A. S. Baryshnikov

Rearrangement of the shock wave structure in a decaying discharge plasma

A study has been made of the change in the structure of a shock wave in a decaying discharge plasma with Mach numbers between 1.2 and 2. A novel method is proposed to investigate the rearrangement of the shock wave structure under transient conditions. The times of the main processes responsible for this effect are determined.

Peculiarities of interaction of a shock wave with gas discharge plasma

Using a double electrical probe, distribution of charged particles behind the front of a shock wave in gas discharge plasma in the presence of the electric field and in decaying plasma without the electric field was studied. A significant difference between the distributions of the charged particles in these two cases was revealed.

The effect of humid and dusty atmosphere on shock wave destruction in a glow-discharge plasma

The influence of air humidity and the dust present in air and nitrogen on the structure of a pressure momentum distribution behind a shock wave propagating across the positive column of glow discharge in these gases has been experimentally studied. Analysis of the experimental data provides information concerning the mechanism of shock wave degradation under such conditions.

Interaction of shock wave with free glow discharge

The distribution of charge particles in glow-discharge plasma during shock wave propagation through it is measured by a double electric probe. It is established that a decrease in the ion concentration in front of the shock wave is related to the occurrence of ion-acoustic oscillations in the plasma.

An experimental study of the effect of humidity on the distribution of charged particles in a glow-discharge plasma

The charged-particle distribution in a glow-discharge plasma in air with differing moisture concentration was studied using a double electric probe. An important difference is found in the distribution of charged particles in the discharge, depending on the humidity of the air. The amount of water vapor with a relative concentration of 2% does not affect the distribution of charged particles in the plasma, and, with an increase in moisture content up to 15%, a twofold increase in the ion concentration along the discharge axis is observed.

Comparison of propagation of a shock wave in a decaying plasma in various gases

The effect of gas humidity and composition on shock wave splitting in the plasma of a decaying glow discharge is investigated in dried and moist air, nitrogen, and argon over various time periods after the discharge termination. The shapes of the signals reflecting the gas pressure distribution behind the shock wave in these media are approximately the same except for some values of decay time comparable to the characteristic time of decay of excited state concentration (including singlet oxygen) after the termination of the discharge (8 ms). The signals in the same four gases are compared quantitatively for different time periods after discharge termination by expanding the signal into a Fourier series. The free term and the second and third modes in the Fourier expansion are compared. Analysis is carried out for up to time periods of 60 ms.

Shock wave propagation in glow-discharge plasma in dry and humid air

We have experimentally studied propagation shock waves in glow-discharge plasma in dry and humid air. It is established that the structure of a pressure pulse behind a shock wave propagating across the positive column of glow discharge in both cases generally remains the same. At the same time, the wave velocity profile across the column exhibits a change in positions of the velocity peaks.

Charged Particle Distribution near the Shock Front in a Glow Discharge

The charged particle distribution near the front of a shock wave propagating in the glow discharge plasma has been investigated. It has been found that the ion concentration before the front varies nonmonotonically. Behind the shock front, the charged particle concentration varies smoothly in contrast to the neutral component density.

An experimental investigation of interaction between projectiles and flames

This investigation is devoted to the influence of a heated area of gas on model stability with the supersonic motion during free-flying operation. The conditions of the maximum influence on aerodynamics of body flight in an inhomogeneous heated area are ascertained.

The Sound Velocity Profile and the Effect of Weak Shock Wave Destruction in the Positive Column of Transverse Glow Discharge

The sound velocity profile in the direction across the positive column of glow discharge in air has been experimentally measured and theoretically calculated. The sound velocity exhibits a sharp local increase, which coincides in the experimental and theoretical profiles.