PLASMUT - Nonequilibrium Gas-Surface Interactions at High Temperature, VKI Plasmatron and Mutation++Library
Abstract
In this report, we highlighted the major theoretical, numerical, and experimental research activities, conducted at the von Karman Institute for Fluid Dynamics with the aim of improving our understanding of gas-surface interaction phenomena. The activities were divided in two tasks. During the year 2018-2019, we focused our attention on accomplishing task 1: review of the experimental methods and facility setup as well as of the data concerning the gas surface interaction of different experimental campaigns; furthermore equations describing the the gas-surface interaction were abstracted and included in the VKI library Mutation . Task 2, continued within the following 2 years, focused on the investigation of complex gas-surface interaction phenomena. Within this framework, equations describing thermal non-equilibrium at the surface were derived and included in the Mutation library. It was shown that assuming strong non-equilibrium at the surface better capture the experimentally observed temperature, both in the boundary layer and on the surface, while still well describing the surface recession. As second step, the finite rate chemistry model derived by Prof. Schwartzentruber team in relation to the AFOSR Grant FA9550-17-1-0057 Nonequilibrium Gas-Surface Interactions at High Temperature, was included in the Mutation library and validated. Numerical investigations revealed that the model, even if predicting a lower recession rate of the material, is able to capture reaction pressure dependence and nitrogen surface recombination. The VKI team also provided help to the University of Minnesota for the coupling of the Mutation library with the US3D solver, making available both the gas surface interaction model and gas phase state-of-the-art modeling. Along with the recent advances in numerical modelling, VKI conducted an experimental campaign on the ablation phenomena of graphite nitrogen plasmas.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 21, 2021
- Accession Number
- AD1165476
Entities
People
- A. Turchi
- Bernd Helber
- G. Bellas
- G. Kale
- Michele Capriati
- Olivier Chazot
- Thierry E. Magin
Organizations
- von Kármán Institute for Fluid Dynamics