DSMC Study of Flowfield and Kinetic Effects on Vibrational Excitations in Jet-Freestream Interactions
Abstract
The Direct Simulation Monte Carlo (DSMC) computational technique was used to simulate the interaction between a carbon monoxide jet and a high velocity free stream of oxygen atoms oriented at 90 degrees to the jet flow axis at 150 kilometers simulated altitude. The results of a study to characterize the sensitivity of predicted carbon monoxide vibrational excitation to the vibrational excitation cross section and the nozzle exit plane profile are presented in this paper. A literature value of the vibrational excitation cross section is used as a baseline, and comparative simulations are made for cross sections that vary around that value. Similarly, the nozzle exit plane profile is varied from a "flat" profile to a fully developed laminar boundary layer profile to obtain sensitivities to the jet inflow startline. xSMlLE, a software system based on the DSMC method, developed at the Institute of Theoretical and Applied Mechanics, Novosibirsk, Russia, has been utilized for this study. The results demonstrate a generally linear scaling of the vibrational excitation with cross section, except for cross sections that produce excitation rates in excess of the VHS gas kinetic rate. The jet exit-plane boundary layer profile was found to be a factor in the amount of carbon monoxide excited state produced in the interaction region. (1 table, 11 figures, 9 refs.)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 21, 2002
- Accession Number
- ADA410980
Entities
People
- David H. Campbell
- Ingrid J. Wysong