Hydrodynamic Development of Azimuthing Podded Propulsion System〔含 Discussions〕

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  • 舩野 功
    Kawasaki Heavy Industries, Ltd. Machinery Division

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  • Hydrodynamic Development of Azimuthing Podded Propulsion System
  • Hydrodynamic Development of Azimuthing Podded Propulsion System ガン Discussions

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Hydrodynamic development of the azimuthing podded propulsion system is presented. First in process of the development, the geometry of the pod housing and strut has been optimized by means of numerical simulation technique based on computational fluid dynamics (CFD) solving the Navier-Stokes' equations. In the numerical simulation, there are the steady analysis by means of the sink-disc method as effects of a propeller race simply and the quasi-steady analysis in order to investigate accurately hydrodynamic interaction between the full propeller and the pod housing in straight forward condition, that is, non-azimuthing condition. In that time the effects of fins attached the pod were studied. Furthermore the unsteady analysis has been performed in order to investigate exactly effects of the unsteady terms in related equations. Especially the unsteady analysis is essential for investigation of the flow around the podded propulsion system in oblique flow, that is, steering condition. The results of the investigation about the unsteady hydrodynamic forces acting on the whole unit in neutral and oblique rudder angles are shown and discussed in detail. By using these analytical methods, the optimization of the pod and strut was accomplished successfully by compromise with the dimension of the built-in motor as to decrease the drag of the pod housing and strut. Next open water tests and cavitation tests were conducted with the final pod shape. Based on the results of the tank tests, the computed results are verified and basic knowledge concerned with the propulsion performance was obtained. As a result, the author can find that the computed results agree very well with the measured ones and the final geometry of the pod housing and strut has excellent performance.

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