| Journal: | Journal of the Brazilian Society of Mechanical Sciences |
| Database: | PERIÓDICA |
| System number: | 000312140 |
| ISSN: | 0100-7386 |
| Authors: | Pimentel, C.A.R1 Azevedo, J.L.F2 Figueira da Silva, L.F3 Deshaies, B |
| Institutions: | 1Instituto Tecnologico de Aeronautica, Centro Tecnico Aeroespacial, Sao Jose dos Campos, Sao Paulo. Brasil 2Instituto de Aeronautica e Espaco, Centro Tecnico Aeroespacial, Sao Jose dos Campos, Sao Paulo. Brasil 3Centre National de la Recherche Scientifique, Laboratoire de Combustion, Poitiers, Vienne. Francia |
| Year: | 2002 |
| Season: | Jul |
| Volumen: | 24 |
| Number: | 3 |
| Pages: | 149-157 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental |
| English abstract | The results of a numerical study of premixed Hydrogen-air flows ignition by an oblique shock wave (OSW) stabilized by a wedge are presented, in situations when initial and boundary conditions are such that transition between the initial OSW and an oblique detonation wave (ODW) is observed. More precisely, the objectives of the paper are: (i) to identify the different possible structures of the transition region that exist between the initial OSW and the resulting ODW and (ii) to evidence the effect on the ODW of an abrupt decrease of the wedge angle in such a way that the final part of the wedge surface becomes parallel to the initial flow. For such a geometrical configuration and for the initial and boundary conditions considered, the overdriven detonation supported by the initial wedge angle is found to relax towards a Chapman-Jouguet detonation in the region where the wedge surface is parallel to the initial flow. Computations are performed using an adaptive, unstructured grid, finite volume computer code previously developed for the sake of the computations of high speed, compressible flows of reactive gas mixtures. Physico-chemical properties are functions of the local mixture composition, temperature and pressure, and they are computed using the CHEMKIN-II subroutines |
| Disciplines: | Ingeniería |
| Keyword: | Ingeniería mecánica, Combustión supersónica, Ondas de choque, Detonaciones, Transiciones |
| Keyword: | Engineering, Mechanical engineering, Supersonic combustion, Shock waves, Detonations, Transitions |
| Full text: | Texto completo (Ver HTML) |
