Collisional-Radiative Modeling In Flow Simulations
Abstract
The present notes address the modeling of high speed re-entry plasma flows under strong nonequilibrium conditions. At high re-entry speeds, a significant portion of the heating experienced by the spacecraft can be due to radiation and it is highly inuenced by the shape of the internal energy distribution function. In this notes, we propose a kinetic mechanism for air plasma under nonequilibrium conditions. We first analyze the behavior of the electronically excited state of the atoms in the post shock region during an high speed re-entry. The flight conditions are taken from FIRE II flight experiment and from the test conditions in the EAST shock tube facility. We move then to a more sophisticated model which accounts for non-boltzmann effects for electronic levels of atoms and molecules. Departure of the electronic energy level populations from Boltzmann distributions is found due to depletion of the high lying bound electronic states in the rapidly ionizing regime behind the strong shock wave.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 08, 2008
- Accession Number
- ADA586722
Entities
People
- Anne Bourdon
- Arnaud Bultel
- Marco Panesi
- Olivier Chazot
- Thierry Magin
- Yacine Babou
Organizations
- von Kármán Institute for Fluid Dynamics