Abstract
Internal flow of a cryogenic rocket turbopump is rather complicated compared to ordinary pumps. In order to design stable axial thrust balancing system, dynamic analyses of the internal flow system is essential. In the present study, analysis program to analyze dynamic characteristics of leakage flow through the axial thrust balancing system was developed. In the program, structure of the balance piston type axial thrust balancing system and the internal flow passages are combined. Pressure perturbation was imposed on the inlet of the balancing system and the dynamic response of the axial thrust balancing system was evaluated. Calculated results showed that the system has resonant frequencies which depend on the fluids and the other parameters of the system.
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