WO2018055636A1

WO2018055636A1 - Venturi actuated vertical axis wind turbine with improved rotor wings

Info

Publication number: WO2018055636A1
Application number: PCT/IN2017/050406
Authority: WO
Inventors: Georgos KARYTINOS
Original assignee: Anemos Energies Private Limited
Priority date: 2016-09-20
Filing date: 2017-09-17
Publication date: 2018-03-29
Also published as: CN109964028A

Abstract

The present disclosure relates to an arrangement of a venturi actuated wind turbine with a geometrically arranged set of rotor wing assembly comprising of slots, slats and flap. The radial arrangement of blades has an outer ring of vertical as well as horizontal diffusers to channel the wind coming in from any direction. The assemblage of slots, slats and flap is fashioned such that the combination mimics a bigger wing coupled with a smaller wing which creates a push effect on the first wing as well as a pull effect on the reverse side in the same direction, thereby increasing the efficiency of the turbine.

Description

VENTURI ACTUATED VERTICAL AXIS WIND TURBINE WITH

IMPROVED ROTOR WINGS

CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY

[001] The present application does not claim priority from any patent application.

TECHNICAL FIELD

[002] The present disclosure relates to the field of wind turbines and more particularly to a Venturi actuated vertical axis wind turbine having a concentric arrangement of blades, each blade comprised of multitudes of slots and a slat, for deflecting wind forces for wind flow acceleration.

BACKGROUND

[003] Conventional wind turbines operate on the energy of the wind to turn propeller-like blades with no moving or removable components around a rotor. The rotor is connected to either a vertical or horizontal shaft mounted generator that spins to generate electricity. Wind turbines are preferably mounted on an elevated structure so as to capture the maximum energy in a location so as to receive full effects of the wind yet not to disturb the immediate environment. Wind turbines can have blades that spin with respect to horizontal or vertical orientation.

[004] Wind energy is essentially the kinetic energy of the wind converted to different forms, making wind an environmentally sound source of energy. Wind energy does not pollute the air unlike power plants that rely on combustion of coal or gas. Wind energy is a renewable source of energy unlike traditional sources such as coal. Wind turbines that rotate about a horizontal axis are best suited for large unobstructed areas hence the creation of wind farms. Vertically disposed wind turbines are well suited for congested areas such as residential neighborhoods. [005] It makes economic sense to use wind turbines only of the cost is competitive with traditional sources of energy. The efficiency of the wind turbine must be higher than conventional sources of power as well.

[006] Further, although wind power plants are environmentally friendly, there is significant noise generated by the larger turbines. Further, like jet engines, the blades of the horizontal axis turbines pose as a safety hazard to birds.

[007] The need of the hour is for a renewable source of energy with high efficiency in conversion of kinetic energy to mechanical energy.

[008] Following are some of the patent applications and literature on vertical axis wind turbine wherein the blade geometry is significantly different to that of the present invention:

Vertical Axis Wind Turbine (US 9022721)

The present invention relates to the field of wind turbines wherein a vertical axis wind turbine formed from a concentric arrangement of fixed stator blades to provide fluid flow acceleration in to an arrangement of rotatable blades secured to a generator for invoking electrical power generation. The stator blades are maintained in a fixed position by use of an upper and lower stator plate. The rotor blades include an upper and lower plate, the upper plate coupled to the upper stator plate and the lower rotor plate coupled to the generator.

[009] Existing vertical axis wind turbines are formed using fixed stator blades which are composed of a single unit. What is lacking in the art is a vertical axis wind turbine design capable of producing a wind turbine, wherein the rotor blades produce energy by the buoyancy generated on the rear surface rather than by the pressure on the front surface of the rotor blades. The instant invention addresses these and other shortcomings by introducing a vertically aligned wind turbine power generator having improved rotor blade geometry.

SUMMARY

[010] This summary is provided to introduce aspects related to systems and methods for vertical axis wind turbine and the aspects are further described below in the detailed description. This summary is not intended to identify essential features if the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter.

[011]Disclosed is a vertical axis wind turbine comprising of a diffuser configured from a plurality of geometrically shaped vertical diffusers coupled with one or more horizontal diffusers, wherein each of the vertical diffuser comprises a leading side and a trailing side; wherein the leading side and the trailing side are tapered into a knife edge, and wherein each vertical diffuser having an upper end connected to the roof and the lower end connected to a circular base, each vertical diffuser oriented to provide a stagger angle.

[012]The invention further comprises of a rotor configured from a plurality of geometrically shaped rotor wings having a leading edge and a trailing edge with an upper surface shaped convexly from said rotor wing leading edge to said rotor wing trailing edge and a lower surface shaped concavely from said rotor wing leading edge to said rotor wing trailing edge, each rotor wing having an upper end secured to a rotating base and a lower end secured to a similar rotating base constructed and arranged to rotate about a longitudinal axis within the vertical diffuser section; wherein trailing side of said vertical diffusers are constructed and arranged to generate a swirl velocity whereby the fluid flow is accelerated prior to striking a rotor wing; wherein fluid directed past two adjacent vertical diffusers is accelerated for use in enhanced rotation of rotor wing assembly.

[OOjjOther objectives and advantages of this invention will become apparent from the following description taken in conjunction with any accompanying drawings wherein are set forth, by way of illustration and example, certain embodiments of this invention. Any drawings contained herein constitute a part of this specification and include exemplary embodiments of the present invention and illustrate various objects and features thereof. BRIEF DESCRIPTION OF DRAWINGS

[014] The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawings to refer like features and components.

[015]Figure 1 illustrates a front view of the venturi actuated vertical axis wind turbine in accordance with an embodiment of the present subject matter.

[016] Figure 2 illustrates the top cross sectional view of the venturi actuated vertical axis wind turbine in accordance with an embodiment of the present subject matter.

[017] Figure 3 illustrates the top view of the base of the venturi actuated vertical axis wind turbine, in accordance with an embodiment of the present subject matter.

[018] Figure 4 illustrates the rotor wing assembly placed above the afore mentioned base in a venturi actuated vertical axis wind turbine in accordance with an embodiment of the present subject matter.

[019] Figure 5 illustrates one method of placement of the horizontal and vertical diffusers arrangement in accordance with an embodiment of the present subject matter.

[020] Figure 6 illustrates the vertical cross section of the venturi actuated vertical axis wind turbine in accordance with an embodiment of the present subject matter.

DETAILED DESCRIPTION

[021] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising," "having," "containing," and "including," and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. It must also be noted that as used herein and in the appended claims, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Although any systems and methods for enabling hybrid deployment of an application, similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary, systems and methods for enabling hybrid deployment of an application are now described. The disclosed embodiments for enabling a hybrid deployment of an application are merely examples of the disclosure, which may be embodied in various forms.

[022] Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments for enabling hybrid deployment of an application. However, one of ordinary skill in the art will readily recognize that the present disclosure for venture actuated vertical axis wind turbine is not intended to be limited to the embodiments described, but is to be accorded the widest scope consistent with the principles and features described herein.

[023] The present disclosure relates to a system known as a venturi actuated vertical axis wind turbine with improved rotor wings comprising a diffuser configured from a plurality of geometrically shaped vertical diffusers [101] coupled with one or more horizontal diffusers [102], wherein each of the vertical diffuser[101] comprises a leading side and a trailing side; wherein the leading side and the trailing side are tapered into a knife edge, and wherein each vertical diffuser having an upper end connected to the roof and the lower end connected to a conical base[103], each vertical diffuser oriented to provide a stagger angle.

[024] One embodiment of the invention has a 360° radial arrangement of rotor wing assembly attached to the central rod [301 ]. The radial arrangement of the rotor wing assembly has an outer ring of fixed vertical [101] as well as horizontal diffusers [102] that channel the wind coming in from any direction into a single direction before hitting the wings[401]. The wind while entering the outer assembly of vertical diffusers [101] enters through a wider space and is squeezed through a narrower exit thus increasing the pressure of the wind before hitting the wings [401], The top as well as the bottom of the wind turbine assembly, in this particular embodiment are in a conical shape going inwards for maximum utilization of the windswept area which in turn contributes to increased efficiency.

[025] Further, the described invention also comprises of a rotor configured from a plurality of geometrically shaped rotor wings[401 ] havmg a leading edge and a trailing edge with an upper surface shaped convexly from said rotor wing leading edge to said rotor wing trailing edge and a lower surface shaped concavely from said rotor wing leading edge to said rotor wing trailing edge, each rotor wing having an upper end secured to a rotating base and a lower end secured to a similar rotating base constructed and arranged to rotate about a longitudinal axis within the vertical diffuser section; wherein trailing side of said vertical diffusers are constructed and arranged to generate a swirl velocity whereby the fluid flow is accelerated prior to striking a rotor wing; wherein fluid directed past two adjacent vertical diffusers is accelerated for use in enhanced rotation of rotor wing assembly.

[026] The assemblage of the improved rotor wings is fashioned such that the combination mimics a bigger wing coupled with a smaller wing which creates a push effect on the first wing as well as a pull effect on the reverse side in the same direction, thereby increasing the efficiency of the turbine.

[027] In one embodiment, the venturi actuated vertical axis wind turbine with improved rotor wings comprises of vertical diffuser includes a turning angle between two tangential lines at the leading and trailing side of the meanline between 0 and 22.5 degrees.

[028] In another embodiment venturi actuated vertical axis wind turbine with improved rotor wings comprises of the trailing side of the vertical diffuser [101] being tapered asymmetrically to one side to effectively channel fluid flow.

[029] In yet another embodiment the vertical axis wind turbine with improved rotor wmgs comprises of the rotor wing [401 ] including a turning angle between two tangential hnes at the leading and trailing edge of the meanhne between 0 and 90 degrees.

[030] In one embodiment the vertical axis wind turbine with improved rotor wings comprises of each of the rotor wing [401] assembly composed of but not limited to a central wing, plurality of slots[402], slats [403] and a flap[404] extending from the leading edge to the trailing edge of slats [403].

[031] In another embodiment the vertical axis wind turbine with improved rotor wings comprises of the central wing [401] such that the slot[402] and the flap[404] are joined together to form a single rotor wing..

[032] In one embodiment the vertical axis wind turbine with improved rotor wings comprises of the rotor wing assembly [401] wherein the plurality of the rotor wmgs are separated to regulate and channelize fluid flow in between the components.

[033] In another embodiment the vertical axis wind turbine with improved rotor wings comprises of an outer cylindrical support and a base [103] attached to the vertical diffusers[101] which is connected to an inner central rod [301 ] and a base attached to the rotor wing assembly [401] by means of an inwardly conical sheet [103] wherein the conical sheet is made from material with low surface fiction.

[034] In yet another embodiment the vertical axis wind turbine with improved rotor wmgs comprises of the conical base [103] being made single, continuous sheet or individual strips of material.

[035] In one embodiment the vertical axis wind turbine with improved rotor wings comprises of each of the slat [403], the central wing [401 ], the slot [402] and the flap [404] can move independent of and in relation to each other in an epicyclic path.

Claims

WE CLAIM;

1 . A vertical axis wind turbine comprising: a diffuser configured from a plurality of geometrically shaped vertical diffusers coupled with one or more horizontal diffusers, wherein each of the vertical diffuser comprises a leading side and a trailing side; wherein the leading side and the trailing side are tapered into a knife edge, and wherein each vertical diffuser having an upper end connected to the roof and a lower end connected to a circular base, each vertical diffuser oriented to provide a stagger angle; a rotor configured from a plurality of geometrically shaped rotor wings having a leading edge and a trailing edge with an upper surface shaped convexly from said rotor wing leading edge to said rotor wing trailing edge and a lower surface shaped concavely from said rotor wing leading edge to said rotor wing trailing edge, each rotor wing having an upper end secured to a rotating base and a lower end secured to a similar rotating base constructed and arranged to rotate about a longitudinal axis within the vertical diffuser section; wherein trailing side of said vertical diffusers are constructed and arranged to generate a swirl velocity whereby the fluid flow is accelerated prior to striking a rotor wing; wherein fluid directed past two adjacent vertical diffusers is accelerated for use in enhanced rotation of rotor wing assembly.

2. The vertical axis wind turbine according to claim 1 , wherein each of the vertical diffuser includes a turning angle between two tangential lines at the leading and trailing side of the meanline between 0 and 22.5 degrees.

3. The vertical axis wind turbine according to claim 1 , wherein the trailing side is tapered asymmetrically to one side to effectively channel fluid flow.

4. The vertical axis wind turbine of claim 1 , wherein the rotor wing includes a turning angle between two tangential lines at the leading and trailing edge of the meanline between 0 and 90 degrees.

5. The vertical axis wind turbine of claim 1, wherein each of the rotor wing assembly comprises a central wing, plurality of slots, slats and a flap extending from the leading edge to the trailing edge of slats.

6. The vertical axis wind turbine of claim 7, wherein a central wing, slots, slats and a flap are joined together to form a single rotor wing.

7. The vertical axis wind turbine of claim 1, wherein plurality of the rotor wings are separated to regulate and channelize fluid flow in between the components.

8. The vertical axis wind turbine of claim 1, wherein an outer cylindrical support and a base attached to the vertical diffusers is connected to an inner circular support and a base attached to the rotor wing assembly by means of an inwardly conical sheet wherein the conical sheet is made from any material with low surface fiction.

9. The vertical axis wind turbine of claim 8, wherein the conical sheet may be a single, continuous sheet or individual strips of material joined together by any known methods.

10. The vertical axis wind turbine of claim 1, wherein each of the slat, the central wing, the slot and the flap can move independent of and in relation to each other in an epicyclic path.

11. The vertical axis wind turbine of claim I, wherein power produced equals to P=l/2(rho)AKV3 wherein the (rho) is the product of density, (A) is the frontal area, (K) is the efficiency coefficient and (V) is the fluid velocity.

12. The vertical axis wind turbine of claim 11 wherein the efficiency coefficient (K) is changed with various fluid speed.