Chemical and vibrational nonequilibrium viscous flows: Modelling, internal and external flow applications
Abstract
A study aimed at the elaboration of a numerical code for solving chemical and vibrational nonequilibrium viscous flows is reported. This work includes the analysis and the use of several physical models (transport properties, thermodynamic functions, chemical kinetics, vibrational relaxation, and dissociation vibration coupling), the numerical analysis of equations with source terms (rendering implicit, Total Variation Diminishing (TVD) scheme), and applications to hypersonic flows for various nozzle and reentry body configurations. Quasimonodimensional Euler results are presented for the test nozzles R6 and F4, whose reservoir conditions are respectively, 50 bars, 4800K and 2000 bars, 8500K. Axisymmetric Navier-Stokes results for the flow around a sphere cylinder (Mach number M = 15.3) and around a hyperboloid (Mach number = 15.4) are detailed. The effects of each physical phenomenon (nonequilibrium, thermal conductivity, diffusion, vibration dissociation coupling) and numerical aspect (computational grid, averages) are studied. The results are in good agreement with those obtained by other calculations for both internal and external flows.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- August 1993
- Bibcode:
- 1993STIN...9426316F
- Keywords:
-
- Hypersonic Flow;
- Nonequilibrium Flow;
- Nozzle Flow;
- Reaction Kinetics;
- Reentry Vehicles;
- Viscous Flow;
- Computational Grids;
- Euler Equations Of Motion;
- Finite Volume Method;
- Mathematical Models;
- Molecular Relaxation;
- Navier-Stokes Equation;
- Tvd Schemes;
- Fluid Mechanics and Heat Transfer