Constricted hydrodynamic flow due to proximate ice blockage over a blade profile in two dimensions

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TypeArticle
Conference2nd International Symposium on Propeller and Cavitation, Hangzhou, China, 1992
Subjectpropeller/ice interaction; non-contact phenomena; ice blockage; proximity condition
AbstractWhen the propeller blades pass the ice blocks with virtually very little clearance, high blade-load impulses and subsequently high peak loads do occur. This was first observed during a full-scale trial (1984) of MV Robert LeMeur, and later verified by the model tests conducted at NRC/IMD ice tank. A two-dimensional model with time dependence is used to study dominant features of this phenomenon. The hydrodynamic flow over a blade profile is considered to be constricted by an ice block at proximity condition. The numerical results indicate a peak load about 5.78 times that computed for open water. The associated flow phenomena have been studied in detail, and a peculiar pressure hump due to throttling effect of the rear corner of ice block was discovered . The moment ditch appearing in the distribution of pitching moment is caused by this pressure hump.
Publication date
AffiliationNRC Institute for Ocean Technology; National Research Council Canada
Peer reviewedNo
IdentifierIR-1992-20
NRC number5620
NPARC number8895298
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Record identifierf77fec4b-4046-44f8-ac52-6d8900f4b808
Record created2009-04-22
Record modified2016-05-09
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