GB2353825A - Wind turbine tower having rotatable shroud/fairing - Google Patents

Wind turbine tower having rotatable shroud/fairing Download PDF

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Publication number
GB2353825A
GB2353825A GB9920611A GB9920611A GB2353825A GB 2353825 A GB2353825 A GB 2353825A GB 9920611 A GB9920611 A GB 9920611A GB 9920611 A GB9920611 A GB 9920611A GB 2353825 A GB2353825 A GB 2353825A
Authority
GB
United Kingdom
Prior art keywords
shroud
tower
airflow
wind turbine
noise
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Withdrawn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
GB9920611A
Other versions
GB9920611D0 (en
Inventor
David Lovett Ewbank Teal
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 GB9920611A priority Critical patent/GB2353825A/en
Publication of GB9920611D0 publication Critical patent/GB9920611D0/en
Publication of GB2353825A publication Critical patent/GB2353825A/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Withdrawn legal-status Critical Current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
    • F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
    • F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
    • 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
    • F05B2240/14—Casings, housings, nacelles, gondels or the like, protecting or supporting assemblies there within
    • 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
    • F05B2250/40—Movement of component
    • F05B2250/41—Movement of component with one degree of freedom
    • F05B2250/411—Movement of component with one degree of freedom in rotation
    • 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
    • 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
    • F05B2260/00—Function
    • F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05B2260/78—Adjusting of angle of incidence or attack of rotating blades the adjusting mechanism driven or triggered by aerodynamic forces
    • 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
    • F05B2260/00—Function
    • F05B2260/96—Preventing, counteracting or reducing vibration or noise
    • 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
    • Y02E10/728—Onshore wind turbines

Abstract

A shroud or fairing 1, surrounds the tower 3, of a wind turbine, is attached to a nacelle2, and is free to rotate about the tower axis. The shroud is shaped (figure 1) such that approaching airflow is deflected to one side of the tower. Turbine blades 4, passing through the deflected airflow upwind of the tower, are less subject to undesirable, noise-producing angles of attack.

Description

2353825 WIND TURBINE NOISE REDUCER This invention relates to a way of
modifying the support towers of horizontal axis wind turbines so as to reduce the noise produced each time a rotor blade passes it.
Horizontal axis wind turbines produce noise in several ways. Most of these sources emit sound at relatively high frequencies, which are quickly attenuated. Noise produced as each rotor blade passes through the zone of airflow disturbed by the presence of the support tower, however, contains low-frequency components which are less rapidly attenuated and can be a nuisance to people living, working or relaxing nearby. Airflow in the zone upstream of the tower is influenced both by the tower and by the rotor blades. These influences are superposed on natural wind variability.
An object of this invention is to modify the pattern of airflow around the tower in such a way as to avoid a rapid increase in the angle of attack experienced by the blades passing through it. In this way, transient stalling or incipient stalling and associated turbulent wake enIargenent may be avoided.
Accordingly, this invention provides a full or partial shroud or fairing around the circularsectioned tower, so shaped as to cause approaching airflow to be deflected more to one side than the other. This shroud is free to rotate about the vertical axis of the tower and is fixed to the turbine nacelle such that it will rotate with it as it yaws to face the wind direction.
Preferably the shroud is made of corrugated metal or plastic sheeting, but it may instead be made from glass reinforced plastic mouldings or other material according to cost and durability requirements.
A preferred embodiment of the invention will now be described with reference to the accompanying drawing.
FIGURE 1 shows the airflow streamlines around a tower with and without a shroud.
FIGURE 2 shows the effect of varying the rotor blade angle of attack.
FIGURE 3 shows a side view of a wind turbine with shroud attached.
As shown in Figure 1, the airflow approaching a tower without a shroud presents varying angles to the path of the blade, 4. This variation results in the angle of attack, a, becoming successively less than, greater than and then once again equal to the angle of attack experienced for the remainder of the blade's revolution. In contrast, airflow approaching a tower with a shroud is deflected as indicated by the streamlines, 7. In this case, the angle of attack is always less than or equal to the angle experienced for the remainder of the revolution. thus avoiding incipient or actual transient stalled conditions. i Figure 2 shows how the change in airflow approach angle affects the angle of attack, cc.
As shown in Figure 3, the shroud, 1, is wed to and supported from the nacelle, 2. It is fre( rotate about the vertical axis of the tower, 3, while being held steady by bands, 5, of low-f material spaced at intervals up the towe'r, 3. The rotor blades, 4, rotate a short distance of the shrouded tower, 3. The access doorway, 6, is unimpeded.
2

Claims (7)

1 A shroud or fairing around a wind turbine tower, attached to the nacelle and free to rotate about the tower axis.
2. A shroud as claimed in Claim 1 where the profile is so shaped as to deflect the airflow to one side of the tower.
3. A shroud as claimed in Claim 2 where the deflection of the airflow prevents the turbine rotor blades from experiencing excessive angles of attack.
4. A shroud as claimed in Claim 3 where reduced noise is produced.
5. A shroud as claimed in Claim 3 where less periodic fluctuation in noise is produced.
6. A shroud as claimed in Claim 1 or Claim 2 which is made from corrugated or otherwise profiled metal or plastic sheeting.
7. A shroud substantially as herein described and illustrated in the accompanying drawings 1
7. A shroud as claimed in Claim 1 or Claim 2 which is made from glass reinforced plastic mouldings.
8. A shroud substantially as herein described and illustrated in the accompanying drawings.
Amendments to the claims have been filed as follows CLAIMS 1. A shroud or fairing around the tower of a horizontal axis wind turbine, attached to the nacelle and free to rotate about the tower axis, and so shaped as to deflect the approaching airflow to one side of the tower, against the direction of approaching rotor blades. - 2. A shroud as claimed in Claim 1 where the deflection of the airflow is such that the moving rotor blades largely avoid experiencing transient increases in their angle of attack as they pass the tower.
3. A shroud as claimed in Claim 2 which has the effect of reducing noise emission. 4. A shroud as claimed in Claim 2 where the periodic fluctuation in noise at blade-passing frequency is reduced.
5. A shroud as claimed in Claim 1 or Claim 2 which is made from corrugated or otherwise stiffened metal Or plastic sheeting.
6. A shroud as claimed in Claim 1 or Claim 2 which is made from glass reinforced plastic mouldings.
GB9920611A 1999-09-01 1999-09-01 Wind turbine tower having rotatable shroud/fairing Withdrawn GB2353825A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9920611A GB2353825A (en) 1999-09-01 1999-09-01 Wind turbine tower having rotatable shroud/fairing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9920611A GB2353825A (en) 1999-09-01 1999-09-01 Wind turbine tower having rotatable shroud/fairing

Publications (2)

Publication Number Publication Date
GB9920611D0 GB9920611D0 (en) 1999-11-03
GB2353825A true GB2353825A (en) 2001-03-07

Family

ID=10860122

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9920611A Withdrawn GB2353825A (en) 1999-09-01 1999-09-01 Wind turbine tower having rotatable shroud/fairing

Country Status (1)

Country Link
GB (1) GB2353825A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1515040A1 (en) * 2003-09-10 2005-03-16 General Electric Company Wind turbine with outer noise shell
WO2010088933A2 (en) * 2009-02-06 2010-08-12 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Wind power plant having streamlined profiling
CN102235320A (en) * 2010-04-21 2011-11-09 西门子公司 Wall section for a wind turbine tower and wind turbine tower
EP2436924A1 (en) * 2010-10-01 2012-04-04 Thompson Adrian Wind turbine appartus
GB2484962A (en) * 2010-10-28 2012-05-02 Calsand Ltd Shroud or fairing for window turbine
WO2012156352A1 (en) * 2011-05-18 2012-11-22 Dipl.-Ing. Werner Nophut Gmbh Wind turbine system
CN111237137A (en) * 2020-02-25 2020-06-05 扬州大学 Noise reduction device mounted on tower of wind turbine and wind turbine
US11466660B2 (en) * 2011-06-21 2022-10-11 University Of Virginia Patent Foundation Morphing segmented wind turbine and related method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB758628A (en) * 1953-12-23 1956-10-03 Rudolf Arnold Erren A wind-power installation
GB780381A (en) * 1954-03-01 1957-07-31 Havilland Propellers Ltd De Improvements in and relating to anemo-electric power plants
GB2083564A (en) * 1980-09-09 1982-03-24 Mewburn Crook Anthony James Se An Improved Wind Energy Convertor
WO1991004413A1 (en) * 1988-03-23 1991-04-04 Ivar Holmgren Wind power plant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB758628A (en) * 1953-12-23 1956-10-03 Rudolf Arnold Erren A wind-power installation
GB780381A (en) * 1954-03-01 1957-07-31 Havilland Propellers Ltd De Improvements in and relating to anemo-electric power plants
GB2083564A (en) * 1980-09-09 1982-03-24 Mewburn Crook Anthony James Se An Improved Wind Energy Convertor
WO1991004413A1 (en) * 1988-03-23 1991-04-04 Ivar Holmgren Wind power plant

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1515040A1 (en) * 2003-09-10 2005-03-16 General Electric Company Wind turbine with outer noise shell
CN100373047C (en) * 2003-09-10 2008-03-05 通用电气公司 Wind urbine with outer noise shell
WO2010088933A2 (en) * 2009-02-06 2010-08-12 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Wind power plant having streamlined profiling
WO2010088933A3 (en) * 2009-02-06 2011-05-26 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Wind power plant having streamlined profiling
DE102009007812B4 (en) 2009-02-06 2019-05-02 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Wind turbine with wind-slip profiling
CN102235320B (en) * 2010-04-21 2016-03-23 西门子公司 For wall section and the wind turbine tower of wind turbine tower
US8938933B2 (en) 2010-04-21 2015-01-27 Siemens Aktiengesellschaft Wall section for a wind turbine tower and wind turbine tower
CN102235320A (en) * 2010-04-21 2011-11-09 西门子公司 Wall section for a wind turbine tower and wind turbine tower
EP2436924A1 (en) * 2010-10-01 2012-04-04 Thompson Adrian Wind turbine appartus
GB2484962A (en) * 2010-10-28 2012-05-02 Calsand Ltd Shroud or fairing for window turbine
WO2012156352A1 (en) * 2011-05-18 2012-11-22 Dipl.-Ing. Werner Nophut Gmbh Wind turbine system
US11466660B2 (en) * 2011-06-21 2022-10-11 University Of Virginia Patent Foundation Morphing segmented wind turbine and related method
CN111237137A (en) * 2020-02-25 2020-06-05 扬州大学 Noise reduction device mounted on tower of wind turbine and wind turbine

Also Published As

Publication number Publication date
GB9920611D0 (en) 1999-11-03

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)