Cavitation is one of the major problems in the development of rocket engines. There have been few
experimental studies to visualize cryogenic foil cavitation. Therefore a new cryogenic cavitation tunnel of
blowdown type was built. The foil shape is "piano-convex". This profile was chosen because of simplicity, but
also of being similar to the one for a rocket inducer impeller. Working fluids were water at room temperature,
hot water and liquid nitrogen. In case of Angle of Attack (AOA)=8 °, periodical cavity departure was observed
in the experiments of both water at 90°C and nitrogen at -190°C under the same velocity 10 m/sec and the
same cavitation number 0.7. The frequencies were observed to be 110 and 90 Hz, respectively, and almost
coincided with those of vortex shedding from the foil. Temperature depression due to the thermodynamic effect
was confirmed in both experiment and simulation especially in the cryogenic cavitation.
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