This paper reports experimental measurements of the hydrodynamic forces acting on a low drag submersible. The model was manufactured using standard, cost-effective methods without undue attention paid to the roughness or waviness of the model's surface. It was seen, using flow visualization techniques, that the laminar boundary layer extended over 70 % of the vehicle length; furthermore, no separation of the flow was seen over the remaining 30 % of the body. Hydrodynamic forces were measured, and a significant reduction in drag was found compared with standard turbulent submersible shapes. The low drag performance was quite resilient to changes in incidence, showing a large drag 'bucket' for angles of incidence between plus/minus 4 deg. With the addition of a set of cruciform fins at the rear of the body, incorporating control surfaces, it was found that for a centre of gravity position forward of 41.3 % of the body length, the vehicle would be statically stable both stick-free and stick-fixed. Finally, using a pitot tube wake rake the velocity profile of the boundary layer at the propeller location was found to be that of an attached, turbulent boundary layer closely matching 5.35-1 power law. The importance of full interference measurement tests to allow for the support strut effects is clearly demonstrated.


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    Titel :

    Wind tunnel experiments on a fully appended laminar flow submersible for oceanographic survey


    Weitere Titelangaben:

    Windkanalexperimente zu einer voll ausgebildeten laminaren Umströmung einer tieftauchfähigen unbemannten Kapsel zur Meereserkundung


    Beteiligte:
    Huggins, A. (Autor:in) / Packwood, A.R. (Autor:in)

    Erschienen in:

    Ocean Engineering ; 22 , 2 ; 207-221


    Erscheinungsdatum :

    1995


    Format / Umfang :

    15 Seiten, 16 Bilder, 4 Tabellen, 8 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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