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Nonequilibrium shock-heated nitrogen flows using a rovibrational state-to-state method.

M Panesi1, A Munafò2, T E Magin2

  • 1University of Illinois at Urbana-Champaign, Urbana, 104 S. Wright street, Champaign, Illinois 61801, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 15, 2014
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Summary
This summary is machine-generated.

This study reveals that rotational and vibrational relaxation occur at the same rate in nitrogen shock waves, challenging common assumptions. Reduced models inaccurately predict thermalization and dissociation during atmospheric reentry.

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Area of Science:

  • * Computational fluid dynamics
  • * Chemical kinetics
  • * Aerospace engineering

Background:

  • * Understanding nonequilibrium phenomena in high-enthalpy gas flows is crucial for atmospheric reentry.
  • * Accurate modeling of internal energy excitation and dissociation is essential for predicting vehicle thermal loads.
  • * Previous models often rely on simplified assumptions about energy relaxation processes.

Purpose of the Study:

  • * To develop and validate a comprehensive rovibrational collisional model for nitrogen shock waves.
  • * To investigate internal energy excitation and dissociation processes under reentry conditions.
  • * To assess the accuracy of reduced-order models against a full rovibrational model.

Main Methods:

  • * Development of a rovibrational collisional model coupled with a 1D flow solver.
  • * Utilizing ab initio reaction rate coefficients from the NASA Ames Research Center database.
  • * Analysis of rovibrational level populations and comparison with reduced models.

Main Results:

  • * Rotational and vibrational relaxation were found to proceed at comparable rates, contradicting the assumption of concurrent translational-rotational relaxation.
  • * Exchange processes significantly impact gas relaxation, while predissociation effects are negligible.
  • * Reduced order models (vibrational collisional and multitemperature) overestimate thermalization and dissociation.

Conclusions:

  • * The full rovibrational collisional model provides a more accurate description of nonequilibrium phenomena in nitrogen shock waves.
  • * Reduced models fail due to incorrect assumptions regarding rotational-translational equilibrium and quasi-steady-state conditions.
  • * Accurate thermochemical relaxation prediction requires accounting for detailed rovibrational energy transfer processes.