| Discharged capillary have been used in high speed launch technique such as electrothermal (ET) and electrothermal chemical (ETC) plasma devices. It is the key component in the electrothermal chemical guns. The efficiency of electricity-thermal conversion is based on the matching between plasma resistance in Discharge capillary and PFN in electrothermal chemical guns. This paper contains the plasma conductivity under unsymmetrical condition, and also includes electromagnetic field distribution and electromagnetic characteristics around plasma series-injectors.This paper researches the plasma conductivity generated by high-power pulse discharge, which contains analyse, calculation and electromagnetic character in plasma series-injectors which discharge on the out side. Firstly, the equation of plasma conductivity is educed by the method of simple aerodynamics, then accurate calculation mode is putted out, and a practical mode is applied on plasma which generated by high-power pulse discharge. A two-dimension model is developed from governing Maxwell equations for investigating electrical conduction in plasma series-injectors. Calculations are undertaken to determine the impedance in such a series-injectors depending on as a function of several relevant various parameters. It is shown that current flow mainly by low-resistance path provide by solid when the length is far longer than the width, while current flow mainly by plasma when the width is far wider than the length. |
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