The oxygen pump constitutes a crucial and intricate component within liquid rocket engines, serving as a primary source of engine vibration. This study delves into the unsteady fluid-induced excitation loading, considering the interplay between gap flow and main flow. The findings are validated through testing on a liquid rocket engine. Modal characteristics of the oxygen pump under varying liquid mediums are examined. The Rayleigh damping parameter is determined, accounting for the frequency characteristics of fluid-induced excitation, thereby establishing a comprehensive transient dynamic model. Subsequently, the transient dynamic response of the volute in an oxygen pump to unsteady fluid-induced excitation is analyzed, unveiling both time-domain and frequency-domain vibration response characteristics. The analysis methodology is corroborated through comparison with the statistical distribution of test results. Notably, the vibration response of the oxygen pump volute predominantly exhibits frequency doubling of rotational speed, with prominent occurrences observed at the 12X and 18X frequencies.
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