The AO-177, first of a new class of Naval Auxiliary Oilers, experienced high levels of inboard airborne noise and initial-stage erosion damage on its skewed, seven-bladed propeller during builder's trails. This report describes the problems, corrective design modifications considered, and procedures and rationale used to develop a successful corrective design modification consisting of a fin to improve the flow into the propeller. To evaluate the problem, extensive model experiments were conducted, including flow visualization, wake survey, powering experiments, and a crucial series of cavitation experiments including propeller-induced hull pressure measurements in a large water tunnel. Experiments with two fin designs showed the superiority of a flow-accelerating configuration. Other experiments showed some benefits of altering the propeller blade shape. Propeller analyses were undertaken to provide design alternatives for retrofitting the ship with a new propeller. A full-scale trail with the final fin design provided evidence or reduction of the highest levels of airborne noise, reduction in the initial-stage erosion damage, and minimal effect on ship speed. The result is that the AO-177 has been accepted by the fleet for normal service. (Author)


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    Titel :

    Causes and Corrections for Propeller-Excited Airborne Noise on a Naval Auxiliary Oiler


    Beteiligte:
    M. B. Wilson (Autor:in) / D. N. McCallum (Autor:in) / R. J. Boswell (Autor:in) / D. D. Bernhard (Autor:in) / A. B. Chase (Autor:in)

    Erscheinungsdatum :

    1983


    Format / Umfang :

    59 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch