A Nanosecond High-Current Discharge in a Supersonic Gas Flow

Znamenskaya, I. A.; Koroteev, Dmitry; Попов, Н. А.

doi:10.1007/s10740-005-0129-x

Cited by 9 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Shadowgraph images (light refraction) captured by high-speed camera at 124 000 frames/s Supersonic gas flow structure can be visualized by the electrical discharge [5]. Discharge plasma in gas volume follows shapes of discontinuities, inhomogeneities, streamlines because discharge electric current strongly depends on the E/N ratio [5,6]. Fig.…”

Section: High-speed Shadowgraph Imagingmentioning

confidence: 99%

Animations Analysis in Experimental Fluid Dynamics

Znamenskaya¹,

Sysoev²,

Doroshchenko³

2021

View full text Add to dashboard Cite

Section: High-speed Shadowgraph Imagingmentioning

confidence: 99%

Animations Analysis in Experimental Fluid Dynamics

Znamenskaya¹,

Sysoev²,

Doroshchenko³

2021

View full text Add to dashboard Cite

“…Supersonic gas flow structure may be visualized by the electrical discharge [5]. Discharge plasma in gas volume follows shapes of discontinuities, inhomogeneities, streamlines because discharge electric current strongly depends on the E/N ratio [5,6]. Figure 5 presents 9 frames of discharge glow zone: ionization upon interaction of a shock wave with a pulse volume discharge in the nanosecond range.…”

Section: High-speed Shadowgraph Imagingmentioning

confidence: 99%

Experimental Digital Animation in Fluid Dynamics

Znamenskaya

Sysoev

Doroshchenko

2021

Proceedings of the 31th International Conference on Computer Graphics and Vision. Volume 2

View full text Add to dashboard Cite

Digital imaging became one of the main tools for studying unsteady flows. Modern high-speed cameras support video recording at high frame rates which makes it possible to study extended high-speed processes. We demonstrate here different animations: water temperature field evolution with a frame rate of 115 Hz; high-speed shadowgraph visualisation of different flows - water jet formation process (100 000 frames / s), shadowgraph animations of the shock waves created by the pulsed discharges (124 000 frames / s). Also, as an example of plasma flow visualization technique, we offer 9 sequential images of the shock wave - pulse gas discharge visualization obtained by the high-speed CCD camera with the 100 ns delay between frames. We developed in-house software based on the machine vision and learning techniques for automatic flow animations processing. The examples of the automatic oblique shock detection using Canny edge detection and Hough transform and thermal plume detection based on the pre-trained convolutional neural network are provided and discussed.

show abstract

“…It was shown 10,13,14 that about 20%-50% of the high current nanosecond discharge's energy is directly converted to the gas heating. The vibrational-translational relaxation time for the other part of the discharge's energy is quite long ͑more than 10 −4 s͒, so under the conditions of the described experimental setup, we may consider only the instant part of the energy release.…”

Section: Discharge As a Source Of Instant Gas Heatingmentioning

confidence: 99%

Discontinuity breakdown on shock wave interaction with nanosecond discharge

2008

Self Cite

View full text Add to dashboard Cite

Discontinuity breakdown conditions were experimentally realized by instant energy input in front of a plane shock wave. A shock tube and a special type of transversal nanosecond electric discharge with plasma electrodes were used for this research. A two-dimensional ͑2D͒ numerical simulation under experimental conditions has been undertaken. The pressure, density, temperature, and velocity fields have been examined. A comparison of numerical data and shadow images of a 2D flow after shock wave interaction with the discharge area was conducted. The geometry of the disturbed flowfield was found to be in good correspondence with one from numerical calculations. The results of the investigation also showed that, by using the described experimental setup, it is possible to achieve a special type of Richtmyer-Meshkov instability without applying an additional curved diaphragm.

show abstract

A Nanosecond High-Current Discharge in a Supersonic Gas Flow

Cited by 9 publications

References 6 publications

Animations Analysis in Experimental Fluid Dynamics

Animations Analysis in Experimental Fluid Dynamics

Experimental Digital Animation in Fluid Dynamics

Discontinuity breakdown on shock wave interaction with nanosecond discharge

Contact Info

Product

Resources

About