QCT-based vibrational collisional models applied to nonequilibrium nozzle flows (Articolo in rivista)

Type
Label
  • QCT-based vibrational collisional models applied to nonequilibrium nozzle flows (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1140/epjd/e2012-30079-3 (literal)
Alternative label
  • A. Munafò, M. Panesi, R.L. Jaffe, G. Colonna, A. Bourdon, T.E. Magin (2012)
    QCT-based vibrational collisional models applied to nonequilibrium nozzle flows
    in The European physical journal. D, Atomic, molecular and optical physics (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • A. Munafò, M. Panesi, R.L. Jaffe, G. Colonna, A. Bourdon, T.E. Magin (literal)
Pagina inizio
  • 188 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 66 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 7 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Aeronautics and Aerospace Department, Von Karman Institute for Fluid Dynamics, Chaussée de Waterloo 72, 1640 Rhode-Saint-Genèse, Belgium ICES, University of Texas at Austin, 201 E. 24th Street, Austin, TX 78712, United States NASA Ames Research Center, Moffett field, CA 94035, United States CNR-Istituto di Metodologie Inorganiche e dei Plasmi, Via Amendola 122/D, 70126 Bari, Italy EM2C Laboratory, École Centrale Paris, CNRS UPR 288, 92290 Châtenay-Malabry, France (literal)
Titolo
  • QCT-based vibrational collisional models applied to nonequilibrium nozzle flows (literal)
Abstract
  • Thermal and chemical nonequilibrium effects are investigated in hypersonic nozzle expanding flows by means of vibrational collisional models. The rate coefficients for rovibrational dissociation and excitation are provided by two chemical databases for the N+N 2 system recently developed at NASA Ames Research Center and the University of Bari. Vibrationally averaged rate coefficients for N + N 2 collisions are computed based on the hypothesis of equilibrium between translational and rotational modes. N2+N 2 collisions are also considered based on literature data. Inviscid and quasi 1D governing equations are discretized in space by means of a finite volume method. A fully implicit time integration method is applied to obtain steady state solutions. Results show that, for both N + N 2 and N 2 + N 2 collision dominated flows, the populations of vibrational levels deviate from a Boltzmann distribution. An accurate investigation of vibrational level dynamics shows the different behavior of low and high-lying states. Comparison against experimental data acquired at the EAST facility of NASA Ames Research Center demonstrate good agreement between the computed and experimental results. (literal)
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