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Titolo:
Emission and raman spectroscopy measurements in hypersonic nitrogen flows
Autore:
Pilverdier, H; Brun, R; Dumitrescu, MP;
Indirizzi:
Univ Aix Marseille 1, Inst Univ Syst Therm Ind, CNRS 6595, F-13453 Marseille 13, France Univ Aix Marseille 1 Marseille France 13 5, F-13453 Marseille 13, France
Titolo Testata:
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
fascicolo: 4, volume: 15, anno: 2001,
pagine: 484 - 490
SICI:
0887-8722(200110/12)15:4<484:EARSMI>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Pilverdier, H Univ Aix Marseille 1, Inst Univ Syst Therm Ind, CNRS 6595, F-13453 Marseille 13, France Univ Aix Marseille 1 Marseille France 13 seille 13, France
Citazione:
H. Pilverdier et al., "Emission and raman spectroscopy measurements in hypersonic nitrogen flows", J THERMOPHY, 15(4), 2001, pp. 484-490

Abstract

The self-luminosity of nitrogen hypersonic flows in the free-piston shock tunnel TCM2 at Marseille is analyzed for different enthalpy conditions. To perform vibrational population measurements in these flows by spontaneous Raman spectroscopy (SRS), the intensity of this emission is tentatively reduced by acting on various technical parameters and flow conditions. Thus a few low-enthalpy conditions are defined for which the SRS method can be usedwithout being disturbed too much by the flow emission at the nozzle exit and behind the bow shock of a blunt body. For these conditions the vibrational populations of the first several vibrational levels of nitrogen are determined during the steady phase of the flow: The vibrational temperatures defined from the population of these levels correspond to the values given byclassical computations assuming Landau-Teller models, that is, the expected frozen value at the nozzle exit and a value close to equilibrium behind abow shock. However, an overpopulation of the highest levels cannot also beexcluded.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/21 alle ore 03:29:54