Ptindamental Problem In Computing Radiating Flow Fields With Thick Shock Waves

Dean R. Chapman; Kurt A. Fiscko; Forrest E. Lumpkin

doi:10.1117/12.943985

18 May 1988 Ptindamental Problem In Computing Radiating Flow Fields With Thick Shock Waves

Dean R. Chapman, Kurt A. Fiscko, Forrest E. Lumpkin

Proceedings Volume 0879, Sensing, Discrimination, and Signal Processing and Superconducting Materials and Intrumentation; (1988) https://doi.org/10.1117/12.943985
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

Abstract

At high altitudes the thickness of a hypersonic shock wave in front of a hard body becomes sizable compared to the shock standoff distance. Peak radiation intensity occurs within the shock wave structure itself. In order to compute accurately hard body radiation in flows at high altitude with thick shock waves, the motion equations must be capable of yielding realistic profiles of temperature and density through the structure of a hypersonic shock wave. The conventional Navier-Stokes equations do not provide this fundamental capability, since they yield hypersonic shock thicknesses in nitrogen that are about a factor of four too thin. An investigation is made of some possible reasons for this failure of the Navier-Stokes equations. Models for bulk viscosity in a monatomic gas are explored which yield a realistic thickness for the shock-wave density profile, but not the temperature profile, and hence are not satisfactory. A tentative computational model for nitrogen is explored which yields considerably more realistic results than the Navier-Stokes equations. This model involves a nonlinear stress-strain tensor, nonlinear heat flux vector, and non-equilibrium rotational energy.

Citation Download Citation

Dean R. Chapman, Kurt A. Fiscko, and Forrest E. Lumpkin "Ptindamental Problem In Computing Radiating Flow Fields With Thick Shock Waves", Proc. SPIE 0879, Sensing, Discrimination, and Signal Processing and Superconducting Materials and Intrumentation, (18 May 1988); https://doi.org/10.1117/12.943985

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