Measurement of the electron concentration in the vicinity of a strong shock wave

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Abstract

A series of probe measurements to determine the electron concentration in a gas ahead of a strong shock wave front was carried out using a double-diaphragm shock tube DDST-M of the Institute of Mechanics, Moscow State University. At the same time, the light flux from the region of the shock-heated gas was recorded, which made it possible to calculate the electron concentration behind the shock wave using the spectroscopic method. The experiments were carried out in air, oxygen, and nitrogen at shock wave velocities from 8.3 to 11.3 km/s and an initial pressure of 0.25 Torr in the low-pressure chamber. The dependences of the electron concentration on the shock wave velocity and the distance from the observation point to the shock wave are obtained. Spectroscopic measurements made it possible to determine the dependence of the electron concentration on the composition of the gaseous medium. The obtained data are compared with the experimental data of other authors.

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About the authors

P. V. Kozlov

Institute of Mechanics, Lomonosov Moscow State University

Email: vyl69@mail.ru
Russian Federation, Moscow

G. Ya. Gerasimov

Institute of Mechanics, Lomonosov Moscow State University

Email: vyl69@mail.ru
Russian Federation, Moscow

V. Yu. Levashov

Institute of Mechanics, Lomonosov Moscow State University

Author for correspondence.
Email: vyl69@mail.ru
Russian Federation, Moscow

N. G. Bykova

Institute of Mechanics, Lomonosov Moscow State University

Email: vyl69@mail.ru
Russian Federation, Moscow

I. E. Zabelinsky

Institute of Mechanics, Lomonosov Moscow State University

Email: vyl69@mail.ru
Russian Federation, Moscow

M. A. Kotov

Ishlinsky Institute for Problems in Mechanics, RAS

Email: vyl69@mail.ru
Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. Evolution of the voltage on the probe Z in front of the shock wave moving in the air with a speed of VSW = 10.4 km/s at p₀ = 0.25 Torr. The inset shows the interaction diagram of the shock wave with the probe.

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3. Fig. 2. Dependence of the electron temperature Tₑ on the distance to the shock wave in air at p₀ = 0.25 Torr and VSW = 9.2 (1), 10.7 (2), 11.5 (3) and 12.3 km/s (4).

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4. Fig. 3. Comparison of the calculated electron temperature Tₑ before the shock wave in air at p₀ = 0.25 Torr and VSW = 11.5 (1) and 12.3 km/s (2) with the measurement data from [18] at p₀ = 0.23 Torr and VSW = 12.3 km/s (dots).

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5. Fig. 4. Measured concentrations nₑ in front of a shock wave propagating through the air at p₀ = 0.25 Torr and VSW = 10.4 km/s (1) and their comparison with microwave measurement data from [24] at p₀ = 0.2 Torr and VSW = 9.8 (2) and 10.8 km/s (3).

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6. Fig. 5. Measured concentrations nₑ in front of a shock wave propagating through the air at p₀ = 0.25 Torr and VSW = 10.4 km/s (1) and their comparison with the data of measurements by a triple probe from [25] at p₀ = 0.2 Torr and VSW = 9.5 (2) and 11.3 km/s (3).

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7. Fig. 6. Time-integrated intensities of the Hᵦ line emission in oxygen (1) and nitrogen (2) at p₀ = 0.25 Torr and VSW = 10 km/s.

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8. Fig. 7. Electron concentrations nₑ measured using the spectroscopic method in shock-heated air (1), oxygen (2) and nitrogen (3), as well as data from work [14] for air (4). The line is the results of the equilibrium calculation [14].

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