the steady-state dc glow discharge plasma, at fixed gas pressure the shock wave velocity increases, its amplitude decreases, and the shock wave disperses non-linearly as a function of the plasma current. In the pulsed discharge plasma, at fixed gas pressure the shock wave dispersion width and velocity increase as a function of the delay between the switch-on of the plasma and shock-launch. In the afterglow plasma, at fixed gas pressure the shock wave dispersion width and velocity decrease as a function of the delay between the plasma switch-off and shock-launch. These changes are found to be opposite and reversing towards the room temperature value which is the initial condition for plasma ignition case. The observed shock wave properties in both igniting and afterglow plasmas correlate well with the inferred temperature changes in the two plasmas.

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Section: B Pulsed Plasma Measurementssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Experimental Study of Shock Wave Dynamics in Magnetized Plasmas

Podder¹

2009

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“…и структуру с плавным нарастанием плотности за ударным скачком. Подробно эти типы ударных волн исследованы в работах [5][6][7][10][11][12]. Хорошо видно расщепление фронта удар-ной волны на входе в область неравновесности (при x ′ > 0) с образованием тепловой волны охлаждения на границе области.…”

Section: а бunclassified

“…Как показано в [5][6][7], в средах со стационарно поддерживаемой неравновесно-стью изменение структуры слабой ударной волны может быть вызвано существенно новыми акустическими свойствами подобных сред, обусловленными знакоперемен-ностью коэффициентов второй вязкости, дисперсии и газодинамической нелинейно-Дмитрий Игоревич Завершинский, аспирант, каф. физики.…”

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Взаимодействие Ударных Волн С Областью Неравновесности В Колебательно-Возбужденном Газе

Zavershinskii¹,

Zavershinsky²,

Макарян³

et al. 2012

Вестн. Сам. гос. техн. ун-та. Сер. Физ.-мат. науки

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“…[11][12][13][14] Specifically, in high-speed flows, several experimental studies have demonstrated the influence of the plasma on shock wave. [15][16][17][18] Many of these investigations have been performed with shock waves, generated by an electrically pulsed discharge, propagating along the low-pressure-unconstricted dc glow discharge. It has been observed that the creation of a double layer and associated gas heating caused by the propagating shock wave can increase the shock velocity and broaden its width.…”

Section: Introductionmentioning

confidence: 99%

Influence of shock wave propagation on dielectric barrier discharge plasma actuator performance

Erfani¹,

Zare‐Behtash²,

Kontis³

2012

J. Phys. D: Appl. Phys.

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Erfani, R., Zare-Behtash, H., and Kontis, K. (2012 AbstractInterest in plasma actuators as active flow control devices is growing rapidly due to their lack of mechanical parts, light weight, and high response frequency. Although the flow induced by these actuators has received much attention, the effect that the external flow has on the performance of the actuator itself must also be considered, specially the influence of unsteady high-speed flows which are fast becoming a norm in the operating flight envelopes. The primary objective of the current study is to examine the characteristics of a dielectric barrier discharge (DBD) plasma actuator when exposed to an unsteady flow generated by a shock tube. This type of flow, which is often used in different studies, contains a range of flow regimes from sudden pressure and density changes to relatively uniform high-speed flow regions. A small circular shock tube is employed along with the schlieren photography technique to visualise the flow. The voltage and current traces of the plasma actuator are monitored throughout, and using the well established shock tube theory the change in the actuator characteristics are related to the physical processes which occur inside the shock tube. The results show that not only is the shear layer outside of the shock tube affected by the plasma but the passage of the shock front and high-speed flow behind it also greatly influences the properties of the plasma.

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Shock wave propagation and dispersion in glow discharge plasmas

Cited by 64 publications

References 7 publications

Experimental Study of Shock Wave Dynamics in Magnetized Plasmas

Experimental Study of Shock Wave Dynamics in Magnetized Plasmas

Взаимодействие Ударных Волн С Областью Неравновесности В Колебательно-Возбужденном Газе

Influence of shock wave propagation on dielectric barrier discharge plasma actuator performance

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