Low drag underwater vehicle utilizing boundary layer suction

摘要

A low drag underwater vehicle utilizing boundary layer suction is provided wherein the vehicle includes a hull having nose, mid and tail sections. A permeable shell is mounted in a spaced relationship about the hull so that ambient water can be drawn into the space therebetween. The space between the permeable shell and the hull is divided into nose, mid and tail compartments. A pump is provided. Separate passageways are provided for connecting the nose and tail compartments to the pump and for connecting the mid compartment to the pump. The pump is capable of pumping the nose and tail compartments at a greater rate per unit area of permeable shell than the mid compartment. With this arrangement boundary layer suction through the permeable shell is greater at the nose and tail portions of the underwater vehicle than at the mid portion where the tendency toward turbulence is not as severe.