Nominal vs. Effective Wake Fields and their Influence on Propeller Cavitation Performance

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Abstract

Propeller designers often need to base their design on thenominal model scale wake distribution, because the effectivefull scale distribution is not available. The effects of suchincomplete design data on cavitation performance is examinedin this paper. The behind-ship cavitation performanceof two propellers is evaluated, where the cases consideredinclude propellers operating in the nominal model and fullscale wake distributions and in the effective wake distribution,also in model and full scale. The method for theanalyses is a combination of RANS for the ship hull anda panel method for the propeller flow, with a coupling ofthe two for the interaction of ship and propeller flows. Theeffect on sheet cavitation due to the different wake distributionsis examined for a typical full-form ship. Results showconsiderable differences in cavitation extent, volume, andhull pressure pulses.
Original languageEnglish
Title of host publicationProceedings of the Fifth International Symposium on Marine Propulsors - smp'17
PublisherVTT Technical Research Centre of Finland
Publication date2017
Pages331-337
ISBN (Print)978-951-38-8606-6, 978-951-38-8607-3, 978-951-38-8608-0
Publication statusPublished - 2017
EventFifth International Symposium on Marine Propulsors - Helsinki, Finland
Duration: 12 Jun 201715 Jun 2017

Conference

ConferenceFifth International Symposium on Marine Propulsors
CountryFinland
CityHelsinki
Period12/06/201715/06/2017

Keywords

  • Propeller Cavitation
  • Wake Scaling
  • Effective Wake
  • RANSBEM Coupling

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