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Item type:Publication, Access status: with files , Design exploration study with counter-rotating propellers for a zeroemission coaster vessel(Norwegian University of Science and Technology, Department of Marine Technology, 2024-04-04)This paper describes a simulation driven approach to the design of a shaft counter-rotating propeller (CRP) system for the next generation coaster vessel. The design workflow involves parametric CAD models of ship hull, propellers and rudder, and numerical tools of different fidelity levels which are employed in exploration studies, iterative elaboration of propeller design and final verification of ship's propulsion performance. It is demonstrated that, in the present case, with a wakeadapted CRP design one can achieve a power reduction of 8.5 to 9.0 % compared to the solution with a single propeller designed for the same conditions. In addition to propulsion characteristics, the paper also presents the analysis of unsteady loads on propeller blades and rudder, propeller-induced pressure pulses on the hull and radiated noise level, comparing the mentioned quantities between the CRP and single propeller designs.Publicationtype: Conference Paper20 33 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Numerical and experimental study of a series of contrarotating propellers(Norwegian University of Science and Technology, Department of Marine Technology, 2024-04-04); ; ; ; The authors conducted development and analyses of a new series of contrarotating propellers (CRP) as part of a research project funded partly by the Norwegian Research Council and led by the propeller manufacturer Brunvoll. The paper describes the initial investigation for choosing the design matrix, method used for the design of the propeller geometries, potential and CFD based numerical analyses, and open water as well as cavitation model experimental investigations. The main idea behind this new series is to utilize the capability that rate of revolution of the fore and aft propellers can be adjusted independently providing more operational flexibility and better overall efficiency over a wide range of operational conditions. Initial designs were performed using a numerical tool based on potential flow; however, some designs were refined based on analyses performed using CFD. A set of propellers were tested both at SINTEF Ocean and SVA Potsdam. The paper presents the methodology used for the design as well as numerical and experimental investigation of this series. Results are provided graphically. Comparison between results from different numerical methods and the model tests are shown and possible deviations are discussed.Publicationtype: Conference Paper44 48