Abstract
A two-inlet, side dump ramjet combustor configuration was tested in a connected-pipe setup using uncooled and uninsulated chamber walls. High amplitude combustion induced pressure oscillations were observed during most test conditions with a predominant frequency of around 300 Hz. Special efforts were made to relate the oscillations to longitudinal acoustic modes. A simplified no flow, uniform temperature acoustic cavity prediction method (NASTRAN) was utilized to model the longitudinal acoustic modes. This model was verified via room temperature laboratory tests using the actual test hardware and a loudspeaker as an input forcing function to excite the acoustic modes. During combustion tests, the measured oscillation modes were tentatively identified as second or third longitudinal modes or a bulk mode, depending on the test conditions.
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