[특허]Streamwise variable height riblets for reducing skin friction drag of surfaces

[미국특허] Streamwise variable height riblets for reducing skin friction drag of surfaces 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B64C-023/00
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 friction drag coefficient of the surface by approximately 12% over an identical smooth surface without the riblets. This reduction occurs despite the significant increase in wetted area of the riblet-covered surface over the smooth surface.

대표청구항 ▼

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 lesser height in the z-direction.

이 특허에 인용된 특허 (8) 인용/피인용 타임라인 분석

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Walsh Michael J. (Newport News VA) Anders John B. (Yorktown VA) Hefner Jerry N. (Newport News VA), Combined riblet and lebu drag reduction system.
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Lbert Gerhard (Baldham DEX) Bschorr Oskar (Munich DEX) Spies Hans (Pfaffenhofen DEX), Device for reducing the frictional drag of moving bodies.
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Bechert Dietrich (Berlin DEX), Surface, exhibiting reduced flow resistance, of a body over which turbulent flow takes place.
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[미국특허] Streamwise variable height riblets for reducing skin friction drag of surfaces 원문보기