Tatiana Lapushkina

SUPERSONIC BODY STREAMLINE AT DIFFERENT CONFIGURATION GAS DISCHARGE

A possibility to control the shock wave configuration by plasma, electrogasdynamic (EGD) and magnetohydrodynamic (MHD) methods is reported. In particular, the effects of gas discharges with different configurations on the position of a bow shock wave arising due to supersonic streamlining of a semicylindrical body by ionized xenon flow are considered. In the plasma control method a discharge creates a strongly nonequilibrium plasma in the flow before the body. It has been shown in our experiments that a change in the bow shockwave position depends on the degree of plasma nonequilibrity. In the EGD and MHD methods, a discharge was organized in the near surface area of the nose part of the body. In these cases the changes in the bow shock wave positions were achieved by changing the discharge intensity (EGD method) or by applying an external magnetic field (MHD method). Preliminary results of the similar experiments in body streamline by an air flow are also presented.

Flow Around Different Bodies at the Pellet or Plasma Jet Injection

In this work the possibility of bodys aerodynamic drag reduction by action on the flow around body is considered. The aim of this work is the experimental study of the influence of injection of mm-size bodies (pellets) or plasma jets towards the flow on characteristics of supersonic flow around model. It is shown the possibility to use the railgun as a generator of high-speed plasma flow with chosen chemical composition.

INFLUENCE OF MAGNETIC FIELD ON GAS DISCHARGE USED FOR AIR IONIIZATION

The aim of this work is investigations of external magnetic field influence on shape and structure of high-voltage gas discharge used for air flow ionization for ionization degree up to 10 -5 . Experimental setup was made on the base of one-diaphragm shock tube and includes: divergent MHD channel with system of electrodes, system of magnetic field generation, and system of organization of ionizing high-voltage discharges with duration of 2-4 mks. In first series of experiments discharge current flew along magnetic lines and in second series the direction of the discharge current was transverse to the magnetic field. The luminocity of the discharge at different values of magnetic field was obtained. As the result we can conclude that the most effective is to use pulse-periodic discharge in transverse direction using the electrodes for magneto-induced current.

Gas Discharge in Longitudinal and Transverse Magnetic Field

Investigations of the influence of external magnetic field on the shape and structure of the high-voltage gas discharge used for air flow ionization to an ionization degree of up to 10-5 are presented. In the first series of experiments, the discharge current flew along magnetic field lines; and in the second series, the discharge current was transverse to the magnetic field. The discharge shape and structure at different magnetic field intensities were obtained.

PLASMA FLOW FROM ELECTROMAGNETIC RAIL ACCELERATOR CHANNELS

In the work the generation of high-speed flows of d ense carbon plasma by the electromagnetic rail accelerators (railguns) is stu died. It is investigated of the streamline peculiarities by such flows of the unsymmetrical we dge shape bodies. It is shown that under condition of flow of dense cluster carbon plasma fr om the railgun channel a ratio of specific

MHD FLOW CONTROL IN INERT GAS PLASMA AND AIR PLASMA

This paper is a review of the investigations carried out on the Small Shock Tube at the Ioffe Physico-Technical Institute during 2001 – 2007 years. These investigations were devoted to searching for ways and means of affecting a supersonic flow of a weakly ionized gas by an electromagnetic impact aimed at the magnetohydrodynamic (MHD) control of gas flows. In the course of the experimental investigations the authors were studying magnetohydrodynamic processes in supersonic xenon and air. The results obtained evidence possibilities of an effective control of the shock wave structure of supersonic gas flows by MHD method.