Gas-Vapor Cavity Effect on Pressure Field in Deformable Wall Closed Discharge Chamber

The pressure field in the limited volume discharge chambers with deformable walls markedly affects the technological process efficiency of sheet alloys’ deformation; therefore, its determination is of great importance. Resulting from the electrical discharge in liquid, which fills the discharge chamber, a cavity is formed in the latter with a higher compressibility than that of the liquid in the chamber. Its pulsations create the field of pressure in the discharge chamber. At present, the role of the gas-vapor cavity is studied slightly as to the formation of the field of pressure in the discharge chamber with a deformable wall. Its definition is the aim of this work. The research is based on the earlier developed mathematical model of the electric discharge in water, which is supplemented in this work with correlations that significantly enhance the calculation precision of the discharge channel resistance and the energy released in it. It was determined that the pulsations of the gas-vapor cavity ensure pressure oscillations in it in a counter-phase with an average pressure in the liquid. They decay slowly in the discharge chamber with rigid walls, whereas the presence of the deformable wall makes the decay of the pressure oscillation to be rapid. In the mathematical model developed earlier, a change in the plasma optical transparency and its substantial effect on the pressure in the cavity as well as the pressure field in the liquid were taken into account.