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.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

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


    Additional title:

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


    Contributors:

    Published in:

    Ocean Engineering ; 22 , 2 ; 207-221


    Publication date :

    1995


    Size :

    15 Seiten, 16 Bilder, 4 Tabellen, 8 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Laminar-Flow Wind Tunnel Experiments

    W. D. Harvey / C. D. Harris / W. G. Sewall et al. | NTIS | 1989


    Laminar-flow wind tunnel experiments

    Harvey, William D. / Harris, Charles D. / Sewall, William G. et al. | NTRS | 1989


    Laminar-flow instrumentation for wind-tunnel and flight experiments

    NITSCHE, WOLFGANG / SZODRUCH, JOACHIM | AIAA | 1993



    Natural laminar flow data from full-scale flight and wind-tunnel experiments

    Holmes, B. J. / Coy, P. F. / Yip, L. P. et al. | NTRS | 1981