The study on the local compression effect on the nozzle arc

An investigation of the local compression effect on the forced elongated arc in a ring constrictor nozzle (R-nozzle), an injection constrictor nozzle (P-nozzle), and a magnetic compression nozzle (H-nozzle) is presented. The voltage of the R-nozzle is higher than that of the insulated constrictor nozzle with the same constrictor length (C-nozzle), and the net arc input power of R-nozzle is 1.2 times that of C-nozzle. The voltage of the insulated constrictor nozzle whose constrictor length is lengthened by 6 mm is equal to R-nozzle. When the ratio of the injection gas flow rate to the base gas flow rate is over 1.0 at total gas flow of 20 l/min, the voltage of P-nozzle is higher than that of C-nozzle. Finally, when the axial magnetic field 420 G is applied to the forced elongated arc in the H-nozzle, the electric field strength of the arc column increases by 20%.