Advanced Models in Shock Waves

Abstract

Abstract:The paper presents three collisional-radiative models developed to investigate non-equilibrium chemistry and radiation in hypersonic shock tubes operating with different planetary atmospheres. An hybrid collisional-radiative model, employing the state-to-state kinetics of electronically excited states of molecules and the multi-temperature approximation for the vibrational degree of freedom is presented first, and applied to the numerical rebuilding of experimental shock tube emission spectra. Next, an hybrid collisional-radiative model for ionized air is presented. This model consider the state-tostate approach for electronic states of atoms and the multi-temperature model for the vibrational populations of diatomic molecules in their ground electronic state. A radiative transport equation is also solved to determine radiative source terms in the kinetic scheme and the enthalpy production due to radiation. The third model considers the state-to-state collisionalradiative model of Jupiter's atmosphere, self-consistently coupled with the Boltzmann equation for free electrons and the radiative transfer equation for the radiation transport in one-dimensional slab geometry.

Problems and perspectives of state-to-state kinetics for high enthalpy plasma flows (Invited)

“…2. This model has been applied to shock tube in hydrogen plasma [62] and in jovian atmosphere [63] using a 2D ray-tracing method. The evolution of the electron energy distribution function (eedf) is calculated solving the Boltzmann equation in the two-term approximation [64], which …”