The field of supersonic flow control by external energy deposition is discussed in this article. The goal of this research is to look at how ionisation inhomogeneities organised in the vicinity of a shock wave's propagation affect its shape, stability, and intensity. The experimental and numerical study of passing a powerful shock wave (M=5-6) across the region of pre-formed ionisation instability in gas discharge plasma. Ionization spherical strata forming in the gas discharge zone due to the development of ionisation instability in air were obtained in the experiments. The generation of new sophisticated shock-wave topologies was obtained as a result of the contact of an originally plane shock wave with the inhomogeneous plasma region, the shape of which changed from smooth to gear. These arrangements were demonstrated to take on an unsteady personality. Numerical simulations were carried out using sophisticated conservative difference methods on the basis of the Euler system of equations with parameters appropriate to the experimental conditions. A collection of thermal layers with varied properties were used to mimic the stratified energy source. Variations in the adiabatic index were used to explain changes in the medium's physic-chemical properties. The interaction of the shock wave with the zone of ionisation instability resulted in stratified shock-wave structures consisting of modified wavy shock-wave and contact discontinuities. The Richtmyer-Meshkov instabilities were generated on the thermal stratum in the area of the shock wave front curvatures, confirming the shock wave front's unstable nature. The experimental and numerical shock front evolutions were found to be in good agreement. The study's findings can be applied to high-speed flows, shock-wave setups, and mixing processes.
Author (S) Details
Olga Azarova
Department of Mathematical Modeling of Computer-Aided Design Systems Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences Vavilova st. 40, 119333, Moscow, Russia.
Tatiana Lapushkina
Laboratory of Physical Gas Dynamics, Ioffe Institute, Politekhnicheskaya str. 26, 194021, St Petersburg, Russia.
Alexander Erofeev
Laboratory of Physical Gas Dynamics, Ioffe Institute, Politekhnicheskaya str. 26, 194021, St Petersburg, Russia.
Oleg Kravchenko
Department of Mathematical Modeling of Computer-Aided Design Systems Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences Vavilova st. 40, 119333, Moscow, Russia.
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