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Neglecting magnetic and electric forces which occure in the expansion of a plasma in a LAVAL nozzle the plasma parameters are calculated by means of a simplified model  3  under the condition of isentropic flow. An Ein-Stufen-Modell and a Zwei-Stufen-Modell  1  is applied. It proves that the experimental results at hand can only be explained by means of the Zwei-Stufen-Modell. The calculations include the case of thermodynamic equilibrium as well as that of frozen flow.

Berechnungen zur isentropen Entspannung eines Argon-Plasmas in einer Laval-Düse