Analysis of the arc formed along the surface of a flat plate immersed in a laminar flow of gas

Au, S.; Santiago, J.; Smy, P. R.

doi:10.1049/ip-a-1.1984.0077

Cited by 2 publications

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References 1 publication

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“…6. Time-resolved picture of the arc cross section viewed parallel ( I ) and perpendicular (2) to the plate. Arc currents were at (a) 180Aand (b) 162A.…”

Section: Resultsmentioning

confidence: 99%

Temperature profile of a boundary-layer arc

Au¹,

Smy²

1988

Can. J. Phys.

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The interaction between an arc immersed in a high-speed gas flow and an adjacent plane surface has been studied experimentally. The high-speed flow is generated in a conventional pressure-driven shock tube and the arc is supplied by a charged capacitor bank.The thickness of the arc layer has been monitored using a streak camera, and it is found that the distance from the surface to the point of maximum brightness in the arc is, in fact, within about 30% of theoretical predictions. Microdensitometric analysis of the streak photographs together with the use of a simple power-law relationship betwcen plasma luminosity and plasma temperature generate temperature profiles through the arc layer; again these are very similar to thcir theoretical counterparts.L'interaction entre un arc immergC dans un Ccoulement gazeux a haute vitesse et une surface plane adjacente a CtC CtudiCe expCrimentalement. L'Ccoulement a haute vitesse est produit dans un tube de choc conventionnel active par pression, et I'on est aliment6 par une batterie de condensateurs chargCs.La variation d'kpaisseur de la couche oh I'arc se produit a CtC suivie en utilisant une camCra ultra-rapide et I'on a trouvC que la distance entre la surface et le point le plus brillant dans I'arc ne s'tcarte que par environ 30% des pridictions thioriques. L'analyse microdensitomCtrique des photographies, jointe a I'utilisation d'une simple loi de puissance pour la relation entre la IuminositC et la tempkrature du plasma, donne des profils de tempCrature dans I'axe qui sont, eux aussi, tres semblables aux profils thCoriques.[Traduit par la revue]Can.

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“…6. Time-resolved picture of the arc cross section viewed parallel ( I ) and perpendicular (2) to the plate. Arc currents were at (a) 180Aand (b) 162A.…”

Section: Resultsmentioning

confidence: 99%

Temperature profile of a boundary-layer arc

Au¹,

Smy²

1988

Can. J. Phys.

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Ablation by pulsed plasma jets

Haley

Smy

1994

J. Phys. D: Appl. Phys.

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The ability of pulsed plasma jet igniters to evaporate liquid fuel when cold-starting alcohol- and diesel-fueled automobile engines is investigated using solid samples of wax (which is thermally similar to alcohol), polymethylmethacrylate and glass. The known properties of the plasma jet imply a potential rate of heat transfer from the jet to an adjacent surface of the order of 108 W m-2. The computed flux thresholds for evaporation of wax and polymethylmethacrylate are of the order of 107-108 W m-2 and in fact a mass evaporation of 10-9-10-8 kg per pulse is measured. The threshold for glass is in excess of 108 W m-2 and no evaporation is observed. The mass of wax evaporated is in good agreement with calculations made on the basis of a self-limiting mechanism in which an insulating layer of vapour is established at the surface through an equilibrium between evaporation of material into the layer and convection of plasma into the layer.

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Analysis of the arc formed along the surface of a flat plate immersed in a laminar flow of gas

Cited by 2 publications

References 1 publication

Temperature profile of a boundary-layer arc

Temperature profile of a boundary-layer arc

Ablation by pulsed plasma jets

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