On the Form Resistance of Submerged Bodies : Part3

Abstract

Resistance tests are carried out on several submerged doubld models to investigate the effect of secondary flow on their form resistance. One of the models, the parent form model, has similar sectional form to SR 41 model and the others have Lewis form section so chosen by Bessho's theory that the energy of secondary flow around the model section, T_2, is minimum on the condition of flat keel line and T_2 is zero when there is no condition on keel line. The result shows that the form factor of the model of which T_2 is minimum is less than that of the parent form model and is the least of which T_2 is zero, as Bessho suggested.