AEROTHERMODYNAMIC METHODS FOR A MARS ENVIRONMENTAL SURVEY MARS ENTRY

Computational fluid dynamics models for the thermodynamics and transpo rt properties used in an equilibrium version of the Langley aerothermo dynamics upwind relaxation algorithm (LAURA) for Mars atmospheric entr ies are described. In addition, the physical models used in a nonequil ibrium version of LAURA for Mars-entry flows are described. Uncertaint ies exist in defining constants used in the transport properties for t he equilibrium model and in many of the physical models for the nonequ ilibrium version. Solutions from the two codes using the best availabl e constants are examined at the Mars-entry conditions characteristic o f the Mars environmental survey mission. While the flowfields are near thermal equilibrium, chemical nonequilibrium effects are present in t he entry cases examined. Convective heating at the stagnation point fo r these flows (assuming fully catalytic wall boundary conditions) is a pproximately 100 W/cm2. Radiative heating is negligible.