Methods for Panoramic Visualization and Digital Analysis of Thermophysical Flow Fields. A Review.

Znamenskaya, I. A.

doi:10.26583/sv.13.3.13

Cited by 20 publications

(10 citation statements)

References 89 publications

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“…Digital animations may match CFD calculations to validate the CFD code and improve its accuracy. Some examples one can find in review [20]. Here we presented example of temperature evolution from thermographic animations (IR radiation emission) obtained at 115 Hz to measure fluid temperature with a high frame rate in different image points using commercial software.…”

Section: Discussionmentioning

confidence: 99%

Animations Analysis in Experimental Fluid Dynamics

Znamenskaya¹,

Sysoev²,

Doroshchenko³

2021

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Section: Discussionmentioning

confidence: 99%

Animations Analysis in Experimental Fluid Dynamics

Znamenskaya¹,

Sysoev²,

Doroshchenko³

2021

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“…To correctly convert the detected radiation into radiation temperature values, it is necessary to determine the following parameters: the object emissivity, the surrounding objects ef-fective temperature, the atmosphere temperature, and the distance between the thermal imager and the object (to calculate the atmosphere transmission) [12,13].…”

Section: Thermal Radiation Non-stationary Fields Visualization During...mentioning

confidence: 99%

The Discharge Heated Channel Region Visualization based on Thermal Imaging Registration

Znamenskaya¹,

Karnozova²,

Kuli-Zade³

2022

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The paper presents the results of non-stationary thermal fields panoramic visualization, based on infrared thermography at the STDO-3 device (Shock Tube -Discharge -Optics) of the Lomonosov Moscow State University, Faculty of Physics. The main purpose of the work was to study the heating and cooling processes in a rectangular channel region under the influence of pulsed surface high-current discharges sliding over the dielectric surface, taking into account the supersonic flow in a channel with an obstacle. A pulsed surface discharge initiated in a 24x48 mm2 channel was studied in a quiescent air and in a high-speed flow behind the shock. When initiated in the flow (the delay time after the shock wave passage is up to 0.4 ms), the discharge plasma is localized mainly in the downwind region behind the reverse step (rectangular ledge). The discharge produces a pulsed (submicrosecond) contracted energy input with a 30 mm length in the localization zone. As a result, there is a short-term heating of the section of the channel wall adjacent to it. Using infrared (IR) thermographic imaging through the chamber quartz windows transparent to IR radiation, it was found that in the discharge chamber the discharge plasma noticeably heats the surface of the flat channel wall. Based on the obtained data of panoramic visualization with an exposure time up from 200 µs, we studied the channel walls cooling process both in quiescent air and in flow at different oncoming gas velocities -in the downwind region behind the dielectric ledge.

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“…The use of different types of discharges in supersonic airflows has been studied for the last decades and applied to plasma aerodynamics problems [1 -4] that includes the search for optimal discharge modes for active control of flows and shock waves. To visualize flows of transparent media and to obtain quantitative information about the flow classical panoramic methods researchers widely use such methods as direct shadowgraphy, schlieren technique, interferometry [4][5][6]. These methods are proved to be effective in shock tunnels and wind tunnels with trans-and supersonic flows, where the flow field includes regions with significant changes in density and refractive index of gas.…”

Section: Introductionmentioning

confidence: 99%

High-Speed Flow Visualization by a Nanosecond Volume Discharge during Shock Wave Diffraction on an Obstacle

Mursenkova,

Ivanova,

Ivanov

et al. 2023

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We study the spatial structure of nonstationary inhomogeneous supersonic airflows as shock wave diffraction on an obstacle occurs in a shock tube of a rectangular cross section. The Mach numbers of shock waves were 2.7–4.4 at initial air pressures of 10–30 Torr. The supersonic flow in the discharge chamber was visualized by high-speed shadowgraphy and by the registration of radiation of combined volume discharge by photo camera and by ICCD camera. In experiments, a combined volume discharge with a current duration of ~ 500 ns was initiated 40–150 μs after the initial shock wave have passed an obstacle. It has been established that the radiation of the volume phase of discharge lasts 400–700 ns, and the displacement of the flow during this time does not exceed 0.6 mm. A correlation is established between the spatial distribution of discharge radiation and the low-density local areas determined as a result of two-dimensional Navier-Stokes based numerical simulation of the flow. As visualized by the glow of the discharge, the shape of the shock wave front is in good agreement with the results of shadowgraphy at different stages of diffraction and with the numerical simulation results.

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Methods for Panoramic Visualization and Digital Analysis of Thermophysical Flow Fields. A Review.

Cited by 20 publications

References 89 publications

Animations Analysis in Experimental Fluid Dynamics

Animations Analysis in Experimental Fluid Dynamics

The Discharge Heated Channel Region Visualization based on Thermal Imaging Registration

High-Speed Flow Visualization by a Nanosecond Volume Discharge during Shock Wave Diffraction on an Obstacle

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