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• W4366269310 endingPage "2590" @default.
• W4366269310 startingPage "2581" @default.
• W4366269310 abstract "Injection coupling is a well-known cause of high-frequency combustion instability in hydrogen/liquid oxygen ([Formula: see text]) rocket engines. This type of instability is commonly explained by the two-way coupling between the dynamics of the combustion chamber and the injection system. Recent experimental studies of the BKD combustor, however, suggest that the LOX injector could be self-excited and driving the acoustic mode of the combustion chamber. To assess the feasibility of this mechanism, here, we study both experimentally and theoretically the acoustic stability of the LOX injector isolated from the combustion chamber. The experimental study was performed in a water facility mimicking the conditions of a single LOX injector. The water injector was then modeled using an acoustic network analysis, where the transfer matrix of the LOX injector inlet orifice was computed numerically using a linear approach. The analysis successfully predicts the experimental peak in unsteady pressure, revealing that the LOX injector can be self-excited. The instability was found to be driven by the whistling of the orifice at the inlet of the injector coupled with the second longitudinal acoustic mode of the LOX post tube." @default.
• W4366269310 created "2023-04-20" @default.
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• W4366269310 date "2023-05-01" @default.
• W4366269310 modified "2023-10-18" @default.
• W4366269310 title "Injection-Coupling Instabilities in the BKD Combustor: Acoustic Analysis of the Isolated Injectors" @default.
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• W4366269310 doi "https://doi.org/10.2514/1.j062507" @default.
• W4366269310 hasPublicationYear "2023" @default.
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