Surface flow diverting and static charging ducted pores on wing or blade tip to reduce wake and BVI noise
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B64C-023/06
B64C-023/00
B64C-021/04
B64C-021/00
출원번호
UP-0509780
(2006-08-25)
등록번호
US-7637462
(2010-01-07)
발명자
/ 주소
Pal, Anadish Kumar
인용정보
피인용 횟수 :
12인용 특허 :
5
초록▼
Air pressure distribution for airfoil lower and upper surfaces is utilized to divert airflow using ducts formed in space-curve shapes placed inside the airfoil volume, through span-wise located inlets from high pressure areas on the airfoil lower surface near the leading edge and through chord-wise
Air pressure distribution for airfoil lower and upper surfaces is utilized to divert airflow using ducts formed in space-curve shapes placed inside the airfoil volume, through span-wise located inlets from high pressure areas on the airfoil lower surface near the leading edge and through chord-wise spaced inlets on the side face of the airfoil wing tip correspondingly to the side face of the airfoil wing tip through chord-wise spaced outlets on the side face of the airfoil wing tip and to span-wise located outlets to the low pressure areas on the airfoil upper surface. Triboelectric materials on the wing surfaces are employed to static charge the air in drag. Inside the ducts, the employment of either triboelectric linings and materials, or HV-supplied electrodes, or both, help to static charge the diverted air flow to and from the airfoil wing tip side face to diffuse wing tip vortex core early.
대표청구항▼
What is claimed is: 1. A wing with at least one airfoil comprising: a span, a chord, an upper surface, a lower surface, a leading edge, a trailing edge and a wing tip with a side face; said span longer than said chord at said wing tip and said wing curvilinearly traveling at an angle to said span;
What is claimed is: 1. A wing with at least one airfoil comprising: a span, a chord, an upper surface, a lower surface, a leading edge, a trailing edge and a wing tip with a side face; said span longer than said chord at said wing tip and said wing curvilinearly traveling at an angle to said span; a volume formed by an enclosure of said upper surface of said airfoil, said lower surface of said airfoil on said leading edge and said trailing edge of said airfoil, with said wing tip forming a span-wise closing of said volume; an inlet to at least one duct, located on said lower surface of said airfoil, at a chord-wise distance less than one tenth of the chord length of said airfoil from said leading edge; said duct positioned within said volume lengthwise and formed as a space curve; an outlet to said duct opening flush with the outer side of said side face of said wing tip; said outlet to said duct located at a chord-wise distance more than one tenth of the chord length of said airfoil from said leading edge; said outer side of said side face of said wing tip being a normal plane to said space curve; said inlet to said duct, located on said lower surface of said airfoil, allowing the air at high pressure near said inlet to enter said duct, travel through said duct and to exit from said outlet to said duct opening flush with the outer side of said side face of said wing tip; and said duct is dielectric and is lined with triboelectric material or with at least one high-voltage-supplied electrode, with said triboelectric material or said high-voltage-supplied electrode to produce at least one static-charged wing tip side face jet to effect a reduction in the vortex produced by said wing tip by momentarily decelerating the air near said wing tip to delay vortex rollup and to early diffuse the core of said vortex by promoting interlayer movement of said vortex due to static charge difference. 2. A wing in accordance with claim 1, wherein a first said duct with said inlet and said outlet followed by another said duct with another said outlet chord-wise, towards said trailing edge of said airfoil, following said outlet to said first duct and another said inlet to said another duct span-wise, towards the other side of said side face of said wing tip, following said inlet to said first duct form a series of ducts to produce a plurality of said wing tip side face jets to effect said reduction in said vortex produced by said wing tip of said wing. 3. A wing in accordance with claim 2, wherein said high-voltage-supplied electrode is supplied with a voltage ranging between 500 to 18000 volts with a current limit and said voltage either a dc voltage or an ac voltage with a frequency fixed or variable between 4 to 50 Hz generated by a high voltage generator circuit, and said voltage applied between said high-voltage-supplied electrode and a selective electrically conductive external surface of said wing. 4. A wing in accordance with claim 2, wherein said outer side of said side face of said wing tip is made of or coated with a dielectric with triboelectric properties. 5. A wing with at least one airfoil comprising: a span, a chord, an upper surface, a lower surface, a leading edge, a trailing edge and a wing tip with a side face; said span longer than said chord at said wing tip and said wing curvilinearly traveling at an angle to said span; a volume formed by an enclosure of said upper surface of said airfoil, said lower surface of said airfoil on said leading edge and said trailing edge of said airfoil, with said wing tip forming a span-wise closing of said volume; an inlet to at least one duct, located on said lower surface of said airfoil, at a chord-wise distance more than one fifth of said chord of said airfoil from said leading edge; said duct positioned within said volume lengthwise and formed as a space curve; an outlet to said duct opening flush with the outer side of said side face of said wing tip; said outlet to said duct located at a chord-wise distance less than one fifth of said chord of said airfoil from said leading edge; said outer side of said side face of said wing tip being a normal plane to said space curve; said inlet to said duct, located on said lower surface of said airfoil, allowing the air at high pressure near said inlet to enter said duct, travel through said duct and to exit from said outlet to said duct opening flush with the outer side of said side face of said wing tip; and said duct is dielectric and is lined with triboelectric material or with at least one high-voltage-supplied electrode, with said triboelectric material or said high-voltage-supplied electrode to produce at least one static-charged wing tip side face jet to effect a reduction in the vortex produced by said wing tip by momentarily decelerating the air near said wing tip to delay vortex rollup and to early diffuse the core of said vortex by promoting interlayer movement of said vortex due to static charge difference. 6. A wing in accordance with claim 5, wherein a first said duct with said inlet and said outlet followed by another said duct with another said outlet chord-wise, towards the trailing edge of said airfoil, following said outlet to said first duct and another said inlet to said another duct span-wise, towards the other side of said wing tip, following said inlet to said first duct form a series of ducts to produce a plurality of said wing tip side face jets. 7. A wing in accordance with claim 6, wherein said high-voltage-supplied electrode is supplied with a voltage ranging between 500 to 18000 volts with a current limit and said voltage either a dc voltage or an ac voltage with a frequency fixed or variable between 4 to 50 Hz generated by a high voltage generator circuit, and said voltage applied between said high-voltage-supplied electrode and a selective electrically conductive external surface of said wing. 8. A wing in accordance with claim 6, wherein said outer side of said side face of said wing tip is made of or coated with a dielectric with triboelectric properties. 9. A wing with at least one airfoil comprising: a span, a chord, an upper surface, a lower surface, a leading edge, a trailing edge and a wing tip with a side face; said span longer than said chord at said wing tip and said wing curvilinearly traveling at an angle to said span; a volume formed by an enclosure of said upper surface of said airfoil, said lower surface of said airfoil on said leading edge and said trailing edge of said airfoil, with said wing tip forming a span-wise closing of said volume; an inlet to a duct, located on said lower surface of said airfoil, at a chord-wise distance less than one tenth of said chord of said airfoil from said leading edge; said duct positioned within said volume lengthwise and formed as a space curve; an outlet to said duct opening flush with the outer side of said side face of said wing tip, located above the mean line of said airfoil, at a chord-wise distance more than one tenth of said chord of said airfoil from said leading edge; said outer side of said side face of said wing tip being a normal plane to said space curve; said inlet to said duct, located on said lower surface of said airfoil, allowing the air at high pressure near said inlet to enter said duct, travel through said duct and to exit from said outlet to said duct; an outlet to at least one second duct, located on said upper surface of said airfoil, at a chord-wise distance less than one fifth said chord of said airfoil from said leading edge; said second duct positioned within said volume lengthwise and formed as a space curve; an inlet to said second duct opening flush with the outer side of said side face of said wing tip, located below the mean line of said airfoil, at a chord-wise distance more than one fifth of said chord of said airfoil from said leading edge; said outer side of said side face of said wing tip being a normal plane to said space curve; said inlet to said second duct allowing the air at high pressure near said inlet to enter said second duct to travel through said second duct and to exit from said outlet to said second duct, located on said upper surface of said airfoil; and said duct and said second duct being dielectric and lined with triboelectric material or with high-voltage-supplied electrodes, with said triboelectric material or said high-voltage-supplied electrodes producing static-charged wing tip side face jets to effect a reduction in the vortex produced by said wing tip by momentarily decelerating the air near said wing tip to delay vortex rollup and to early diffuse the core of said vortex by promoting interlayer movement of said vortex due to static charge difference. 10. A wing in accordance with claim 9, wherein said outlet to said duct followed chord-wise, towards the trailing edge of said airfoil, by said outlet to said second duct form a series of outlets flush with said outer side of said side face of said wing tip, with said inlet to said duct followed span-wise, towards the other side of said side face of said wing tip, by said inlet to said second duct forming a series of inlets, said inlet to said second duct opening flush with the outer side of said side face of said wing tip followed chord-wise, towards the trailing edge of said airfoil, by another said second inlet to another said second duct opening flush with said outer side of said side face forming a second series of inlets flush with said outer side of said side face, and said outlet to said second duct followed span-wise, towards the other side of said side face of said wing tip, by another said second outlet to said another said second duct forming a second series of outlets. 11. A wing in accordance with claim 10, wherein said high-voltage-supplied electrodes are supplied with a voltage ranging between 500 to 18000 volts with a current limit and said voltage either a dc voltage or an ac voltage with a frequency fixed or variable between 4 to 50 Hz generated by a high voltage generator circuit, and said voltage applied between said high-voltage-supplied electrodes and a selective electrically conductive external surface of said wing. 12. A wing in accordance with claim 10, wherein said outer side of said side face of said wing tip is made of or coated with a dielectric with triboelectric properties.
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