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High values o f pressure and temperature can be achieved under electric discharges in liquids. I t explains the interest in their widespread application both in physical experiments on pulsed power and industry. Wide-range quantitative information on these phenomena was analyzed and systematized at the IPRE due to theoretical and experimental investigations carried out during last years. The aim of this paper is to estimate some investigation results obtained at the IPRE as well as the achievements in pulsed power industrial application. LTRENDS OF THE RESEARCH WORK ON UNDERWATER ELECTRIC DISCHARGESDuring last twenty years research work at the IPRE was conducted in three main directions:Creation o f pulsed power systems and components. Investigation o f material and construction behavior under various modes of pulse loading. Plasma and pulse power diagnostics, MHD simulation, and high energy density hydrodynamics. On this base a wide fi el d o f applications including more than two hundred technologies was analyzed. Proper inarket surveys and technology evaluations led to selecting the most advanced ones briefly considered in this paper. The known methods for quantitative description of electric discharges in liquids can be conditionally divided into two large groups. The models o f the first group suppose the uniformity o f plasma characteristics across the discharge channel, and motion o f the surrounding medium i s considered in the bounds o f ID-2D hydrodynamics [I]. At that, the average values of plasma characteristics (particle concentration, temperature, and pressure) as well as the surrounding medium pressure and velocity space-time distributions are calculated with the use of the discharge circuit parameters. Originally the models o f this group were one-dimensional. Experimentally determined temporal dependencies of the power delivered to plasma were used in them. Later, closed models were used [I, 21. They included equations of state for non-ideal plasma, took into account radiant losses and transient phenomena in the discharge circuit [;I. Under conditions of plasma interaction with shock waves and intensive radiant heat transfer, that is, when the knowledge on space-time distribution of plasma characteristics across the plasma channel i s o f importance, it is necessary to consider the all region o f the gap spacing. It includes the plasma channel and surrounding medium as continuum taking into account interaction between electrical, hydrodynamic and thermodynamic phenomena by applying MHD approach for underwater discharge [4]. The data obtained were used in design practice pertaining to a number o f pulsed power applications utilizing underwater electric discharge. ILPULSED POWER SYSTEMS AND COMPONENTS Creation o f pulsed power sources and their components at the IPRE included elaboration o f high-voltage pulse capacitors, switches, charging devices and power conditioning elements sufficient for application in the industrial environment. Considerable improvement of their characteristics are attained...

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