Experimental investigation of the flow structure formed around different torpedo-like models under uniform flow conditions

In his study, the flow characteristics around three different torpedo-like geometries with spherical nose-wingless stern, spherical nose 3-winged stern and spherical nose 4-winged stern placed in uniform flow conditions were experimentally investigated using the Particle Image Velocimetry (PIV) Measurement system. Experiments were performed for angles of attack α=0ᵒ, α=4ᵒ, α=8ᵒ and α=12ᵒ at Re=20000 and Re=40000 values. As a result of the experiments; instantaneous velocity vector field V change, instantaneous vorticity contours ɷL/U_∞ change, velocity component contours in the average current direction () change, velocity component contours perpendicular to the average current direction () change, average velocity vector field change, average streamlines <Ψ> change, average vorticity contours (<ωL)⁄U_∞ > change, velocity component in the average flow direction turbulent swirl contours () change, velocity component turbulent swash contours perpendicular to the average flow direction () change and average nondimensionalized turbulent kinetic energy contours () variation is obtained. In the findings, it was concluded that turbulence characteristics play a dominant role in the wake with increasing angle of attack and Reynolds number, but the use of the winged tail model significantly suppresses turbulent oscillations in the wake of the torpedo-like geometry.