[특허]Flexible tailored elastic airfoil section

[미국특허] Flexible tailored elastic airfoil section 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B64C-003/52
출원번호	US-0650472 (1991-02-04)
발명자 / 주소	Widnall Sheila E. (Lexington MA) Widnall William S. (Lexington MA) Gorgen William E. (Wayzata MN) Evernham Jeffrey T. (Carmel IN)
출원인 / 주소	Flex Foil Technology, Inc. (Lexington MA 02)
인용정보	피인용 횟수 : 46 인용 특허 : 0

초록 ▼

A flexible airfoil section for a wing or a blade comprising a streamlined shape and an elastic structure whose stiffness distribution along its chord and span is tailored to provide a desirable cambered shape with proportional increases in camber with increases in lift, mounted to a supporting structure such that the airfoil sections are free to pivot about axes near their leading and trailing edges. In operation, the foil derives much of its lift from elastic bending deformation of its flexible shape, thereby achieving a higher lift than a symmetric foil at the same angle of attack while postponing the onset of flow separation and stall and, for operation in water, of ventilation and cavitation. A wing or blade of general planform comprising flexible elastic airfoil sections which can be used to stabilize, or to control the direction of travel of, as well as provide side force for, a watercraft such as a sailboat or a sailboard, or for application to a variety of aircraft components and configurations to provide lift and side force and as well can serve as the aerodynamic surfaces of various types of fluid machinery including fans, helicopter rotors and wind turbines operating in subsonic flow.

대표청구항 ▼

A flexible elastic airfoil for generating lift as a result of cambered deflection under load in a moving fluid medium, mounted on a support structure attached to an apparatus operating in contact with a moving fluid medium, said flexible airfoil assembly comprising a) a flexible elastic airfoil section having a leading edge, a trailing edge, a chord c and an exterior profile of a general continuous streamlined shape such that adjacent points on said exterior surface remain in contact as the airfoil deflects in camber, the airfoil being generally made of flexible materials, b) means for pivotably mounting the airfoil near its leading edge forming a leading edge pivot axis, said leading edge pivot axis mounting means attached to the support structure, said leading edge pivot axis mounting means constructed and arranged for passive rotation about the pivot axis the leading edge pivot axis being located a distance in the chordwise direction from the leading edge of the airfoil not exceeding 0.25 of the chord c of the airfoil, c) means for pivotably mounting the airfoil near its trailing edge forming a trailing edge pivot axis, said trailing edge pivot axis mounting means attached to the support structure, said trailing edge pivot axis mounting means constructed and arranged for passive rotation about the pivot axis the trailing edge pivot axis being located a distance in the chordwise direction from the leading edge of the airfoil of at least 0.6 of the chord c of the airfoil, with the distance between the leading edge pivot axis and the trailing edge pivot axis being at least 0.6 c, d) means to permit the airfoil section to slide in a direction generally aligned with its undeformed centerline to permit proportional cambered deflection of the airfoil under load, the sliding means incorporated into one or both of the pivot axis mounting means.

이 특허를 인용한 특허 (46) 인용/피인용 타임라인 분석

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[미국특허] Flexible tailored elastic airfoil section 원문보기

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