Numerical Investigation of Multi-Component Podded Propulsor Performance in Straight Flow

Antonio Sanchez Caja, Timo Rauti, Karl Ramstedt, Tuomas Sipilä

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    The notion of high efficiency related to a low loaded propeller has been sometimes misunderstood in the context of multi-component tandem or CRP units. Individual low loaded propellers working as a part of a multi-stage propulsion unit do not lead necessarily to high efficiency since high efficiency is more related to what could be called low “propulsive” loading, than to what is usually referred to as low “propeller” loading. In this paper, multi-component propulsors are numerically investigated in straight flow from the standpoint of efficiency and propeller interaction. Potential flow tools are used to illustrate the ability of different multicomponent configurations to improve efficiency. RANS methods coupled to actuator disk models are used first to validate average loads on a CRP unit and then to analyze effective wakes in a podded propulsor with three co-axial propeller components.
    Original languageEnglish
    Title of host publicationProceedings of the Fifth International Symposium on Marine Propulsors - smp'17
    PublisherVTT Technical Research Centre of Finland
    Number of pages9
    ISBN (Print)978-951-38-8608-0
    Publication statusPublished - 2017
    MoE publication typeA4 Article in a conference publication
    Event5th International Symposium on Marine Propulsors, smp'17 - Espoo, Finland
    Duration: 12 Jun 201715 Jun 2017


    Conference5th International Symposium on Marine Propulsors, smp'17
    Abbreviated titlesmp '17


    • efficiency
    • contra rotating propellers (CRP)
    • multi component propellers
    • actuator disk
    • effective wake

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