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In order to assess the influence of high vibrational temperatures typically found in shock-tunnel-generated flows on model surface heat flux, measurements are compared to simulations using the DSMC (direct simulation Monte Carlo) method. The two limiting cases of either full accommodation of molecular vibrational energy to the surface temperature or none at all are simulated for three shock tunnel conditions using Nitrogen (N2) as a test gas. The conditions mainly differ by an order of magnitude in density, however, all three comparisons to the corresponding measurements suggest that vibrational surface relaxation happens only to a small extent. While model surface pressure is not affected, heat fluxes differ by up to 20%, depending on the modelling. Furthermore, lower flow densities generally lead to higher differences.

Influence of Molecular Vibrational Energy Accommodation Modeling on Cone Surface Heat FLUX at Mach 10