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- W2274666115 abstract "At SSPA model tests are evaluated and scaled to full scale using the ITTC 78 performaceprediction method. The ITTC 78 method has been validated against the sea trials overmore than 35 years and is very adapted to the conventional propellers. However, newtype of propellers such as Kappel propeller seem to challenge the traditional method, inparticular with wake scaling. Suspicions have been raised that the standard methods forevaluation of the model tests might give misleading results for Kappel propeller [1]. Thisreport presents a comparative study in various aspects of the performance of a conventionalpropeller with an unconventional propeller (Kappel propeller). The study is carriedout using OpenFOAM RANS solver for computing the viscous flow around a ship hull,propellers in open-water and propellers behind the hull. The numerical results are validatedby comparing with the model scale experiments performed at SSPA. Further thecomputations are extended to full scale and the sources of scaling effects are identified.The differences in scaling between the conventional and unconventional propellers are examinedand further this relative differences are compared with that of ITTC 78 scalingmethod.The correlation of CFD results with the experimental study justify the accuracy of theCFD setup in predicting the complex flow between hull and propeller. In full scale theCFD results show a larger Reynolds scaling effect on the unconventional propeller comparedwith the conventional propeller in open-water condition. The scaling effects onvarious full scale performance factors such as the effective wake fraction, thrust deduction,hull and total efficiencies are evaluated for the propellers behind the hull using CFD andcompared with the full scale estimations from ITTC 78 method. At the design conditionthe CFD study estimates the unconventional propeller has much lower effective wake andhull efficiency. However the propeller and total efficiencies are higher for unconventionalpropeller. The CFD estimations in full scale contradict the estimations from the ITTC78 method. In this current report the differences between CFD (RANS) and ITTC 78method are presented and the areas of further research are identified in order to uncoverthe other discrepancies." @default.
- W2274666115 created "2016-06-24" @default.
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- W2274666115 date "2016-01-01" @default.
- W2274666115 modified "2023-09-26" @default.
- W2274666115 title "Investigation of Effective Wake Scaling for Unconventional Propellers" @default.
- W2274666115 hasPublicationYear "2016" @default.
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