Model computations of the influence of carbon impurities on the ionization relaxation in krypton shock waves

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dc.identifier.uri Klages, D. Demmig, F. 2018-08-23T12:15:42Z 2018-08-23T12:15:42Z 1991
dc.identifier.citation Klages, D.; Demmig, F.: Model computations of the influence of carbon impurities on the ionization relaxation in krypton shock waves. In: Journal of Fluid Mechanics 232 (1991), Nr. 455, S. 455-467. DOI:
dc.description.abstract Chemical reactions in shock waves can be strongly affected by minute impurity concentrations. Thus it is not adequate to take into account the additional impurity electron production in relaxation studies simply by global adjustment of the atom—atom excitation cross-section constant to the measured electron density. A definite improvement, however, can only be achieved if the ionization relaxation model is extended to include all relevant impurity atom reactions. Consequently we treated the real test gas as a mixture of krypton and impurity carbon atoms. For the carbon model it is important to take the lower real excitation levels into consideration. Carrying out a sensitivity analysis we were able to reduce the number of reactions substantially. A comparison with experimental electron density profiles yielded 3. 0 × 10–-6 m2/J for the Kr—Kr excitation cross-section constant as well as values for the C—Kr constants. For a temperature of about 8000 K and an impurity concentration of about 40 p. p. m. it is shown that the impurity reactions dominate the electron production in the initial relaxation zone. This effect causes a pronounced decrease of the relaxation time with increasing concentration. By comparing computational results of the Kr—C model with those of the simplistic pure Kr model it is possible to explain the dependence of the Kr-Kr excitation cross-section constant on the impurity concentration and the plasma temperature. © 1991, Cambridge University Press. All rights reserved. eng
dc.language.iso eng
dc.publisher Cambridge : Cambridge University Press
dc.relation.ispartofseries Journal of Fluid Mechanics 232 (1991), Nr. 455
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
dc.subject Carbon--Impurities eng
dc.subject Ionization eng
dc.subject Mathematical Models eng
dc.subject Shock Waves--Chemical Reactions eng
dc.subject Ionization Relaxation eng
dc.subject Krypton Shock Waves eng
dc.subject Krypton eng
dc.subject.ddc 530 | Physik ger
dc.title Model computations of the influence of carbon impurities on the ionization relaxation in krypton shock waves eng
dc.type article
dc.type Text
dc.relation.issn 00221120
dc.bibliographicCitation.issue 455
dc.bibliographicCitation.volume 232
dc.bibliographicCitation.firstPage 455
dc.bibliographicCitation.lastPage 467
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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