The Influence of Turbulence on Current Interruption

Jones, G.R.

doi:10.1007/978-1-4757-1685-6_4

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…A knowledge of the axial distribution of electric-field strength is important since on account of the current being axially constant, it also represents the axial variation of electric power dissipated in the arc. Such electric-field distributions (figure 12(c)) have been measured using voltage probe techniques (Jones et a1 1975, Chapman andJones 1978) and are in good agreement with integral boundary layer predictions (e.g. Malghan et al 1977).…”

Section: The Properties Of Arcs In Acceleratingsupporting

confidence: 70%

“…Downstream of the nozzle throat the straining effects may be reversed on account of adverse property and flow variations so producing an expansion rather than a contraction of the arc cross section (e.g. Jones 1978).…”

Section: Theoretical Description Of Arcs In Axialjowmentioning

confidence: 99%

“…However, the electrode exerting most influence upon the properties is the upstream electrode, whether it be cathode or anode, due to the dominant unidirectional influence of the imposed flow. Also, unlike the free-burning arc case, the formation of an electrode vapour jet, distinct from the host arc plasma, does not occur for arc currents below about 20 kA regardless of electrode material, host plasma and nozzle geometry (Airey et al 1975, Walmsley andJones 1978). Although only limited information exists concerning such vapour jets, it is clear that they are extremely rich in electrode material concentration ( -70%) (Airey et a1 1976) even at long distances from the upstream electrode.…”

Section: The Properties Of Arcs In Acceleratingmentioning

confidence: 99%

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The physics of high-power arcs

Jones

Fang

1980

Rep. Prog. Phys.

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Recent progress in the physics of high-power arcs has been largely due to a blend of detailed experimental and theoretical investigations aimed at explaining the electrical behaviour of the discharge in terms of fundamental physical processes.I n the case of collision-dominated, high-pressure arcs the important role of radiative energy transfer, including strong self-absorption, has been established through the experimental and theoretical study of cylindrically symmetric, uncontaminated arc plasmas. As a result, an insight has been gained into the additional complications produced in naturally occurring high-pressure arcs by electrode vapour contamination and self-magnetically-propelled plasma flows. Application of the boundary layer integral method of aerodynamics in conjunction with extensive property measurements has enabled the higher-power dissipation capabilities of arcs in imposed axial flows to be related to flow acceleration and turbulent exchange processes. Integral methods have also given an insight into arc properties and behaviour in the presence of severe ablation of an arc-confining wall.The application of similarity theory based upon the conservation equations of fluid mechanics has produced good correlation of the properties of arcs in transverse flows and magnetic fields under a number of different operating conditions. Criteria defining stable arc operation have been derived using stability theory whilst axisymmetric instabilities of arcs in accelerating flows have been related to vortex production at the arc boundary.Although much detailed experimental and theoretical studies have also been made of arcs in vacuum, there remains a need for a general theoretical description. I n addition, despite agreement that cathode processes exert a strong influence upon vacuum arc properties, there is uncertainty concerning the proportion and spatial distributions of the various particle species emitted by the cathode. Nonetheless a qualitative appreciation of the processes governing the overall electrical characteristics for different current ranges has been achieved.

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Section: The Properties Of Arcs In Acceleratingsupporting

confidence: 70%

Section: Theoretical Description Of Arcs In Axialjowmentioning

confidence: 99%

Section: The Properties Of Arcs In Acceleratingmentioning

confidence: 99%

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The physics of high-power arcs

Jones

Fang

1980

Rep. Prog. Phys.

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“…Recent theoretical and experimental work on current interruption in gas-blast breakers has emphasised the role of turbulence as a critical energy-dissipating mechanism shortly before and during the recovery process (Swanson et al 1971, Hermann et al 1976, Howatson and Topham 1976, El Akkari and Tuma 1977, Hermann and Ragaller 1977, Jones 1977, Swanson 1977. As a general result of this work the turbulent exchange between arc and flow in the downstream nozzle section has been assigned a very important role.…”

Section: Introductionmentioning

confidence: 91%

Measurements of post-zero current and of power loss in air-blast arcs

Frind

Prescott

Noy

1979

J. Phys. D: Appl. Phys.

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The Mathematical Modelling of the Switching Arc

Bergmann

Grams

Rother

1985

Contrib Plasma Phys

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Dedicated to the 80th birthday of Prof. Dr. phil. Dr. rer. nat. hc. mult. R. ROMPE SummaryFor developing and optimizing of high-voltage SF,-puffer bre'ker a m.ithemiitica1 model of the switching arc is an important tool for the manufacturer. A physico-mathematical model was build up to simulate the behaviour of the switching nrc near current zero. To proof the model the influence of steepness of current and voltage, of the gas pressure and the position of the upstream electrode on the breaking capacity have been calculated. First work has been done to use the model to simulate the dielectric behaviour too. To minimize computer time and to get more informations on the integral model the characteristic functions have been calculated with the pmmodel. The result shows the influence of the steepness of the current before current zero.

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The Influence of Turbulence on Current Interruption

Cited by 5 publications

References 13 publications

The physics of high-power arcs

The physics of high-power arcs

Measurements of post-zero current and of power loss in air-blast arcs

The Mathematical Modelling of the Switching Arc

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