Device to reduce turbulent flow skin friction using carbon dioxide, riblets, and suction holes
View Patent ↗A device to reduce turbulent flow skin friction uses carbon dioxide, riblets, and suction holes to reduce the overall drag of a body moving in a fluid. A deflector ( 2 ) pushes up the boundary layer of the incoming flow on a surface ( 1 ). Carbon dioxide is injected into a plenum ( 3 ) and ejected through an exhaust slot ( 4 ). Riblets of specific dimensions ( 5 ) are placed to interact with the carbon dioxide flow that is now the sublayer viscous flow. After passing the riblets, the flow is sucked partly through suction holes ( 6 ), preventing flow separation that could increase the form and wave drag.
1 . An apparatus that is a device to reduce turbulent flow skin friction using carbon dioxide, riblets, and suction holes, the apparatus comprising:
a surface onto which a flow deflector is attached, wherein the flow deflector is placed in front of the riblets;
a plenum located under the surface into which the carbon dioxide is configured to be introduced and connected to an exhaust slot;
the riblets coated with anions that are configured to attract the carbon dioxide and mounted on a thin film with adhesive fixing them on the surface, and with grooves facing a freestream, and placed in front of the exhaust slot;
suction holes are connected to a plenum located under surface; the carbon dioxide is configured to be ejected into the grooves of the riblets and the freestream is deflected on a top of the flow deflector.
2 . The device to reduce turbulent flow skin friction using carbon dioxide, riblets, and suction holes according to claim 1 , wherein the device is configured to be placed on the surface of a fan blade, a rotor blade, an engine nacelle, a rocket surface, a stabilizer surface, an axial compressor blade surface of a gas turbine or a wing surface.
3 . The device to reduce turbulent flow skin friction using carbon dioxide, riblets, and suction holes according to claim 1 , wherein the carbon dioxide is configured to be stored in a tank for being sent into the plenum and for being ejected through the exhaust slot.
4 . The device to reduce turbulent flow skin friction using carbon dioxide, riblets, and suction holes according to claim 1 , wherein carbon dioxide is configured to be captured from an exhaust of a primary core of a jet engine by cooling exhaust gases via a heat exchanger with a phase separator where any remaining carbon dioxide is configured to be liquified by being compressed in a pump and stored in a tank.
5 . The device to reduce turbulent flow skin friction using carbon dioxide, riblets, and suction holes according to claim 1 , wherein the plenum external wall is also the flow deflector.
6 . The device to reduce turbulent flow skin friction using carbon dioxide, riblets, and suction holes according to claim 1 , wherein the plenum, flow deflector, and riblets are all integrated into a flexible material as plastic and can be directly applied on a surface.
7 . The device to reduce turbulent flow skin friction using carbon dioxide, riblets, and suction holes according to claim 1 , wherein the riblets are directly printed on a surface.
8 . The device to reduce turbulent flow skin friction using carbon dioxide, riblets, and suction holes according to claim 1 , wherein the CO2 fluid is substituted with another fluid.