Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Tined or irregular periphery
Reexamination Certificate
2003-12-19
2009-06-02
Nguyen, Ninh H (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Tined or irregular periphery
C416S235000
Reexamination Certificate
active
07540716
ABSTRACT:
The present invention concerns a rotor blade for a wind power plant having an aerodynamic profile comprising a rotor blade leading edge and a rotor blade trailing edge. The invention also concerns a rotor blade tip for a rotor blade having an aerodynamic profile with a pressure and a suction side, wherein the rotor blade tip is curved or angled in its end region in the direction of the pressure side of the rotor blade. In order further to reduce the levels of sound emission of wind power plants the rotor blade is curved or angled in its edge region in the direction of the trailing edge of the rotor blade in the plane of the rotor blade. In that respect the invention is based on the realization that, in the case of a rotor blade which does not go to a point at the tip, the effective rotor blade area is maintained unreduced precisely in the outer region in which the effect is greatest. The curve or angling of the end region of the rotor blade however provides that the trailing edge is displaced rearwardly in the end region of the rotor blade so that the flow at the rotor blade trailing edge is detached with a time delay in the outer region. Alternatively to attain the object of the invention a rotor blade can be developed in such a way that the ‘outer region’ narrows. That configuration of the rotor blade tip is based on the realization that the decreasing blade depth results in a reduced flow around the blade tip as the energy thereof is previously distributed to the trailing edge vortices but at the same time the effective rotor blade area is also reduced. The angling of the rotor blade tip provides that the effective rotor blade depth remains at its optimum as far as the angled rotor blade tip.
REFERENCES:
patent: 3171495 (1965-03-01), Puckett
patent: 3411738 (1968-11-01), Sargent
patent: 4093402 (1978-06-01), Van Holten
patent: 4168939 (1979-09-01), Schmitz et al.
patent: 4291235 (1981-09-01), Bergey, Jr. et al.
patent: 4324530 (1982-04-01), Fradenburgh et al.
patent: 4533297 (1985-08-01), Bassett
patent: 4714215 (1987-12-01), Jupp et al.
patent: 4722608 (1988-02-01), Salzman et al.
patent: 4776542 (1988-10-01), Van Dam
patent: 5215441 (1993-06-01), Evans et al.
patent: 5217349 (1993-06-01), Succi
patent: 5474425 (1995-12-01), Lawlor
patent: 5525269 (1996-06-01), Connolly et al.
patent: 5584661 (1996-12-01), Brooks
patent: 6116857 (2000-09-01), Splettstoesser et al.
patent: 6142738 (2000-11-01), Toulmay
patent: 6334705 (2002-01-01), Weetman
patent: 6979179 (2005-12-01), Moller Larsen
patent: 2004/0028528 (2004-02-01), Flemming
patent: 4030559 (1992-04-01), None
patent: 4136956 (1993-05-01), None
patent: 44 36 197 (1996-04-01), None
patent: 44 40 744 (1996-05-01), None
patent: 19614420 (1997-10-01), None
patent: 197 38 278 (1999-03-01), None
patent: 19743694 (1999-04-01), None
patent: 199 63 252 (2001-07-01), None
patent: 04137892 (1992-11-01), None
patent: 9603215 (1996-02-01), None
patent: 9914490 (1999-03-01), None
Antoniou, I., et al., “A Theoretical and Experimental Investigation of New Tip Shapes,” in Proceedings of the European Community Wind Energy Conference, Germany, Mar. 8-12, 1993, pp. 280-285.
Office Action relating to Argentinian Patent Application No. P03 01 04866, Retrieved Jun. 5, 2008, 5 pages.
Statement of Grounds and particulars issued by the Australian Patent Office, relating to Australian Patent Application No. 2003296688 in the name of Aloys Wobben, dated Jul. 30, 2008, 11 pages.
Imamura, Hiroshi et al., “Numerical Analysis of the Horizontal Axis Wind Turbine with Winglets,” JSME International Journal, 1998, pp. 170-176, Series B., vol. 41, No. 1.
Shimizu, Yukimaru et al., “Power Augmentation Effects of a Horizontal Axis Wind Turbine With a Tip Vane - Part 1: Turbine Performance and Tip Vane Configuration,” Journal of Fluids Engineering, 1994, pp. 287-292, vol. 116.
Shimizu, Yukimaru et al., “Power Augmentation Effects of a Horizontal Axis Wind Turbine With a Tip Vane - Part 2: Flow Visualization,” Journal of Fluids Engineering, 1994, pp. 293-297, vol. 116.
Sepra, David A. (editor), “Wind Turbine Technology, Fundamental Concepts of Wind Turbine Engineering,” 1994, pp. 302-304, Asme Press.
Van Holten, T., “Concentrator Systems for Wind Energy, with Emphasis on Tip-vanes,” Wind Engineering, 1981, 17 pages, vol. 5, No. 1.
Van Holten, T., “Tipvane Research at the Delft University of Technology,” Second International Symposium on Wind Energy Systems, Oct. 3rd-6th, 1978, 12 pages, Amsterdam, Netherlands.
Gyatt, G. W. et al., “Development and Testing of Tip Devices for Horizontal Axis Wind Turbines,” Final Report Aerovironment, Inc., May 1985, 85 pages.
Muller, R. H. G. et al., “The Influence of Wringlets of Rotor Aerodynamics,” Vertica vol. 11., No. 4, Nov. 3, 1987, pp. 601-618.
Muller, R. H. G. et al., “Winglets on Rotor Blades in Forward Flight - A Theoretical and Experimental Investigation,” Vertica, vol. 14, No. 1, Nov. 1, 1990, pp. 31-46.
Shimizu, Y. et al., “Studies on Horizontal Axis Wind Turbines with Tip Attachments,” EWEC '90. Conference Proceedings, Madrid, Spain, Sep. 10-14, 1990, 5 pages.
Nguyen Ninh H
Seed Intellectual Property Law Group PLLC
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