This paper studied 6 kinds of energy transfer of thermodynamic collision and 8 types of chemical reaction on unstructured grids.Subroutine flow charts of the energy transfer and chemical reaction collision mentioned above were proposed in detail.Based on variable hard sphere(VHS) model

Borgnakke-Larsen phenomenological model

chemical reaction model of Bird and Cercignani-Lampis-Lord(CLL) gas surface interaction model

a rarefied gas direct simulation Monte-Carlo(DSMC) code was produced using Fortran

enabling to simulate relaxation of internal energies

thermodynamic nonequilibrium and chemical reaction nonequilibrium.The computation of towed ballute applications of 8 cases was completed in the Earth's and Mars' atmosphere

in which Knudsen number changes from 0.05 to 30.0

flight Mach number changes from 26.3 to 11.2.The results were compared with the computation published by James N.Moss from NASA Langley Research Center in 2007

showing satisfactory agreement.In addition

this paper analyzed thermodynamic nonequilibrium

chemical reaction nonequilibrium and heat transfer efficiency of vehicle wall

by using |T-Tv|/T

Damkhler number and Stanton number

respectively.The analysis is beneficial to thermal protection design of high temperature assemblies.