A. M. Orishich

Adjoint problems of mechanics of continuous media in gas‐laser cutting of metals

A mathematical model of gas‐laser cutting of metal plates in an inert gas is proposed. The formation and flow of the liquid metal melt film at the cutting front is considered within the framework of incompressible boundary‐layer equations. Based on the resultant analytical solution, a local law of energy conservation on the cutting surface is derived, which takes into account the melt‐film thickness and the temperature dependence of thermophysical parameters of the metal. The problem of the cutting shape and depth is solved in the two‐dimensional formulation. A comparison with experimental data is made in terms of the cutting depth and maximum cutting velocity for carbon and alloy steel.

EXPERIMENTAL STUDY OF AN MHD SOURCE OF LIGHT WITH A TC LAYER

The possibility of using a high-temperature current layer initiated in a plasma flow as a powerful source of light with a wide range of emission is demonstrated. The study was performed on a setup with a disk MHD channel in the regime of TC layer generation in argon and sodium plasma flows.

Investigation of the energy characteristics of a plasma created in air near a target by CO2 laser radiation

In this paper the authors investigate a method for determining the energy absorbed by a laser plasma based on measuring the parameters of the shock wave arising in the cold gas surrounding the target. The energy characteristics of the plasma are obtained near the threshold of its formation as a function of the target material and the intensity of the laser radiation.