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Temperature and pressure profiles of an ablation-controlled arc plasma in air
KTH, School of Electrical Engineering and Computer Science (EECS), Electromagnetic Engineering. KTH Royal Inst Technol, Sch Elect Engn & Comp Sci, S-10044 Stockholm, Sweden.;ABB Corp Res, S-72226 Vasteras, Sweden..ORCID iD: 0000-0002-6375-6142
KTH, School of Electrical Engineering and Computer Science (EECS), Electromagnetic Engineering.
INP Leibniz Inst Plasma Sci & Technol, D-17489 Greifswald, Germany..
INP Leibniz Inst Plasma Sci & Technol, D-17489 Greifswald, Germany..
2019 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 52, no 43, article id 434003Article in journal (Refereed) Published
Abstract [en]

Experimental measurements of the spatial distribution of temperature and composition of ablation-controlled arc plasmas are a key to validate the predictions of metal evaporation and polymer ablation models. Thus, high-speed photography and space-resolved spectroscopic measurements have been performed to characterize a stable air arc plasma jet controlled by ablation of a polymer nozzle made of Polyoxymethylene copolymer (POM-C) or polyamide (PA6). The spectroscopic analysis is performed along a plane perpendicular to the arc jet axis for a current of 1.8 kA, corresponding to an estimated current density of similar to 65 A mm(-2). Temperature and partial pressure profiles of the plasma for copper, hydrogen and carbon in the gas mixture are estimated as an inverse optimization problem by using measured side-on radiance spectra and radiative transfer spectral simulations. It is shown that the generated ablation-controlled arc has a complicated, non-uniform gas composition. Thus, the generated arc jet has a thin metallic core with a lower almost constant hydrogen pressure, surrounded by a thicker hydrogen and carbon mantle at partial pressures slightly lower than atmospheric pressure. The separation of hydrogen and carbon in the core is a consequence of demixing of the polymer vapour in the plasma. It is found that the overall shape of the temperature and pressure profiles obtained for the arc plasmas with the POM-C and PA6 nozzles are similar although differ in peak values and width.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 52, no 43, article id 434003
Keywords [en]
thermal plasmas, polymer ablation, plasma diagnostics
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-257534DOI: 10.1088/1361-6463/ab34b6ISI: 000480322000001Scopus ID: 2-s2.0-85072318410OAI: oai:DiVA.org:kth-257534DiVA, id: diva2:1352398
Note

QC 20190918

Available from: 2019-09-18 Created: 2019-09-18 Last updated: 2019-10-04Bibliographically approved

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Becerra Garcia, MarleyPettersson, Jonas

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