Abstract
The acoustic behavior of a dump combustor operating at very low Mach numbers is explored experimentally and analytically. Two dominant acoustic modes are identified that strongly influence the combustion process in the device: (1) a low-frequency “chugging” mode that is associated with relatively low equivalence ratios (< 0.7) and large combustor cavity lengths, and (2) a high-frequency mode and harmonics that are associated with periodic vortex shedding at the dump plane and with equivalence ratios above 0.8. These acoustic modes can be made resonant by adjusting the stoichiometry, combustor cavity length, plenum length, and flow rate. A transient, one-dimensional model successfully predicts the possible acoustic modes associated with the device and, through determination of perturbation pressure and velocity distributions, indicates the sensitivities of the oscillations. Introduction of an oscillatory volume source at the dump plane allows rough estimation of the dominant modes.
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