Studies of Anomalous Shock Wave Propagation and Dispersion in Weakly Ionized Plasma

摘要

The effects of weak ionization on the strength of shock waves in supersonic gas flows were studied in an experimental program. Claims that weak ionization can substantially reduce shock wave strength, independently of any plasma heating effects, were evaluated. Experiments were conducted in both shock tubes and in supersonic, steady flow, plasma wind- tunnels. Temperatures and ionization levels in the flows were measured. It was demonstrated that shocks can be weakened by creating an electric discharge in the flow, but this effect is purely a consequence of the Joule heating of the plasma. Without heating, ionization alone does not weaken the shock.