Home – Home – Jornals – Thermophysics and Aeromechanics 2024 number 2

Considering some limitations of various macroscopic chemical reaction models including the total collision energy (TCE) and general collision energy (GCE) models, the new modification is implemented in the DSMC algorithm for numerical simulation of dissociation of the air along the stagnation line and around a typical hypersonic atmospheric blunt body, STS-2 in non-equilibrium conditions and modified model is compared with others conventional models. Since the TCE and GCE models are dependent on some experimental parameters ( A and B at Arrhenius rate of reaction equation). Also, due to lack of accuracy of the quantum kinetics model, modification version of chemical reaction models is presented as hybrid of modified quantum kinetics (MQK) and modified collision energy (MCE) which this method is able to extract A and B parameters without need experimental background. Accuracy of the current applied chemical model for calculation of flow field characteristics is assessed by comparison of their results with other methods (analytical models and available experimental data). The results indicate that the modification of hybrid model with advantages of independency of the empirical parameters gives more accurate results and provides more accurate solution compared to conventional methods without need A and B constant experimental parameters.