The paper presents a comparative study of a spark discharge evolution in nitrogen for cases of its isothermal and adiabatic compressions. A numerical model of a spark channel expansion which was previously tested in a wide range of spark discharge energies was used for this purpose. The model takes into account electric circuit parameters, gas-dynamic expansion processes, thermal gas ionization, non-equilibrium chemical reactions, electron heat transfer and radiation. The initial pressure of adiabatically and isothermally compressed discharge gas was varied in a range from 1 to 20 atm. A capacitor with capacitances of 0.1 and 0.01 μF and a circuit inductance of 2 μH were applied in the calculation. The charge voltage was 30 kV. An influence of initial gas pressure on energy deposited by spark discharge, the efficiency of spark energy deposition, the parameters of the shock wave generated by the spark discharge, the efficiency of the discharge-to-radiation energy conversion and the resistance of the spark channel were finally evaluated. A correlation coefficient was introduced to reflect the initial pressure influence on the energy deposition. The coefficient can be used to imitate an equivalent spark load for any initial pressure.

The article deals with the basic principles of control systems construction in the medical ozone generators. The authors present and analyzes the specific diagram of the electrical and pneumatic part of ozonator. According to analysis results the authors give recommendations for the considered systems realization in the medical ozone generators.

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