CA1169778A - Slat for wind energy convertor - Google Patents

Slat for wind energy convertor

Info

Publication number
CA1169778A
CA1169778A CA000389456A CA389456A CA1169778A CA 1169778 A CA1169778 A CA 1169778A CA 000389456 A CA000389456 A CA 000389456A CA 389456 A CA389456 A CA 389456A CA 1169778 A CA1169778 A CA 1169778A
Authority
CA
Canada
Prior art keywords
slat
wind energy
vane
airfoil
energy convertor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA000389456A
Other languages
French (fr)
Inventor
Witold Brzozowski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CA000389456A priority Critical patent/CA1169778A/en
Application granted granted Critical
Publication of CA1169778A publication Critical patent/CA1169778A/en
Expired legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D3/00Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06Rotors
    • F03D3/061Rotors characterised by their aerodynamic shape, e.g. aerofoil profiles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00Components
    • F05B2240/20Rotors
    • F05B2240/30Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05B2240/301Cross-section characteristics
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/74Wind turbines with rotation axis perpendicular to the wind direction

Abstract

SLAT FOR WIND ENERGY CONVERTOR

ABSTRACT OF THE DISCLOSURE

The disclosure describes a wind energy convertor with improved efficiency comprising a common axle, a plurality of vanes adapted to rotate about the common axle, the vanes being spaced from the axle, each vane having a symmetrical airfoil cross-section. A symmetri-cal slat is spacedly mounted in front of the leading edge of each vane, thus forming an air passage between the airfoil and the slat.

Description

7~7~

BACKGROUND OF INVENTION
ta) Field of Invention This invention relates to a slat for a wind energy convertor. More specifically, the invention relates to a wind energy convertor having a main vertical axle, vane mounting members extending radially from the main axle, vanes perpendicular to the vane mounting members, and slats disposed in front of the vanes to improve the efficiency of the wind energy convertor.
(b) Description of Prior Art In my Canadian application No. 281,008 filed June 21, 1977, I have described a wind energy convertor which has a vertical axis of rotation and a plurality of vanes spaced from the said axis and rotating around it.
~lthough this system offers many advantages as a reliable wind energy convertor, it would offer further advantages if its efficiency could be improved.
On the other hand, slats are known in aviation and are used to increase the ratio of lift coefficient to drag coefficient. However, they were developed and used exclusively on asymmetrical airfoils and were never applied to wind turbines.

7~1~

SUMMARY OF INVENTION
It is an object of the invention to provide a wind energy convertor with improved efficiency It is an object of t~e present invention to increase the amount of energy obtained with a wind energy convertor by providing slats ahead of the leading edge of the airfoil of the vanes.
It is yet another object of the present invention to increase the torque and the power of a wind energy convertor.
According to the present invention there is provided a wind energy convertor comprising a common axle, a plurality of vanes adapted to rotate about the common axle, the vanes being spaced from the axle, each vane having a symmetrical airfoil cross-section. A symmetrical slat is spacedly mounted in front of the leading edge of each vane, thus forming an air passage between the airfoil and the slat.
In accordance with a preferred embodiment of the invention, the outer contour of the slat is about the same as the contour of the leading edge of the airfoil.
BRIEF DESCRIPTION OF DRA~qNGS
FIGURE 1 is a view of a symmetrical airfoil provided with a symmetrical slat.
FIGURE 2 is a view of a wind energy con-vertor wherein the vanes each have a slat mounted in front of its leading edge.
Referring to the drawings, it will be seen that the vane 1 is the same as that described in my 7~3 Canadian application ~o. 281,008. Of course other types of of vanes could be used without depart ~rom the scope of of the presènt invention. ~he vane is symmetrical, as shown and the length of the cord of the vane is represent-ed by A-s.
Turning now to the slat 3 which appears in front of the leading edge 11 of the vane L it will be seen that it is also symmetrical with respect to the center line 7. B-C represents the distance between the airfoil and the outer surface of the slat, measured along the center line of the combination.
- The slat 3 is shaped as shown in the drawings and has an outer face Sl which is convex so as to have approximately the same form as the convex leading edge 11 of the vane 1. The inner face S2 of the slat 3 is concave, as shown, but its radius of curvature is longer than the radius of the outer face Sl. The inner face S2, shaped as it is and spaced from outer face Sl is intended to decrease too abrupt a change in an area of the air passage between the airfoil and the slat. Also, the pointed ends 15 and 17 of the slat are in line with a tangent of outer face 11 of the vane which passes at the center line of the vane 1.
The slat 3 is mounted on the vane 1 in any manner known to those skilled in the art. In the embodi-ment illustrated, a bolt 19 extends through the slat atthe center line 7 thereof and a spacer 21 keeps the lead-ing edge 11 of the vane 1 and the inner surface S2 of the slat 3 at a predetermined distance from one another.
A nut 23 holds the assembly together.

7~'8 It will also be noted that the outer ~ace Sl of the slat is spaced from the leading edge by approxi-mately half of the maximum thickness of the air~oil when rneasured on the center line of the airfoil.
The ~unction of the slat is as follows.
When the wind creates a pressure on one side of the vane 1, the airflow around the airfoil, close to the leading edge is divided into two streams. The largest portion of the stream which flows forward in the dir-ection of the vane movement, enters the space between the airfoil and the slat. The slat changes the direc-tion of the airflow and drives it to the low pressure side of the vane. The change of the airflow direction creates a force acting on the slat in the direction of the vane movement and at the same time, reduces the drag.
Furthermore, an increase of the flow on the low pressure side further decreases the negative pressure and at the same time, increases the productive force acting on the vane.
The additional internal surface S2 of the slat is intended to reduce an abrupt change in the airflow cross-section area between the airfoil and the slat, especially in its central portion and at the same time, to reduce to its minimum the airflow turbulence.

Claims (4)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows
1. A wind energy convertor comprising a common axle, a plurality of vanes adapted to rotate about said common axle, said vanes being spaced from said axle, each vane having a symmetrical airfoil cross-section, and a symmetrical slat spacedly mounted in front of the leading edge of each vane, thus forming an air passage between said airfoil and said slat.
2. A wind energy convertor according to claim 1, wherein said slat has an outer surface approximately the same form as the form of the leading edge of the air-foil.
3. A wind energy convertor according to claim 2, wherein the outer surface of said slat is spaced from the leading edge by approximately half of the maximum thickness of the airfoil when measured on center line of the airfoil.
4. A wind energy convertor according to claims 1, 2 and 3, wherein the slat has an inner surface spaced from the outer surface so that the area of the air passage cross-sections do not change abruptly thus re-ducing turbulence in the air-flow.
CA000389456A 1981-11-04 1981-11-04 Slat for wind energy convertor Expired CA1169778A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA000389456A CA1169778A (en) 1981-11-04 1981-11-04 Slat for wind energy convertor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA000389456A CA1169778A (en) 1981-11-04 1981-11-04 Slat for wind energy convertor

Publications (1)

Publication Number Publication Date
CA1169778A true CA1169778A (en) 1984-06-26

Family

ID=4121336

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000389456A Expired CA1169778A (en) 1981-11-04 1981-11-04 Slat for wind energy convertor

Country Status (1)

Country Link
CA (1) CA1169778A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001014741A1 (en) * 1999-08-21 2001-03-01 Alfred Wilhelm Light wind strip for wind power plants
US20110064582A1 (en) * 2008-05-30 2011-03-17 Ignacio Romero Sanz Wind turbine blade with high-lift devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001014741A1 (en) * 1999-08-21 2001-03-01 Alfred Wilhelm Light wind strip for wind power plants
US20110064582A1 (en) * 2008-05-30 2011-03-17 Ignacio Romero Sanz Wind turbine blade with high-lift devices

Similar Documents

Publication Publication Date Title
US20230250797A1 (en) Fluid turbine systems
US3995970A (en) Axial-flow fan
US4618313A (en) Axial propeller with increased effective displacement of air whose blades are not twisted
US9151270B2 (en) Flatback slat for wind turbine
US5106265A (en) Wind-turbine wing with a pneumatically actuated spoiler
CA2625997C (en) Blade for a wind turbine rotor
US8777580B2 (en) Secondary airfoil mounted on stall fence on wind turbine blade
US9175666B2 (en) Slat with tip vortex modification appendage for wind turbine
CA1141668A (en) Wind turbine of cross-flow type
US20100232972A1 (en) Rotor blade for a wind power plant
KR101787294B1 (en) Rotor blade of a wind turbine and wind turbine
EP0942175A4 (en) Centrifugal blower, method of manufacturing the same, and air-conditioner provided with the same
GB2295860A (en) Turbine and turbine blade
KR100766729B1 (en) Rotor blade for a wind power plant
US10907610B2 (en) Wind-turbine rotor blade, rotor blade trailing edge, method for producing a wind-turbine rotor blade, and wind turbine
CN103097722A (en) Wind turbine blade with narrow shoulder and relatively thick airfoil profiles
US4093402A (en) Propeller or a set of wings for a wind mill
CA2395214A1 (en) Rotor blade for a wind power installation
CN105358836A (en) Axial fan
US10041470B2 (en) Wind turbine blade having a shaped stall fence or flow diverter
US5246339A (en) Guide vane for an axial fan
US10815963B2 (en) Wind-turbine rotor blade, trailing edge for wind-turbine rotor blade tip, method for producing a wind-turbine rotor blade, and wind turbine
CA1169778A (en) Slat for wind energy convertor
CN110360150B (en) Wind wheel, centrifugal fan and air conditioner indoor unit
EP0418303B1 (en) Guide vane for an axial fan

Legal Events

Date Code Title Description
MKEX Expiry