A research program designed to investigate the effect ofthe fractionation of a foil on tip vortex cavitation has beenconducted. It encompassed the performance of experimentswith parent and fractionated wings in a cavitation tunnel, andnumerical computation of the foil characteristics using acommercially available CFD code. The code give lift andpressure coefficients very close to those obtainedexperimentally. Moreover, it showed that the fractionationdoes not affect significantly the pressure distribution in theregion near the tip. This is confirmed by the fact that theinception critical cavitation number of the fractionated foils,divided by the Reynolds number of the parent foil to thepower 0.4, as a function of the square of the lift coefficient ofthe parent foils, correlates very satisfactorily the resultsobtained with a parent foil.
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