The dielectric breakdown model is generalized and adapted to describe electric discharge propagation in inhomogeneous insulators. The influences of the injected space charge, inclusions and barriers with different dielectric permittivities and conductivities are investigated. The growth of bush, dendrite and skeleton types of discharge structure as well as transformations from one type to another are simulated.
The optic observation results of the impulse discharge propagation in the deionized water 2-8 cm gaps formed by point and plane electrodes are described. The formation of weekly conducting and weekly luminous but scattering laser beam matter at the point always preceded the positive discharge channels development. The matter nature isn't identified. Continuos and discrete forms of the discharge channels propagation and transition from one to another are founded. Flashes of the discrete propagating main channels were stipulated by the thin lower conductivity channels growth, which form a bush(brush)-like structure. The diameters
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