Abstract
A flow oscillation phenomenon of the dual-bell nozzle at low-altitude operationmode is investigated with cold-flow experiments and numerical simulations. Results indicate the existence of three kinds of periodic flow oscillation modes: a symmetric lowest-frequency oscillation mode, which is an acoustic resonance in the axial direction in an extensionpart of thenozzle, and twohigh-frequencymodes lateral to thenozzle axis originatingdue to vortex shedding andacoustic resonance in the extension nozzle cross section.These periodicflowoscillations are characteristic to dualbell nozzles, and the extension part is the cause of these fluctuations, which are not observed in single-bell nozzles.
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