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Interaction between reaction and flowfield in supersonic combustors

Tomioka S., Mitani T., Nagata H., Ujiie Y., Kono M.

Archivum Combustionis

2001

Vol. 21 nr 3

157-164

Interaction between the chemical reaction and the flowfield within supersonic combustors were experimentally evaluated. By changing the flow pass configuration, both mixing- and reaction-rate-controlling mode were observed. The mode change was associated with the generation of so-called precombustion shock, which enhance the reaction to attain "fast-chemistry condition". This flowfield was modeled with a one-dimensional kinetic code, and effects of the combustor geometry on the shock generation were evaluated.

Criteria for flame holding in H2-fueled scram jet engines

Mitani T.

Archivum Combustionis

2001

Vol. 21 nr 3

165-171

Criteria for flame holding in H2-fueled scram jet engines were discussed by approximating a recirculation zone in combustors with a perfectly-stirred reactor. It was found that the critical reaction time was proportional to P-1.3 for H2 reactions and the recirculation zone should be occupied with reactants of equivalence ratios in 0.4

Measurements of scramjet engine performance by rake probing

Mitani T.

Archivum Combustionis

2000

Vol. 20 nr 1-2

5-11

The combustion performance of scramjet engines was investigated by gas sampling in Mach 4, 6 and 8 flight conditions. Since gas sampling is based on the assumption that the gas compositionis preserved in the sampling process, the critical Damkohler numbers necessary to quench reactions in the gas sampling probes were evaluated using a reduced kinetic model. The analyses using the plane and fullk kinetics showed that reactions in probes can be extinguished if probe Damkohler number is less than about 10. The results were verified by experiments using four kinds of probes with various configurations in a M2,5 supersonic combustor.