Determining the loss of efficiency of twin propeller systems in circulation maneuvers
DOI:
https://doi.org/10.33175/mtr.2021.244703Keywords:
Twin screw, Asymmetric efficiency, Manoeuvring, Interaction coefficients, Thrust, TorqueAbstract
Nowadays, a large number of newly-built inland and navy vessels are equipped with a twin propeller-twin rudder configuration (TPTR). Observations of units of TPTR systems when performing maneuvers at curvilinear trajectories show asymmetrical loading. The nature and parameters of the phenomenon have not been sufficiently studied, in which specific maneuvers could lead to overloading and loss of effectiveness. The purpose of this paper is to study the effectiveness of a ship’s TP system in maneuvering, taking into account the influence of the oblique flow to the “internal” and “external” propellers respective to the trajectory of motion. Appropriate maneuvering experiments with a free-running ship model are carried out, by which the propeller thrust and torque are measured. Based on the obtained investigation results, analyses of interaction effects in the TP system are performed. Coefficients for estimating the asymmetric efficiency of the twin-screw system are developed, and related conclusions are summarized.
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