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Numerical Analysis of the Unsteady Propeller Performance in the Ship Wake Modified By Different Wake Improvement Devices

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The paper presents the summary of results of the numerical analysis of the unsteady propeller performance in the non-uniform ship wake modified by the different wake improvement devices. This analysis is performed using the lifting surface program DUNCAN for unsteady propeller analysis. The object of the analysis is a 7000 ton chemical tanker, for which four different types of the wake improvement devices have been designed: two vortex generators, a pre-swirl stator, and a boundary layer alignment device. These produced five different cases of the ship wake structure: the original hull and hull equipped alternatively with four wake improvement devices. Two different propellers were analyzed in these five wake fields, one being the original reference propeller P0 and the other - a specially designed, optimized propeller P3. The analyzed parameters were the pictures of unsteady cavitation on propeller blades, harmonics of pressure pulses generated by the cavitating propellers in the selected points and the fluctuating bearing forces on the propeller shaft. Some of the calculated cavitation phenomena were confronted with the experimental. The objective of the calculations was to demonstrate the differences in the calculated unsteady propeller performance resulting from the application of different wake improvement devices. The analysis and discussion of the results, together with the appropriate conclusions, are included in the paper.
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Bibliogr. 4 poz., rys.
  • Gdańsk University of Technology, 11/12 Narutowicza Street, 80-233 Gdańsk, Poland,
  • 1. Glover E.J., Szantyr J. A.: The Analysis of Unsteady Propeller Cavitation and Hull Surface Pressures for Ducted Propellers, Trans. RINA, Vol. 132, 1990.
  • 2. Szantyr J. A.: User Instructions for the Program DUNCAN2012 for the Analysis of Ducted Propeller Operation in the Non-uniform Velocity Field, Technical Report of CTO SA No RH-2012/T-123 (in Polish), 2012.
  • 3. Di Felice F., Salvatore F., Dymarski P., Pereira F.: Deliverable D21.1 -Results of Model Tests on Reference Configurations. STREAMLINE project Technical report, INSEAN and CTO, 2011.
  • 4. Di Felice F., Falchi M., Aloisio G., Pecoraro A., Salvatore F., Bugalski T.: Deliverable D21.11 –Results of Model Tests on Optimized Configurations. STREAMLINE project Technical report, INSEAN and CTO, 2013.
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