2024 , Volume 29, № 3, p.5-24

The structure of the boundary layer on a ѕat surface under conditions of landing on Mars is studied. A two-temperature model of a vibrationally excited dissociating three-component gas comprising of CO2, CO and O mixture is introduced, which allows adequately reproducing the main characteristics of hypersonic ѕight in the Martian atmosphere. For two points of the landing trajectory on Mars, calculations of a ѕat boundary layer on a plate with an isothermal noncatalytic surface were performed. The profiles of gas-dynamic quantities obtained on the basis of locally self-similar equations are compared with the profiles obtained by the finite-difference method based on the complete equations of the boundary layer. It is shown that, with acceptableaccuracy for subsequent stability calculations, the proҥles obtained from the complete equations yield locally self-similar solutions. A comparison is made of the phase velocities of neutral (growing) perturbations obtained on the basis of the well-known criterion of the generalized inflection point and the corresponding generalization, which explicitly takes into account the conditions of developed dissociation.