Gasdynamics and turbulent cooling of after-spark and Arc channels

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Abstract

A simple theoretical model of spark channel isobaric cooling in gas is considered. The model takes into account the turbulence generation and its effect on cooling and expansion of the channel. Basic mechanisms of degradation of turbulent pulsations are analyzed and taken into account. If the intensity of arising vortical motion is relatively small then during the characteristic time of cooling the kinetic energy is concentrated in pulsations of the maximal sizes, which are of order of the channel radius, the viscosity being unessential for such pulsations and the turbulent kinetic energy per unit mass decreases due to increasing of the gas mass involving into the vortical motion restricted in space, i.e. the cascadeless mechanism of dissipation occurs. For this case a closed system of the first order differential equations for the radius, internal and kinetic energies is obtained. This system (together with adopted initial conditions) makes it possible to calculate the whole process of afterdischarge channel cooling.lf so intensive vortical motion arises in the cooling channel (after more intensive discharges) that the developed turbulent pulsation spectrum (leading to the rapid viscous dissipation of kinetic energy of turbulence in the shortwave range of spectrum) is formed for the time less than the characteristic time of cooling [the restoration time of the dielectric strength (RDS)] then cascade mechanism of dissipation (CMD) becomes to be essential, together with cascadeless one. For this case an improved version of the model is suggested, in which the cascade energy flow over scale spectrum being taken into account and allows one, in particular, to show a possibility of the sharp decrease in the RDS rate occurring well in advance of its completion.

Original languageEnglish (US)
StatePublished - 1995
Externally publishedYes
Event26th Plasmadynamics and Lasers Conference, 1995 - San Diego, United States
Duration: Jun 19 1995Jun 22 1995

Conference

Conference26th Plasmadynamics and Lasers Conference, 1995
Country/TerritoryUnited States
CitySan Diego
Period6/19/956/22/95

All Science Journal Classification (ASJC) codes

  • General Engineering

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