F - Mech Eng,Light,Heat,Weapons – 03 – D
Patent
F - Mech Eng,Light,Heat,Weapons
03
D
170/5
F03D 3/00 (2006.01) F03D 1/06 (2006.01)
Patent
CA 1188994
-12- A B S T R A C T Each radially extending blade (12) of a wind motor is fitted near its tip with an auxiliary vane (13) which can result in an increase of efficiency. Different from known devices each auxiliary vane (13) is placed with respect to the blade (12) so that the low-pressure peaks of the vanes (13) and the blades (12) are separated one from the other during rotation by more than 0.3-times the length of the largest chord. Preferably the auxiliary vanes (13) are designed so that its center of gravity lies in front of the blade (12). The lengthwise axis of the auxiliary vanes (13) makes an angle .alpha. lying between 10° and 40° with the rotational axis (11) of the blades (12), the lateral edges (17) of the vanes (13) is bevelled rearward with respect to the leading edge (16) under an angle .beta. from 15° to 45° and the surfaces meeting surfaces meeting at the lateral edges (17) make an angle .gamma. which approaches zero value. The lines generating the underside of the vanes (13) are nearly straight. The imaginary extensions of the surfaces of adjacent vanes (13) as seen from the surface comprising the blades (12), at least contact each other.
417896
Fetherstonhaugh & Co.
Stichting Energieonderzoek Centrum Nederland
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