Cavitation-induced flow vibration of liquid oxygen pumps for rockets.

It is common for turbopumps of rockets to be operated in low NPSH conditions. Therefore, oscillation of propellant feed systems associated with cavitation is often encountered. If this oscillation is coupled with the structure of a rocket, longitudinal vibration referred to as "POGO" occurs. Regarding cavitating inducer instabilities, many studies have been conducted. However, it seems that studies of cavitating centrifugal pumps with an inducer for cryogenic fluids are few. In the present study, one aspect of the unsteady and dynamic characteristics of liquid oxygen centrifugal pumps was examined using power spectral methods.