The DC arc in a blocked nozzle
- 14 November 1979
- journal article
- Published by IOP Publishing in Journal of Physics D: Applied Physics
- Vol. 12 (11) , 1853-1865
- https://doi.org/10.1088/0022-3727/12/11/014
Abstract
The boundary layer integral method of analysis has been used to study the DC arc burning in the convergent-divergent nozzle of a gas blast circuit breaker. A particular case where the arc completely 'fills' the nozzle has been studied, since it is of special interest to designers of nozzles for circuit breakers. It is shown that for a given nozzle geometry the arc model is capable of predicting the current density at the nozzle throat where the mass flow approaches zero. This current density depends on the properties of the arc quenching medium, nozzle geometry and the stagnation pressure. Results are given for a particular nozzle shape, but the method of analysis is general.Keywords
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