抄録
The formation of a tip leakage vortex was discussed on the region where roll-up of the vortex occurs. This region is of special interest in a tip leakage vortex cavitation. We attempted to relate the inception cavitation number, σ_i, to the angle of attack, α. It was found that the inception in a tip leakage vortex cavitation should follow the relation, σ/α=const.