Influence of thermochemical nonequilibrium on characteristics of boundary layer at flight in the Martian atmosphere

In framework on the $e^N$-method, comparative calculations of position beginning zone of laminar-turbulent transition completed for two points on landing trajectory of “Pathfinder” spacecraft on surface of the Mars. The calculations used a three-component model of a thermochemical nonequilibrium mixture $\textrm{CO}_2/\textrm{CO}/\textrm{O}$. The set of frequencies of spatial disturbances is determined along neutral curves for first unstable modes of temporary disturbances. The transition Reynolds number $\textrm{Re}_{\delta T}$ was determined from envelopes of families of the $N$-factor curves at $N_T = 8$. In hypersonic regime at $\textrm{M}=12.6$, taking into account the developed thermochemical nonequilibrium leads to a significant decrease in the static temperature of gas in the lower part of the boundary layer. As a result, beginning of the zone of laminar-turbulent transition shifts downstream by approximately 9% compared to case of a perfect gas.