Transient Two-Dimensional Calculations of Properties of Forced Convection-Stabilized Electric Arcs

Mitchell, Robert; Tuma, D. T.; Osterle, J. F.

doi:10.1109/tps.1985.4316401

Cited by 22 publications

(21 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More recently, results obtained by the numerical solution of the differential conservation equations have been reported in the literature [5-71. Lowke [5] has presented the computed results of the BBC arc and Mitchell and co-workers [7] have concentrated their attention on the upstream region of the nozzle throat. However, the form of energy conservation equation used in these investigations is only correct if the expansion cooling can be neglected.…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigation of a 2 kA DC nitrogen arc in a supersonic nozzle

Zhang

Fang

Newland

1987

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The arc conservation equations based on laminar flow and on the boundary layer assumption have been solved for a 2 kA DC nitrogen arc burning in a supersonic nozzle at a stagnation pressure of 23 atm. An approximate radiation transport model is used to account for the emission and absorption of radiation. The computed results are in good agreement with experiments. A hybrid approach (i.e. a combination of integral and differential methods) is used to predict the pressure in the nozzle in the presence of the arc. It has been found that isothermal external flow provides the best agreement between the calculated and the measured pressures. The relative importance of radiation transport, convection (both enthalpy and kinetic energy) and thermal conduction is discussed. It has also been found that in the region upstream of the nozzle throat there is a radial inflow heated up by strong radiation absorption while in the supersonic region this flow changes its direction. The outward radial flow provides the energy source for the arc to expand axially in the thermal layer. Viscous stresses play a very small role in momentum balance and axial velocity profiles are typical of those of inviscid fluid flows.

show abstract

Section: Introductionmentioning

confidence: 99%

Theoretical investigation of a 2 kA DC nitrogen arc in a supersonic nozzle

Zhang

Fang

Newland

1987

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…The results of Mitchell and Tuma along with the measurements of Graf [14] et al show that the radial temperature profile is constricted with a peak instead at the center -Mitchell et al have applied a two-dimensional transient model of forced convection stabilized arc. It solves the LTE conservation equations for mass, momentum and energy, using an implicit finite-difference technique for marching in the axial and time dimensions and find the upstream values for temperature T(r, z = 0, t) by using downstream information about the gas flow.…”

Section: Convection Of Enthalpymentioning

confidence: 96%

“…During the 1980-1990 decade Mitchell and Tuma [14] developed a computational model for solving the conservation equations along with…”

Section: Theoretical Modeling Of Forced Convectionstabilized Arcsmentioning

confidence: 99%

“…-The radial momentum equation is approximated When circuit breaker arcs carry very high currents operating with temperatures of the order of 20,000 K the radiation becomes the dominant mechanism of energy transport within the arc [14]. Losses at the arc centre are dominated by the radiation losses and the arc is approximately arc plasma rather than lost as radiation.…”

Section: Theoretical Modeling Of Forced Convectionstabilized Arcsmentioning

confidence: 99%

See 1 more Smart Citation

Some common performance characteristics of gas-blast interrupters and power expulsion fuses

Ramirez¹

2007

2007 8th International Conference on Electric Fuses and Their Applications

View full text Add to dashboard Cite

In this paper are described some common performance similarities of the medium voltage power expulsion fuses and gas-blast circuit breakers. Also is presented a short review of their mechanical operating characteristics paying attention to the movement of contacts and arcing electrodes in both type of devices. And their interaction with the power electric system. Finally is presented a shallow review through the time of the developments made by different researchers, adding a little more emphasis on the so-called conservation equations; the field of their scope and the improvements on the applied mathematics, for instance the change from ordinary to partial differential equations which are more adequated when studying the transient period after current zero on circuit breakers mainly.

show abstract

“…There has been increasing interest in fully understanding the arc extinguishing process in order to develop highly reliable gas circuit breakers [1][2][3]. However, in the process of extinguishing, relatively low electron densities and poor reproducibility of discharge paths have been limiting the acquisition of data on electron and other particle densities, which are needed to construct an arc model.…”

Section: Introductionmentioning

confidence: 99%