At the 2001 AIAA Aerospace Sciences Meeting there was a blind comparison between computational simulations and experimental data for hypersonic double-cone and hollow cylinder-flare flows. This code validation exercise showed that in general there was good agreement between the continuum CFD simulations and experiments. Also, in general, there was good agreement between direct simulation Monte Carlo (DSMC) calculations and the experiments in regions of attached flow. However, in almost all of the computations, the heat transfer rate on the forebody of the cone was over-predicted by about 20%. The purpose of this paper is to report on our analysis of this difference. We perform CFD simulations of the hypersonic nozzle flow to assess the importance of vibrational nonequilibrium on the test conditions. We then recompute the flows using a new set of vibrational nonequilibrium conditions and consider the effects of a slip boundary condition at the model surface. Additionally, we analyze new heat transfer rate data on sharp and blunt 25° cones over a wider range of test conditions. This analysis appears to explain the discrepancy between the previous calculations and the experiments.
|Original language||English (US)|
|State||Published - Dec 1 2002|
|Event||40th AIAA Aerospace Sciences Meeting and Exhibit 2002 - Reno, NV, United States|
Duration: Jan 14 2002 → Jan 17 2002
|Other||40th AIAA Aerospace Sciences Meeting and Exhibit 2002|
|Period||1/14/02 → 1/17/02|