Relaxation Processes in Expanding Flows of Combustion Products
Abstract
The report presents the results of an analysis of the vibrational relaxation of a combustion gas mixture in an expanding core flow field of both a conical and contoured nozzle. The species considered are CO, H2, CO2, and H2O while the vibrational excitation is characterized through the species CO(v=1), H2(v=1), CO2(nu sub 3), CO2(nu sub 2), H2)(nu sub 3) and H2O(nu sub 2). It is found in this analysis that the vibrational modes of the diatomics effectively freeze at the nozzle exit conditions, the nu sub 2 modes of the polyatomics stay close to equilibrium with the decreasing kinetic temperature while the nu sub 3 modes freeze at intermediate values between the exit temperature and the decreasing kinetic temperature. The sensitivity of the vibrational relaxation to the assumed rate coefficients is discussed together with the influence of downstream shock structure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1971
- Accession Number
- AD0746279
Entities
People
- Edward R. Fisher
- Frederick P. Boynton
Organizations
- Wayne State University