Study on Instability of Densified Subcooled Liquid Oxygen Cavitating Flows

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Cryogenic rocket propellants such as liquid oxygen can be easily densified by subcooling, i. e., a reduction in fluid temperature below the normal boiling point. An investigation of subcooled liquid oxygen cavitating flow passing through an orifice was carried out to clarify influences of dissolved bubble nuclei on thermodynamic effects of cavitation. The results showed that the bubble growth ratio drastically increases in the subcooled condition and that helium bubble nuclei in the subcooled liquid oxygen promote to suppress the bubble growth. This fact was found to affect the instability of subcooled liquid oxygen cavitating flow.