Collisional-Radiative Modeling Behind Shock Waves in Nitrogen

Vibrational and electronic collisional-radiative model in air for Earth entry problems

“…This case has been already discussed for nitrogen with our model CoRaM-N 2 implemented in a CFD code. 11 In addition, electrons are more effective to induce inelastic collisions than heavy particles owing to their weak mass. Therefore, a quasi-steady state can be observed before thermal equilibrium.…”

“…Involved species, database Temperature and pressure in the shock layer vary over a wide range during the entry phase into the Earth's atmosphere. 11 The heavy particle temperature can reach $30 000 K and the pressure can be atmospheric. 12 Therefore, numerous species can be formed from nitrogen, oxygen, and argon.…”

“…This model is devoted to the study of the chemistry in nitrogen behind shock waves. 11 Actually, this CR model is a version of CoRaM-AIR reduced to the pure nitrogen compounds. 160 equations are required to determine the spatial profiles of the number density of the different 156 states.…”

Dissociative recombination in reactive flows related to planetary atmospheric entries

“…These elementary collisional processes take place simultaneously with elementary radiative processes, the list of which is given in [5,6]. The possible self-absorption of radiation by the flow is taken into account through the escape factor due to Holstein [22] for which a Doppler-type broadening has been assumed.…”

“…Let us only mention that the low density of the flow prevents the thermal equilibrium: electrons and heavy particles are characterized by different translation temperatures written T e and T A , respectively. The interested reader will find the mathematical form of these equations in [6,23].…”