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Outline

Study of an Underexpanded Plasma Jet

1987, Beiträge aus der Plasmaphysik

https://doi.org/10.1002/CTPP.19870270309

Abstract

Supersonic jets (Mach number M = 1.4-2.0) of dense plasma were produced by a plasmatron in a pulsed regime. The shock structure was investigated by fast mirror cameras, by the schlieren technique and by probe and spectroscopic methods. It was found that during jet expansion the bow shock ahead the gas-plasma interface and the shock behind i t are superimposed with the quasistationary shock structure which includes the Mach disk. Whereas the plasma in the discharge chamber is in LTE (n, w 5 x loz3 m-3, T w 14000 K), the electron density of the expanding jet plasma falls to a plateau value of n, w 5 x lo1$ m4 below the LTE limit. At this phase, the jet plasma formed a ball-like turbulent plasmoid which moves a t a subsonic velocity through the air up to some milliseconds.

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