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(12) PATENT APPLICATION PUBLICATION
(19) INDIA (21) Application No.: 01130/KOLNP/2005 A
(22) Date of filing of Application: 13/06/2005 (43) Publication Date: 09/06/2006
(54) Title of the invention: ROTOR BLADE FOR A WIND POWER PLANT
(51) International classification : F03D 1/06
(31) Priority Document No : 103 00 284.7
(32) Priority Date : 02/01/2003
(33) Name of priority country : DE
(86) International Application No and : PCT/EP03/014621
Filing Date
: 19/12/2003
(87) International Publication No : WO 04/061298 A2
(61) Patent of addition to Application No : NIL
Filed on : N.A.
(62) Divisional to Application No : NIL
Filed on : N.A.
(57) Abstract:
(71) Name of Applicant:
WOBBEN ALOYS
Address of the Applicant:
ARGESTRASSE 19 26607 AURICH GERMANY
(72) Name of the Inventor:
1) WOBBEN ALOYS
Filed U/S 5(2) before The Patents (Amendment)
Act, 2005: NO
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
realisation 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 realisation 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.
(FIG. - Nil)
The Patent Office Journal 09/06/2006 11079