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특허 상세정보

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내보내기 페이스북 공유 카카오톡 공유

Streamwise variable height riblets for reducing skin friction drag of surfaces

특허상세정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) B64C-023/00   
미국특허분류(USC) 244/200; 244/130; 244/199
출원번호 US-0548970 (2000-04-13)
발명자 / 주소
  • Paul D. McClure
출원인 / 주소
  • Lockheed Martin Corporation
대리인 / 주소
    Bracewell & Patterson, L.L.P.
인용정보 피인용 횟수 : 44  인용 특허 : 8
초록
▼

A series of parallel riblets extend from a smooth, aerodynamic surface for reducing the skin friction drag of the surface an airstream flows around it. The riblets extend longitudinally along the surface and have a triangular cross-section in the transverse direction. The apex of the cross-section defines a continuous, undulated ridge with peaks and valleys. Measured from the surface, the peaks have a greater height than the valleys. The interaction of the riblets with the structure of the turbulent boundary layer of the airstream reduces the skin fricti...

대표
청구항
▼

1. An apparatus for reducing skin friction drag on a surface, the apparatus comprising:a plurality of parallel riblets wherein, in a Cartesian coordinate system with x, y, and z-axes, each of the riblets extends lengthwise in an x-direction and has a longitudinal profile in an x-z-plane with a variable height in a z-direction, and wherein the riblets are adapted to be mounted to a surface that is subjected to fluid flow in the substantially x-direction; and wherein each of the riblets has a plurality of peaks in the x-z plane separated by valleys of less...

이 특허에 인용된 특허 (8)

  1. Loebert Gerhard (Baldham DEX), Apparatus for reducing turbulent drag.
  2. Savill Anthony M. (Cambridge GB2), Boundary layer devices.
  3. Savill Anthony M. (Cambridge GB2), Boundary layer devices.
  4. Grose Ronald D. (Omaha NE), Cascaded micro-groove aerodynamic drag reducer.
  5. Grose Ronald D. (61 Hwy. 211 Newport WA 99156), Cascaded turbulence generation inhibitor.
  6. Walsh Michael J. (Newport News VA) Anders John B. (Yorktown VA) Hefner Jerry N. (Newport News VA), Combined riblet and lebu drag reduction system.
  7. Lbert Gerhard (Baldham DEX) Bschorr Oskar (Munich DEX) Spies Hans (Pfaffenhofen DEX), Device for reducing the frictional drag of moving bodies.
  8. Bechert Dietrich (Berlin DEX), Surface, exhibiting reduced flow resistance, of a body over which turbulent flow takes place.

이 특허를 인용한 특허 (44)

  1. Song, Weidong, Actuatable microstructures and methods of making the same.
  2. Williams, Timothy Leroy; Rawlings, Diane C., Aerodynamic microstructures having sub-microstructures.
  3. Schmidt, Eric Thomas, Aerodynamically efficient surfaces.
  4. Schmidt, Eric Thomas, Aerodynamically efficient surfaces.
  5. Brennan, Susan Elizabeth; French, Clive; Clark, James Dudley, Aircraft refuel system piping.
  6. Wright, Philip; Kay, Edmund, Aircraft wing with slotted high lift system.
  7. Rawlings, Diane C.; Christensen, Stephen, Amorphous metal riblets.
  8. Rawlings, Diane C.; Christensen, Stephen, Amorphous metal riblets.
  9. Jordan, Stephen A., Apparatus for controlling pressure recovery.
  10. Kray, Nicholas Joseph; Breeze-Stringfellow, Andrew, Apparatus to apply a variable surface texture on an airfoil.
  11. Kallinen,Risto, Arrangement for generating vortexes.
  12. Cordier, Stephane; Briancon-Marjollet, Laurence, Bearing structure with reduced tip vortex.
  13. Rawlings, Diane C., Color applications for aerodynamic microstructures.
  14. Jabado, Rene; Jensen, Jens Dahl; Krüger, Ursus; Körtvelyessy, Daniel; Reiche, Ralph; Rindler, Michael, Component to be arranged in the flow channel of a turbomachine and spraying method for producing the coating.
  15. Nicholson, Lee M.; Given, Peter S.; Joshi, Prasad V.; Liu, Wei; Lefebvre, Denise H.; Jankowiak, Marcin, Control of bubble size in a carbonated liquid.
  16. Riggins, David W., Drag reduction utilizing driven micro-cavities.
  17. Berschback, Casey Lauren; Wood, Trevor Howard; Lin, Wendy Wenling; Liou, Lara, Durable riblets for engine environment.
  18. Rawlings, Diane C.; Burg, Jr., Alan G., Elastomeric riblets.
  19. Kao, Alan Lin; Robinson, Lance Travis; Chilcoat, David Wayne, High efficiency impeller.
  20. Hagseth, Paul E.; McClure, Paul D., Inlet electromagnetic flow control.
  21. Lang,Thomas G.; Lang,James T., Low drag ship hull.
  22. Lang, Thomas G.; Lang, James T., Low-drag hydrodynamic surfaces.
  23. Li, Ming; Marinelli, James M.; Liu, Jiantao; Magnusen, Paul E.; Sheu, Simon; Heinimann, Markus B.; Liu, John; Vega, Luis Fanor, Metal sheets and plates having friction-reducing textured surfaces and methods of manufacturing same.
  24. Li, Ming; Marinelli, James M.; Liu, Jiantao; Magnusen, Paul E.; Sheu, Simon; Heinimann, Markus B.; Liu, John; Vega, Luis Fanor, Metal sheets and plates having friction-reducing textured surfaces and methods of manufacturing same.
  25. Segota,Darko; Finnegan, II,John W., Method and system for regulating external fluid flow over an object's surface, and particularly a wing and diffuser.
  26. Lang, Amy W., Micro-array surface for passive drag modification.
  27. Rawlings, Diane C.; Keough, Bruce K.; Olli, Larry K.; Burg, Alan G.; Kestner, James M.; Granger, George Michael; McGarvey, James Charles, Multilayer riblet applique and methods of producing the same.
  28. Rawlings, Diane C.; Williams, Timothy Leroy; McGarvey, James C.; Kestner, James M.; Burg, Alan G., Optical effects for aerodynamic microstructures.
  29. McClure, Paul D.; Chase, Charles J., Over-wing traveling-wave axial flow plasma accelerator.
  30. Frankenberger, Eckart; Bergemann, Thorsten; Naeve, Heinz-Detlef, Painting device, painting arrangement, method for painting a curved surface of an object, and use of an inkjet device for painting an aircraft.
  31. Lang, Amy Warncke, Passive micro-roughness array for drag modification.
  32. McClure, Paul D.; Macheret, Sergey; Smith, Brian R.; Chankaya, Kurt M., Plasma enhanced riblet.
  33. Rawlings, Diane C.; Roe, George M.; Keller, Peter C., Reduced solar absorptivity applique.
  34. Wobben, Aloys, Reduction in the noise produced by a rotor blade of a wind turbine.
  35. Wobben,Aloys, Reduction in the noise produced by a rotor blade of a wind turbine.
  36. Rawlings, Diane C.; Malone, Kevin R., Rigid tipped riblets.
  37. Bonnet, Laurent, Rotor blade for a wind turbine having aerodynamic feature elements.
  38. Alfano, David, Rotorcraft structural element for reducing aerodynamic drag.
  39. Rawlings, Diane C.; Schneider, Terry L., Shape memory riblets.
  40. Krohmer,Christoph; Lorenz,Hans; Brand,Norbert, Solid body with microstructured surface.
  41. Koide, Brad Jiro; Myrman, Marshall Corey, Transportable inflatable surfing apparatus and method.
  42. van Merkstoijn, Jacobus Lambertus, Turbulence foil.
  43. Reisenhofer, Eric, Underbody panelling.
  44. Sullivan, John; Sullivan, Collin Robert, Wavy airfoil.

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