Bulg. J. Phys. vol.22 no.1-2 (1995), pp. 083-095



Quasi-One-Dimensional Calculations of Underexpanded, Supersonic Jets of Arc Heated Gas

B.E. Djakov
Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradslro Shose, Sofia 1784, Bulgaria
Abstract. The objective of this study is a supersonic jet formed by an arc plasma outflowing from a cylindrical sonic nozzle into a reservoir with back pressure of 102 to 103 Pa. For known conditions at the nozzle exit and known jet boundary, the plasma flow is calculated from the equations for steady one-dimensional flow of compressible fluid. The results are compared with experimental measurements (Luyanov 198I) on underexpanded argon jets produced by a conventional arc torch; the case of heat addition in the expanding jet, e.g. by an auxiliary arc, is also studied.

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