Abstract
There are many known and emerging limitations to widely-used thermo-chemical models of nonequilibrium high-enthalpy flows. Furthermore, as advanced non-intrusive diagnostics methods begin to be applied to these flows, more issues are certain to be found. In this paper, I briefly discuss some of the main problems with current modeling approaches, and then focus on a specific aspect of these flows, namely the modeling of the carbon surface ablation process. We consider two main approaches for obtaining the surface chemical state: a saturated gas equilibrium assumption that is related to the B′ approach and a finite-rate surface kinetics model. It is shown that there are notable differences in the predicted overall surface mass flux, and particularly in the details of the individual species mass fluxes to and from the surface. In addition, several gas-phase kinetics models are used, and it is found that the gas-phase processes have important effects on the surface kinetics. From this study, it is clear that more detailed measurements of surface gas evolution under highly controlled conditions are required to validate and improve the existing models.
Original language | English (US) |
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DOIs | |
State | Published - 2012 |
Event | 50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition - Nashville, TN, United States Duration: Jan 9 2012 → Jan 12 2012 |
Other
Other | 50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition |
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Country/Territory | United States |
City | Nashville, TN |
Period | 1/9/12 → 1/12/12 |