An experimental apparatus was developed to visualize a rotating inducer with speeds of 0 to 8000 rpm. The transparent casing outside the inducer was made of quartz glass, so that tip clearance remained almost constant. All other key parts were chosen based on their suitability for both cryogen and water. Backflow vortex cavitation on a rotating inducer was observed in either liquid nitrogen or water. Consequently, the orbital rotational rate, the orbital rotational diameter, and the diameter of each backflow vortex cavitation should be sorted by head coefficient. Further, thermodynamic effects were observed for the diameter of each backflow vortex cavitation.
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