초록 ▼

A method and apparatus for reducing the skin friction on objects in relative motion to a field of fluid. The areas of relative low speed motion are fixed to align with a series of ridges on the surface of the object. The areas of low speed motion aligned with the ridges are removed by suction from t

A method and apparatus for reducing the skin friction on objects in relative motion to a field of fluid. The areas of relative low speed motion are fixed to align with a series of ridges on the surface of the object. The areas of low speed motion aligned with the ridges are removed by suction from the turbulent boundary layer which results in a reduction of drag on the object. An alternative embodiment injects fluid into areas of relative high speed between the ridges to reduce the shear and the drag caused by it. Selective suction and injection are combined in one apparatus in a second alternative embodiment. A fourth embodiment injects a polymeric solution to reduce drag. A fifth embodiment heats the fluid in specified areas to reduce drag. A sixth embodiment uses a compliant material in specified areas of the surface in contact with flowing fluid to reduce drag.

대표청구항 ▼

A method for reducing turbulent skin friction of bodies in relative motion to a field of fluid comprising the steps of: locating localized areas of high and low speed flow in the area adjacent to the outside surface of the bodies; and, fixing said areas of low and high speed flow to a given area on

A method for reducing turbulent skin friction of bodies in relative motion to a field of fluid comprising the steps of: locating localized areas of high and low speed flow in the area adjacent to the outside surface of the bodies; and, fixing said areas of low and high speed flow to a given area on the body; and, removing said areas of low and high speed flow.