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The cyclicity effect of the electrical energy input on the hydrodynamic characteristics of the plasma channel and its radius, expansion velocity, and specific pressure force pulse is investigated for oscillating modes of the underwater spark discharge. A methodology of numerically determining the hydrodynamic characteristics for electrohydropulse processing facilities employing the power of an electric discharge in oscillating modes is recommended.

The results of numerical experiments pertaining to the influence of high-voltage discharges in liquid on the discharge hydrodynamics are presented. It is shown that, with a fixed power source, parameters of the oscillating discharge modes have to be used to obtain higher values of the discharge channel broadening velocity, pressure, and specific momentum; critical modes must be chosen for prolonged intervals of increased pressure influence and higher values of the specific pulse pressure in the liquid.