ポッド・プロパルサの単独性能について

概要

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The present paper discusses the open water characteristics of podded propulsors. First of all, The National Maritime Research Institute (NMRI) has newly developed a dynamometer for a podded propulsor. This dynamometer can measure not only propeller thrust, torque and revolution number but also three-component forces; drag, side force, and horizontal torsional moment without frictional torque. Firstly, the resistance test on two types of podded propulsors without a propeller was performed varying with advance speed and surface condition of the strut of a podded propulsor. The open water characteristics of two types of podded propulsors were measured with two or three kinds of propellers respectively. The relation between the equipped propeller forces and the total forces of the podded propulsors was examined and discussed. Secondly, the viscous effects on the resistance of the podded propulsor casing are discussed, comparing the experimental results with the computed ones by one of NMRI CFD program codes and a practical estimation method. Finally, the parametric investigation was made on the effects of gap between the propeller and the fore part of pods, propeller position to the pod and strut, and others on the measurements.
2003-08-31