To solve the problem of lacking high temperature data in chemical reaction models and explore the application capacity of the Quantum Kinetic (QK) model, this paper further applies this model to the reentry flow of the Mars exploration vehicle for numerical prediction of rarefied aerodynamic characteristics. Via calculation of the flow field of the Pathfinder at the heights of 85 km, 95 km, 110 km, respectively, the performance of the QK model and the influence of the rarefied gas effect are evaluated. Results show that the QK model which relies not on the macroscopic reaction rates is suitable for the Mars reentry flows. The rarefied aerodynamics is not sensitive to the chemical reaction and its model; however, the influence of the chemical reaction on the aerothermodynamics cannot be neglected. The heat flux on the stagnation point can reduce by about 12%-14% after the chemical reaction is considered.
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