Passage of a Plane Shock Wave through the Region of a Glow Gas Discharge
- Authors: Lapushkina T.A.1, Erofeev A.V.1, Azarova O.A.2, Kravchenko O.V.3
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Affiliations:
- Ioffe Institute
- Dorodnitsyn Computing Center, Federal Research Center “Computer Science and Control,” Russian Academy of Sciences
- Scientific and Technological Center of Unique Instrumentation, Russian Academy of Sciences
- Issue: Vol 64, No 1 (2019)
- Pages: 34-41
- Section: Gases and Liquids
- URL: https://journals.rcsi.science/1063-7842/article/view/202626
- DOI: https://doi.org/10.1134/S1063784219010201
- ID: 202626
Cite item
Abstract
The interaction of a plane shock wave (M = 5) with an ionized plasma region formed before the arrival of a shock wave by a low-current glow gas discharge is considered experimentally and numerically. In the experiment, schlieren images of a moving shock-wave structure resulting from the interaction and consisting of two discontinuities, convex in the direction of motion of the initial wave, are obtained. The propagation of a shock wave over the region of energetic impact is simulated on the basis of the two-dimensional Riemann problem of decay of an arbitrary discontinuity with allowance for the influence of horizontal walls. The systems of Euler and Navier–Stokes equations are solved numerically. The non-equilibrium of the processes in the gas-discharge region was simulated by an effective adiabatic index γ. Based on the calculations performed for equilibrium air (γ = 1.4) and for an ionized nonequilibrium gas medium (γ = 1.2), it is shown that the experimentally observed discontinuities can be interpreted as elements of the solution of the two-dimensional problem of decay of a discontinuity: a shock wave followed by a contact discontinuity. It is shown that a variation in γ affects the shape of the fronts and velocities of the discontinuities obtained. Good agreement is obtained between the experimental and calculated images of density and velocities of the discontinuities at a residual gas temperature in the gas discharge region of 373 K.
About the authors
T. A. Lapushkina
Ioffe Institute
Author for correspondence.
Email: tanyusha@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021
A. V. Erofeev
Ioffe Institute
Email: tanyusha@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021
O. A. Azarova
Dorodnitsyn Computing Center, Federal Research Center “Computer Science and Control,”Russian Academy of Sciences
Email: tanyusha@mail.ioffe.ru
Russian Federation, Moscow, 119333
O. V. Kravchenko
Scientific and Technological Center of Unique Instrumentation, Russian Academy of Sciences
Email: tanyusha@mail.ioffe.ru
Russian Federation, Moscow, 117342