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Abstract
This paper presents a comparison between different types of propellers operated in calm water to evaluate their performance behind hulls and in open-water conditions. A bulk carrier is chosen as a case study to perform the simulation and to evaluate the performance of several propeller series, namely the Wagengein B-series, Kaplan 19A, and MAU. Firstly, optimization procedures are performed by coupling a propeller design tool and a nonlinear optimizer to find the optimum design parameters of a fixed-pitch propeller. This optimization model aims to design the propeller behind the hull at the engine operating point with minimum fuel consumption and maximum propeller efficiency. The two main objectives of this study and the constraints are defined in a single fitness function to find the optimum values of the propeller geometry and the gearbox ratio. By considering the benefits of the single-objective over the multi-objective optimization problem, this model helps to find the optimum propeller for both defined objectives instead of only considering one of them, as in previous studies. Then, based on the optimized parameters, the propeller performance is calculated in open-water conditions. From the computed results, one can observe the importance of considering the hull–propulsor interaction in propeller selection.
Highlights
Based on the developed propeller optimization model in the Matlab environment, the nonlinear optimizer is able to select the propeller geometry, the propeller operating point, and the gearbox ratio of a propulsion system of a bulk carrier driven by an fixed-pitch propeller (FPP) at a service speed (14.5 knots)
The propeller parameters are optimized behind the ship hull, based on the computed parameters, the propeller performance is simulated in open-water conditions for comparison
This paper presents a developed model coupling NavCad and Matlab to select an optimum propeller by maximizing the propeller efficiency and minimizing the fuel consumed for a given speed and number of blades, instead of only considering one of the two objectives
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The numerical model developed by [31] is adapted to extend the previous works mentioned in the literature review, by optimizing the propeller geometry as well as the operational point at both the maximum propeller efficiency and minimum engine fuel consumption for a given ship speed, in order to ensure maximum propeller performance. It follows the same concept of design presented by Chen and Shih [30] that used several objectives combined into one single equation.
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