The prediction of cavitation and its behaviour on ship propellers is generally derived from cavitation observations at model scale. Correlation between the predictions and full scale cavitation has been carried out only indirectly through the effects of cavitation, such as bad experiences with erosion, noise and vibrations. From the correlation between cavitation observations at model scale and (bad) experiences at full scale a few guidelines emerged about the desired behaviour of cavitation at model scale. Such guidelines were e.g. that pressure side cavitation and bubble cavitation are erosive. These types of cavitation were therefore avoided in the design of the propeller. Characteristics of traditional and new blade sections are reviewed. The traditional guidelines about cavitation are critically reviewed on the basis of full scale observations. Laminar boundary layer flow at full scale seems possible as a tool to delay inception. Bubble cavitation seems less erosive than assumed. Cloud cavitation seems to be generated by the cavity contour rather than by unsteady behavior. These considerations open new possibilities for control of erosion.
Cavitation and new blade sections
Neue Blattsektionen zur Kavitationsvermeidung
1994
8 Seiten, 19 Bilder, 6 Quellen
Conference paper
English
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