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- W2070984227 abstract "The influence of geometric and flow variables on combustion instability in confined flames stabilized behind a disk is examined. Flammability and stability limits are established as a function of upstream and downstream lengths for ducts with and without exit nozzles. The upstream flow conditions were either uniform premixed flow or a premixed main flow with annular bypass airflow. Combustion was smooth for unconstricted downstream ducts shorter than five diameters, and ducts with nozzle exits shorter than one diameter. Constriction of the exit favored rough combustion but with lower amplitude oscillations. With moderate downstream lengths, oscillations were associated with the longitudinal quarter-wave frequency of the upstream duct between 150 Hz and 200 Hz. Rough combustion was not observed with short upstream ducts that have quarter-wave frequencies much higher than the maximum value of the dominant frequency. In longer downstream ducts with nozzles, the acoustic frequency gave way to lower frequencies not associated with any known acoustic frequency of the combustor. The geometry with bypass flow was more prone to rough combustion and to transition to low-frequency oscillations at shorter downstream lengths." @default.
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- W2070984227 date "1989-01-01" @default.
- W2070984227 modified "2023-10-16" @default.
- W2070984227 title "Acoustic characterization relevant to gas turbine augmentors" @default.
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- W2070984227 doi "https://doi.org/10.2514/3.23122" @default.
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