Experimental Investigation of the Sail Position of a Submarine on the Downstream Flow Field

The effect of sail position on the downstream flow field of the sail is investigated in the wind tunnel. A five-hole pressure probe is used to measure the 3D flow field. The investigation of the five-hole results shows that the five-hole measurements can determine the horseshoe vortex structure. Also, the results show that the horseshoe vortexes become smaller by forward moving of the sail on the body to the nose. Therefore, if the sail is mounted on the hull near the bow, the performance of the impeller increases and nose level decreases.