To analyze the influence of injection pressure on the expansion characteristics of pulsed plasma jet, a two-dimensional axisymmetric unsteady model for pulsed plasma jet expansion in air is established, and the numerical simulation of this process is carried out. The evolution characteristics of two-phase interface and the variation of flow field parameters of pulsed plasma jet in air are studied in the range of 1.5~ 3.5 MPa jet pressure, then compared with the experiments. Results show that the simulation values of axial expansion displacement of pulsed plasma jet are in good agreement with the experimental results. The parameters of the jet field are mutated at the nozzle exit, the pulse decays near the nozzle, and then it gradually decays to environmental parameters. When the injection pressure increases, the parameters of flow field, such as the expansion volume of pulsed plasma jet, the size of Mach disk and the pressure, increase, and the turbulent mixing in the expansion process is also enhanced, which is characterized by the more fracture of the interface of the plasma and air. When the injection pressure reduces to 1 MPa, no Maher disk appears at nozzle.
Key words
ordnance science and technology /
electrothermal chemical launch /
plasma jet /
injection pressure /
extended property /
numerical simulation
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Footnotes
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