GB2450684A - Windturbine in a built-up area - Google Patents

Windturbine in a built-up area Download PDF

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Publication number
GB2450684A
GB2450684A GB0712726A GB0712726A GB2450684A GB 2450684 A GB2450684 A GB 2450684A GB 0712726 A GB0712726 A GB 0712726A GB 0712726 A GB0712726 A GB 0712726A GB 2450684 A GB2450684 A GB 2450684A
Authority
GB
United Kingdom
Prior art keywords
wind turbine
diffuser
scoop
tubular member
rotor
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.)
Withdrawn
Application number
GB0712726A
Other versions
GB0712726D0 (en
Inventor
Fan Wang
David Cullen
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.)
DYNAMIC WIND GENERATORS Ltd
Original Assignee
DYNAMIC WIND GENERATORS Ltd
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 DYNAMIC WIND GENERATORS Ltd filed Critical DYNAMIC WIND GENERATORS Ltd
Priority to GB0712726A priority Critical patent/GB2450684A/en
Publication of GB0712726D0 publication Critical patent/GB0712726D0/en
Publication of GB2450684A publication Critical patent/GB2450684A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/04—Wind motors with rotation axis substantially parallel to the air flow entering the rotor  having stationary wind-guiding means, e.g. with shrouds or channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/04—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor  having stationary wind-guiding means, e.g. with shrouds or channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/04—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor  having stationary wind-guiding means, e.g. with shrouds or channels
    • F03D3/0427—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor  having stationary wind-guiding means, e.g. with shrouds or channels with converging inlets, i.e. the guiding means intercepting an area greater than the effective rotor area
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/10—Stators
    • F05B2240/13—Stators to collect or cause flow towards or away from turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/10—Stators
    • F05B2240/13—Stators to collect or cause flow towards or away from turbines
    • F05B2240/133—Stators to collect or cause flow towards or away from turbines with a convergent-divergent guiding structure, e.g. a Venturi conduit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2250/00—Geometry
    • F05B2250/70—Shape
    • F05B2250/71—Shape curved
    • F05B2250/711—Shape curved convex
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2250/00—Geometry
    • F05B2250/70—Shape
    • F05B2250/71—Shape curved
    • F05B2250/712—Shape curved concave
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/74—Wind turbines with rotation axis perpendicular to the wind direction

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Abstract

A small scale wind turbine for use in built-up areas (10). The turbine has a rotor (12) and blades (16) which are located in a tubular section (18) which is bounded by a scoop (24) at the entry and a diffuser (28) at the exit. Various embodiments are described for the profiles and relative dimensions of the components such as a symmetrical arrangement with the diffuser and scoop having oppositely arranged concave profiles (32) and the rotor blades being located near the entry. This arrangement increases the output power over that of the rotor and blade arrangement alone.

Description

Improvements in or relating to wind turbines The present invention
relates to wind turbines and in particular, though not exclusively, to a domestic wind turbine for use in a built up environment with increased output power.
Wind farms are now a familiar sight across the country. These large scale turbines are characterised by their long rotor blades rotating in the force of the wind. The growing awareness of global warming and promotion of harnessing renewables have led to wind turbines expanding from these preferable open sites into built up areas for use on a more domestic level.
Small scale turbines i.e. those with a rotor span less than two metres, are now being developed. These turbines normally consist of three parts, a rotor, a generator and a yaw-pole mechanism. The wind turns the rotor into the wind via the yaw-pole mechanism and the rotor blades rotate to power the generator.
One of the disadvantages of using turbines in built up areas is that the wind is significantly weaker and more turbulent than that in open fields where traditional wind farms are situated. This provides a major disadvantage for small wind turbines as only a small torque is generated which results in difficulty to start the blades rotating in the low wind speed found in built up areas.
In order to overcome this disadvantage prior art small scale wind turbines have been developed were the number of rotor blades have been increased. This is done in order to add more torque to help start the wind turbine. A disadvantage of increasing the number of blades is that the turbine is harder to balance and yaw. A trade off must then be applied to achieve a stable structure which can operate in the low wind speed while providing sufficient power output.
It is an object of the present invention to provide a wind turbine for use in built up areas which has increased power output over a prior art turbine having an identical rotor and blade arrangement.
According to a first aspect of the present invention there is provided a wind turbine for use in built-up areas, the turbine comprising a rotor having a plurality of rotor blades arranged to turn upon incident wind thereupon, characterised in that the turbine further comprises: a tubular member, in which is located the rotor and rotor blades; a scoop, the scoop being located at a first end of the tubular member and having a concave inner surface; and a diffuser, the diffuser being located at an opposing end of the tubular member and having a radially extending inner surface.
In this way the scoop catches more wind and accelerates the air speed through the tubular member assisted by the diffuser. The air within the tubular member then has less turbulence and consequently passes more momentum onto the blades of the rotor increasing the energy conversion.
Preferably the turbine is a small scale wind turbine. More preferably the wind turbine has an outer diameter between approximately 1 m and 1.5m.
The diffuser may have a convex inner surface. More preferably the diffuser has a concave inner surface in an opposite direction to that of the scoop.
Preferably the tubular member is at least three times the length of the rotor. This provides a narrowed channel for air flow through the tunnel.
Preferably the scoop has a continuous smooth inner surface. In this way there are no apertures or ridges which would increase turbulence as the air passes into the scoop.
Preferably also the scoop has a depth along a central axis of the turbine which is less than the length of the tubular section arranged on the central axis. The scoop may have a diameter at a distal end greater than or equal to the combined depth of the scoop and length of the tubular member.
Additionally the scoop may have an outer diameter at the distal end which is approximately twice the diameter of the tubular section.
Advantageously the scoop has an inner surface at the distal end which is substantially parallel to an inner surface of the tubular section.
Preferably the diffuser has a continuous smooth inner surface. In this way there are no apertures or ridges which would increase turbulence as the air passes out of the diffuser.
Preferably also the diffuser has a depth along a central axis of the turbine which is less than the length of the tubular section arranged on the central axis. The diffuser may have a diameter at a distal end greater than or equal to the combined depth of the diffuser and length of the tubular member. Additionally the diffuser may have an outer diameter at the distal end which is approximately twice the diameter of the tubular section.
Advantageously the diffuser has an inner surface at the distal end which is substantially parallel to an inner surface of the tubular section.
Preferably the scoop and diffuser are symmetrical about the tubular member. More preferably the scoop and the diffuser have approximately the same inner surface profiles. In an embodiment, the scoop and diffuser have approximately the same dimensions. In an alternative embodiment the diffuser extends to a larger diameter than the scoop In this way the diameter at the exit of the diffuser is greater than the diameter at the entrance of scoop.
Preferably the span of the rotor blades substantially extends across the inner diameter of the tubular section. Preferably also the rotor blades are arranged closer to the scoop than the diffuser.
In an embodiment there are six rotor blades. The blades may be of any suitable thickness and profile. In an embodiment the blades are Airfoil SD2030.
The rotor may have a nose cone and/or a nacelle. The nose cone may be rounded or pointed. The nacelle may be a parabola, tangent ogive or ellipse profile. Preferably the diameter of the nose cone and/or nacelle is less than a third of the inner diameter of the tubular section. In an embodiment the nose cone is rounded and the nacelle is a section of an ellipse.
Embodiments of the present invention will now be described, by way of example only, with reference to the following drawings of which: Figure 1 is a schematic illustration of a cross-sectional view through a wind turbine according to an embodiment of the present invention; Figure 2 is a series of illustrations of nose cone and nacelle combinations for use in a wind turbine according to an embodiment of the present invention; and Figure 3 is a schematic illustration of a cross-sectional view through a wind turbine according to an alternative embodiment of the present invention.
Referring initially to Figure 1 there is illustrated a wind turbine, generally indicated by reference numeral 10, according to an embodiment of the present invention. Turbine 10 comprises a rotor 12 including a generator 14 and rotor blades 16. A hooded section 18 is arranged around the rotor 12. Hooded section 18 is a substantially tubular arrangement having an inner surface 20 and an outer surface 22 made of a thin lightweight material such as moulded fibre glass. The hooded section 18 comprises a front scoop 24, a middle cylindrical section 26 and a rear diffuser 28.
The inner surface 20 at the scoop extends radially outwardly from the middle section 26 to provide a sweeping curve to the distal end 30 of the scoop 24. In this way the inner surface 20 of the scoop 24 presents a concave surface 32 in the incident wind direction. The inner surface 20 is kept as smooth and uninterrupted as possible to reduce turbulence through the turbine 10.
The distal end 30 of the scoop 24 is also parallel to a central axis 33 arranged longitudinally through the turbine. In order to funnel air into the turbine, the distal end 30 of the scoop 24 has a diameter which is significantly greater than the diameter of the middle section 26. In the embodiment shown the diameter at the distal end 30 of the scoop 24 is twice the size of the diameter of the inner surface 32 at the middle section 26. Additionally the depth of the scoop 24 along the central axis 33 is less than the length of the middle section 26 along the central axis 33.
The middle section 26 is a hollow cylindrical portion having an entrance 34 and an exit 36 at each end thereof. The middle section 26 provides a tunnel in which the rotor 12 is located. The section 26 is significantly longer than the length of the rotor 12. The rotor 12 is located towards the entrance 34 of the middle section 26. In the embodiment shown the rotor blades 16 are located approximately a quarter of the way into the middle section 26. Supports (not shown) are positioned between the rotor 12 and the hood 18 to hold the rotor centrally in the middle section 26 i.e. colinear with the central axis 33.
Attached to the exit 36 is a diffuser 28. Known diffusers 28 provide a funnel having an inner surface which flares out from the exit. This inner surface may be straight or curved to give a horn shaped exit to the hooded section 18. While such a horn diffuser could be used here, it is preferred to use a curved surface diffuser 28 like that of the scoop 24 in the reverse direction. In the embodiment shown in Figure 1, the diffuser 28 is identical to the scoop 24 making the hooded section 18 symmetrical at a midpoint on the middle section 26. The diffuser 28 thus has a concave surface 38 extending from the exit 36 to a parallel arranged surface 40 at the distal end 42.
The hooded section 18 will be effective for any rotor arrangement fitted into the middle section 26. An optimum arrangement is now described with reference to Figures 1 and 2. Due to the additional support for the rotor 12 within the hood 18, we can use a large number of blades. In this embodiment six blades are selected. The design of the blades 16 is chosen to provide the best aerodynamics to the rotor 12. In this way the entire rotor is selected based on number of blades; rotor solidity; pitch of blade; and tip speed ratio. In the embodiment described we have selected six blades with an airfoil SD2030. This airfoil is known for use in small wind turbines. This airfoil has quite a low drag which is achieved by having a long transition ramp, or bubble ramp' that leads to a thin laminar separation bubble. This airfoil also has an acceptable acoustics performance in terms of trailing edge noise; weighted overall trailing edge noise, and overall inflow turbulence noise. It will be appreciated by those skilled in the art that other airfoils may be selected with similar properties.
The rotor 12 also comprises a nose cone 44 and a nacelle 46. The nose cone 44 points into the wind direction while the nacelle 46 is used to cover the generator 14 by providing a streamlined holder. As these components Sit in the air flow their design can have a major effect on output power.
The inventors tested a number of designs and an illustration of some is shown in Figure 2. Figure 2(a) provides a pointed nose cone coupled to a parabola shaped nacelle; Figure 2(b) illustrates a pointed noise cone coupled to a tangent ogive nacelle; Figure 2(c) illustrates a pointed noise cone coupled to a secant ogive nacelle; and Figure 2(d) illustrates a rounded noise cone coupled to an ellipse shaped nacelle. It will be appreciated that other combinations may be used. In the embodiment described, the design illustrated in Figure 2(d) created the greatest power output and is thus the preferred arrangement.
The rotor blades 16 extend to near the inner surface 20 in order to exploit the maximum air flow through the turbine 10. Naturally the diameter of the nose 44 and nacelle 46 should be selected to be as small as possible to achieve this. However, the space created by the nose 44 and nacelle 46 needs to accommodate the generator 14. Of course a larger generator is more efficient at producing electricity. Accordingly a trade-off must be made between aerodynamics and electricity to achieve the optimum performance of the rotor as a whole.
In use, the turbine 1 0 is located on a mount or building in a built-up area.
A vane or other arrangement located on the turbine 10 will turn the turbine into the direction of the wind. The scoop 24 is thus pointed in the direction of the air flow along the central axis 33. The scoop 24 has a large diameter collection area which creates a funnelling effect and draws the air into the middle section 26 while increasing its acceleration.
The rotor blades 16 are located near the entrance 34 of the middle section 26. In the embodiment shown the rotor blades are located approximately a quarter of the way into the middle section 26. In this arrangement, the concave entry 32 on scoop 24 increases the air speed at the tips of the rotor blades and provides a reduced turbulence at the rotor 12. This increased air speed at the blades 16 both assists in starting the blades and increases the power output from the blades to the generator 14.
The small parallel section at the distal end 30 of the scoop 24 helps prevent turbulence at the entrance of the scoop 24 as it is aligned with the wind direction and so produces a streamlined effect. In addition the smooth inner surface 20 having negligible discontinuities also prevents additional turbulence within the hood 18 and thus assists in maintaining an accelerated air speed at the rotor blades 16.
The diffuser 28 minimises the effects of wakes after the rotor blades 16 and assists in drawing air through the hood 18 by creating a low pressure area after the rotor. In the embodiment described it is noted that the diffuser 28 is a significant distance from the rotor 12 caused by the positioning of the rotor in the cylindrical section 26. The channel created behind the rotor blades which is comparable in diameter to the blade span assists in maintaining the increased air speed through the turbine.
In computer simulations of the embodiment described a significant power increase was calculated over a turbine having the same rotor design and dimensions but not including the hood.
Reference is now made to Figure 3 of the drawings which illustrates a turbine, generally indicated by reference numeral lOa, according to a further embodiment of the present invention. Like parts to those of the turbine in Figure 1 have been given the same reference numeral but are suffixed a. Turbine lOa comprises a hood section 18a including a scoop 24a, middle cylindrical section 26a and diffuser 28a. Located at an entrance 34a of the middle section 26a is a rotor 12a.
In this embodiment the scoop 24a, middle section 26a and rotor 12a are as described with reference to Figure 1. Diffuser 28a is, however, now much larger. it is still set at the exit 36a of the middle section 26a and has a concave surface 38a extending radially from the exit 36a to a parallel surface 40a describing a cylinder on the central axis 33a. The diameter of the diffuser 28a is now approximately twice as large as the diameter of the scoop 24a as measured at the distal ends 42a,30a respectively. It is noted that the depth of the diffuser 28a is approximately the same as the depth of the scoop 24a. This embodiment has been calculated to provide an increased power output over the first embodiment.
The principal advantage of the present invention is that it provides a wind turbine for use in built up areas with an increased output power compared to turbines having the same rotors.
A further advantage of the present invention is that it provides a wind turbine which provides improved stability to rotors with an increased number of blades due to the hood arrangement over the rotor.
A yet further advantage of the present invention is that it provides a wind turbine which is of relatively simple construction as there are no apertures or other arrangements on the hood.
Various modifications may be made to the invention herein described without departing from the scope thereof. For example, any rotor may be selected with any number of blades to locate within the middle section.
The dimensions of the scoop, diffuser and middle section may be varied from those described provided they still remain with the relative constraints claimed.

Claims (28)

- CLAIMS
1. A wind turbine for use in built-up areas, the turbine comprising a rotor having a plurality of rotor blades arranged to turn upon incident wind thereupon, characterised in that the turbine further comprises: a tubular member, in which is located the rotor and rotor blades; a scoop, the scoop being located at a first end of the tubular member and having a concave inner surface; and a diffuser, the diffuser being located at an opposing end of the tubular member and having a radially extending inner surface.
2. A wind turbine as claimed in claim 1 wherein the turbine is a small scale wind turbine having an outer diameter between approximately im and 1.5m.
3. A wind turbine as claimed in claim 1 or claim 2 wherein the diffuser has a convex inner surface.
4. A wind turbine as claimed in claim 1 or claim 2 wherein the diffuser has a concave inner surface in an opposite direction to that of the scoop.
5. A wind turbine as claimed in any preceding claim wherein the tubular member is at least three times the length of the rotor.
6. A wind turbine as claimed in any preceding claim wherein the scoop has a continuous smooth inner surface.
7. A wind turbine as claimed in any preceding claim wherein the scoop has a depth along a central axis of the turbine which is less than the length of the tubular member arranged on the central axis.
8. A wind turbine as claimed in any preceding claim wherein the scoop has a diameter at a distal end greater than or equal to the combined depth of the scoop and length of the tubular member.
9. A wind turbine as claimed in claims 1 to 7 wherein the scoop has an outer diameter at the distal end which is approximately twice the diameter of the tubular member.
10.A wind turbine as claimed in any preceding claim wherein the scoop has an inner surface at the distal end which is substantially parallel to an inner surface of the tubular member.
11.A wind turbine as claimed in claim 1 any proceeding claim wherein the diffuser has a continuous smooth inner surface.
12.A wind turbine as claimed in any preceding claim wherein the diffuser has a depth along a central axis of the turbine which is less than the length of the tubular member arranged on the central axis.
13.A wind turbine as claimed in any preceding claim wherein the diffuser has a diameter at a distal end greater than or equal to the combined depth of the diffuser and length of the tubular member.
14.A wind turbine as claimed in any one of claims ito 12 wherein the diffuser has an outer diameter at the distal end which is approximately twice the diameter of the tubular section.
15.A wind turbine as claimed in any preceding claim wherein the diffuser has an inner surface at the distal end which is substantially parallel to an inner surface of the tubular member.
16.A wind turbine as claimed in any preceding claim the scoop and diffuser are symmetrical about the tubular member.
17.A wind turbine as claimed in any preceding claim wherein the scoop and the diffuser have approximately the same inner surface profiles.
18.A wind turbine as claimed in any preceding claim wherein the scoop and diffuser have approximately the same dimensions.
19.A wind turbine as claimed in any one of claims ito 17 wherein the diffuser extends to a larger diameter than the scoop.
20. A wind turbine as claimed in any preceding claim wherein the span of the rotor blades substantially extends across the inner diameter of the tubular member.
21.A wind turbine as claimed in any preceding claim wherein the rotor blades are arranged closer to the scoop than the diffuser.
22.A wind turbine as claimed in any preceding claim wherein there are six rotor blades.
23.A wind turbine as claimed in any preceding claim wherein the blades are Airfoil SD2030.
24.A wind turbine as claimed in any preceding claim wherein the rotor has a nose cone and/or a nacelle.
25.A wind turbine as claimed in 24 wherein the nose cone is rounded or pointed.
26.A wind turbine as claimed in claim 24 or claim 25 wherein the nacelle is a parabola, tangent ogive or ellipse profile.
27.A wind turbine as claimed in any one of claims 24 to 26 wherein the diameter of the nose cone and/or nacelle is less than a third of the inner diameter of the tubular member.
28. A wind turbine as claimed in any one of claims 24 to 27 wherein the nose cone is rounded and the nacelle is a section of an ellipse.
GB0712726A 2007-07-02 2007-07-02 Windturbine in a built-up area Withdrawn GB2450684A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0712726A GB2450684A (en) 2007-07-02 2007-07-02 Windturbine in a built-up area

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0712726A GB2450684A (en) 2007-07-02 2007-07-02 Windturbine in a built-up area

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GB0712726D0 GB0712726D0 (en) 2007-08-08
GB2450684A true GB2450684A (en) 2009-01-07

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009141155A2 (en) * 2008-05-22 2009-11-26 Hermann Rich Poppe Energy generation device comprising rotors
WO2009146557A1 (en) * 2008-06-05 2009-12-10 Organoworld Inc. Turbine apparatus
WO2010090543A3 (en) * 2009-02-06 2011-05-26 Nenad Paunovic Housing for hydro and aero turbines
AT515392A1 (en) * 2014-01-09 2015-08-15 Mehmet Dipl Ing Fh Demirel Back pressure pinwheel
CN107061141A (en) * 2017-05-23 2017-08-18 邓三益 A kind of wind-driven generator provided with siphon air channel
PL443161A1 (en) * 2022-12-15 2023-10-09 Jerzy Kukla Wind turbine with a horizontal axis of rotation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021135A (en) * 1975-10-09 1977-05-03 Pedersen Nicholas F Wind turbine
FR2491557A1 (en) * 1980-10-07 1982-04-09 Boucher Gerard Wind powered electricity generator - includes turbine in channel with flared outlet in which flaring of cone is varied in accordance with wind speed
US6710468B1 (en) * 1999-11-23 2004-03-23 Marrero O'shanahan Pedro M. Flow accelerating wind tower
JP2004169630A (en) * 2002-11-20 2004-06-17 Hikoshichi Takahashi Wind power generator for bicycle, and bicycle with wind power generator
US20040183310A1 (en) * 2003-03-19 2004-09-23 Jack Mowll Mowll-Bernoulli wind power generator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021135A (en) * 1975-10-09 1977-05-03 Pedersen Nicholas F Wind turbine
FR2491557A1 (en) * 1980-10-07 1982-04-09 Boucher Gerard Wind powered electricity generator - includes turbine in channel with flared outlet in which flaring of cone is varied in accordance with wind speed
US6710468B1 (en) * 1999-11-23 2004-03-23 Marrero O'shanahan Pedro M. Flow accelerating wind tower
JP2004169630A (en) * 2002-11-20 2004-06-17 Hikoshichi Takahashi Wind power generator for bicycle, and bicycle with wind power generator
US20040183310A1 (en) * 2003-03-19 2004-09-23 Jack Mowll Mowll-Bernoulli wind power generator

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009141155A2 (en) * 2008-05-22 2009-11-26 Hermann Rich Poppe Energy generation device comprising rotors
WO2009141155A3 (en) * 2008-05-22 2010-12-23 Hermann Rich Poppe Energy generation device comprising rotors
WO2009146557A1 (en) * 2008-06-05 2009-12-10 Organoworld Inc. Turbine apparatus
US8821117B2 (en) 2008-06-05 2014-09-02 Organoworld Inc. Turbine apparatus
WO2010090543A3 (en) * 2009-02-06 2011-05-26 Nenad Paunovic Housing for hydro and aero turbines
AT515392A1 (en) * 2014-01-09 2015-08-15 Mehmet Dipl Ing Fh Demirel Back pressure pinwheel
AT515392B1 (en) * 2014-01-09 2016-03-15 Mehmet Dipl Ing Fh Demirel Back pressure pinwheel
CN107061141A (en) * 2017-05-23 2017-08-18 邓三益 A kind of wind-driven generator provided with siphon air channel
PL443161A1 (en) * 2022-12-15 2023-10-09 Jerzy Kukla Wind turbine with a horizontal axis of rotation

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