Based on the axisymmetric N-S equation and the 7-component 18 chemical reaction

the flow fields around the RAMC-Ⅱ vehicle at the reentry height between 20 km to 90 km were numerically simulated and the algorithm was verified. Not only was the electron number density distribution calculated

but also the collision frequency

average temperature and total pressure distribution at different reentry heights were given. The analysis showed that the electron number density inecreased first and then decreased with the increasing reentry height. When the reentry height was constant

the electron number density decreased with the axial direction

and the Gaussian distribution was consistent along the direction perpendicular to the surface of the vehicle. The maximum value of collision frequency decreased with the increase of the reentry height. When the reentry height was constant

the collision frequency decreased in the axial direction. The maximum average temperature at the same reentry height gradually decreased with the axial distance. The maximum total pressure decreased with the increase of reentry height

and the maximum total pressure decreased with the axial distance at the same reentry height.