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Description
The dynamic cavitation characteristics of liquid nitrogen flow over a three dimensional hydrofoil are experimentally investigated in a variable pressure ratio tunnel. The temperature and pressure in the cavity as well as the flow rate are synchronously measured, together with the visual observation of the cavitation unsteady behaviors using the high-speed camera. Cavitation evolutions in a period are captured at different ratio of inlet to outlet pressure. The analyses on measured dynamic pressure data and images reveal that the shedding frequency and length of cavitation cloud linearly increases while the pressure amplitude exponentially increases as the pressure ratio increases. The time-averaged temperature distributions along the hydrofoil surface are presented and analyzed at different pressure ratio. The initial cavitation development and characteristics are also investigated.