Abstract
Time-dependent, compressible numerical simulations have been performed to study the flowfields in an idealized ramjet consisting of an axisymmetric inlet and a combustor. The simulations indicate strong coupling between the flowfield and the acoustics of both the inlet and the combustor. For the cases studied, forcing at the first longitudinal acoustic mode of the combustor induces vortex rollup near the entrance to the combustor at the forcing frequency. A low-frequency oscillation is also observed in all of the simulations. Pressure fluctuations in the inlet indicate that the low frequency corresponds to a quarter-wave mode in the inlet. Changing the length of the inlet appropriately changes the observed low frequency. The merging pattern of the vortices in the combustor is modified significantly when either the acoustics of the combustor or that of the inlet are changed. These merging patterns are explained on the basis of an interaction between the vortex-rollup frequency and the acoustic modes of the inlet and combustor.
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