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Modelling of a supersonic ICP argon–hydrogen expansion

An expanding argon–hydrogen plasma is investigated by means of simulations. The model is a hydrodynamical model specific for plasma expansions, taking into account the conservation laws of mass, momentum and energy. The code includes the Rankine–Hugoniot relations to calculate shock jump conditions. Results are shown for the expansion from an inductively coupled plasma (ICP) with a separated Laval nozzle. The expansion discussed here is a `weakly' under-expanding argon–hydrogen plasma. The results from the ICP expansion are verified with probe measurements.