10th International Workshop on Radiation of High Temperature Gases for Space Missions

Session

State to state and Collisional Radiative Modelling

CRM

9 Sept 2024, 09:50

Oxford e-Research Centre (University Oxford)

139. Ab Initio Electronic Structure Calculations of CNN for CN Excitation Studies

Eric Geistfeld (NASA)

09/09/2024, 09:50

State to state and Collisional Radiative Modelling

Background

Titan's atmosphere is composed mostly of $\textrm{N}_2$ with a small amount of $\textrm{CH}_4$, and so, shock layers around craft entering Titan's atmosphere will contain a variety of molecules formed from H, C, and N atoms, including the cyanogen radical CN. Sensitivity analysis has shown that the radiative heat flux predicted by computational fluid dynamics (CFD) simulations...

136. State-to-State investigation of hypersonic high-enthalpy nitrogen flows

Francesco Bonelli (Politecnico di Bari)

09/09/2024, 11:00

State to state and Collisional Radiative Modelling

Background of the study

Nowadays, reusable vehicles to access space are very attractive for cost reduction. Many reusable spacecrafts, such as Space Shuttle, have been conceived for both orbital and suborbital services [1]. These vehicles must withstand very high temperatures when they fly at hypersonic speeds in the continuum regime, and an adequate Thermal Protection System (TPS) is...

148. Electronic State-to-State Modelling of a Recombining N2/Argon Plasma and Comparisons with Experiments

Ulysse Dubuet (Laboratoire EM2C, CNRS, CentraleSupélec, Université Paris-Saclay)

09/09/2024, 11:25

State to state and Collisional Radiative Modelling

An electronic state-to-state kinetic model for nitrogen/argon mixtures is obtained by reduction of a state-of-the-art vibronic-specific model. The model is used to study nitrogen recombination. A high-temperature plasma initially at local thermodynamic equilibrium at 6750 K and 1 atm passes through a water-cooled tube that forces rapid cooling and nonequilibrium recombination. Simulations...

155. Collisional-Radiative Modeling of Air Plasma Generation at Suborbital Hypersonic Velocities

Timothy Aiken (University of Colorado)

09/09/2024, 11:50

State to state and Collisional Radiative Modelling

A novel collisional-radiative model for air plasmas is developed, with particular attention paid to the modeling fidelity for heavy particle impact excitation and associative ionization. The model is compared with a number of shock tube experiments, and is then used to explore the dynamics of associative ionization and electron impact ionization.

153. Multi-temperature model for giant planet atmospheres

Gianpiero Colonna (PLASMI Lab at CNR-NANOTEC)

12/09/2024, 09:00

State to state and Collisional Radiative Modelling

Introduction

In the last years, state-to-state (StS) chemical kinetics have been used to model high-enthalpy flows in 2D configurations in dissociating air [Bonelli et al., 2024; Guo et al., 2024; Wang et al., 2023]. The recent interest in the exploration of ice giant planets [Blanc et al., 2021] needs the construction of kinetic schemes for Hydrogen/Helium mixture plus some impurities...

161. Thermodynamics and transport properties for the characterization of ice giant entry conditions

Annarita Laricchiuta (CNR ISTP Bari)

12/09/2024, 09:25

State to state and Collisional Radiative Modelling

Introduction

In the last years, state-to-state (StS) chemical kinetics have been used to model high-enthalpy flows in 2D configurations in dissociating air [Bonelli et al., 2024; Guo et al., 2024; Wang et al., 2023]. The recent interest in the exploration of ice giant planets [Blanc et al., 2021] needs the construction of kinetic schemes for Hydrogen/Helium mixture plus some impurities...

166. Comparative assessment of state-to-state and macroscopic multi-temperature modeling for atmospheric re-entry conditions on ice giants

Dr Marco Fossati (University of Strathclyde)

12/09/2024, 09:50

State to state and Collisional Radiative Modelling

Background of the study

The continuous study of ice giants, Uranus and Neptune is critical to advance our understanding of the solar system's origin and evolution. Despite being subject of numerous previous studies, fundamental questions still remain about the composition and thermal behaviour of their atmosphere and about the planets’ bulk composition. It is therefore paramount to...

174. Simplifying Chemical Kinetics in Hypersonics Non-Equilibrium Flows for Earth Re-entry

Claudio Rapisarda (University of Oxford)

12/09/2024, 10:15

State to state and Collisional Radiative Modelling

Background to the study

Thermal-chemical kinetics for non-equilibrium flows can be accurately represented through state-to-state (StS) models, where each molecular energy state is treated as a distinct pseudo-species. However, StS modeling requires a significantly larger number of variables than multi-temperature models, as it involves hundreds of internal energy states and thousands of...