[특허]Tip vortex generation technology for creating a lift enhancing and drag reducing upwash effect

Tip vortex generation technology for creating a lift enhancing and drag reducing upwash effect 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B64C-003/10 B64C-005/08 B64C-023/06 B64C-009/06
출원번호	US-0276407 (1994-07-18)
발명자 / 주소	McCarthy Peter T. (134 Park St. #5 Buffalo NY 14201)
인용정보	피인용 횟수 : 80 인용 특허 : 0

초록 ▼

Methods for using tip generated vortices to improve performance of foils. These methods include generating a substantially streamwise beneficial vortex (74) near the outboard end (60) of a foil (82). This beneficial vortex (74) spins in the opposite direction of an induced drag vortex (62), and is used to create an upwash field (76) which neutralizes induced drag by deflecting the flow behind the trailing edge (56) at an upward angle. Upwash field (76) causes the lift vector (118) on the foil (82) to tilt forward, thereby creating a forward directed force of induced thrust upon the foil (82). Beneficial vortex (74) is also used to contain and compress the high pressure field existing along the attacking surface of the foil (82), and displace the induced drag vortex (62) inboard from the tip of the foil (82). Numerous performance parameters are improved dramatically by using beneficial vortex (74), as well as by using a double vortex pattern (124). Methods for creating, using, and controlling these vortex patterns are offered along with a variety of embodiments for employing such methods. Described embodiments include a twist (66) along the span of a foil (82b), an anhedral tip droop having a divergent axis of droop curvature (86), a movable vortex flap (102), a cone shaped vortex generator (134), a curved outboard droop (146), and a vortex flap network (162). Methods are also disclosed for reducing overall tip vorticity.

대표청구항 ▼

A method for improving the performance of a foil type device, comprising the steps of: (a) providing relative movement between said foil and a fluid medium, wherein said relative movement occurs in a manner which creates a lifting force on said foil by forming a relative low pressure field within said fluid medium along the low pressure surface of said foil, and by forming a relative high pressure field within said fluid medium along the high pressure surface of said foil, and said lifting force on said foil is substantially directed from said high pressure field toward said low pressure field, and (b) providing a passive vortex generating means substantially near the tip of said foil, wherein said passive vortex generating means is attached with an attachment means to said foil so that said relative movement occurs between said generating means and said fluid medium to create a substantially streamwise vortex within said fluid medium substantially near said tip of said foil, and said passive vortex generating means is oriented relative to said foil in a manner which causes said vortex to spin in a direction which encourages said fluid medium to flow in a substantially inward spanwise direction from said tip toward said high pressure surface in an amount effective to create an increase in pressure within said high pressure field, whereby said increase in pressure substantially increases said lifting force on said foil.

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Tip vortex generation technology for creating a lift enhancing and drag reducing upwash effect 원문보기

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Tip vortex generation technology for creating a lift enhancing and drag reducing upwash effect 원문보기

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