CN103174604A - Small-size wind turbine blade airfoil family - Google Patents
Small-size wind turbine blade airfoil family Download PDFInfo
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- CN103174604A CN103174604A CN2011104431883A CN201110443188A CN103174604A CN 103174604 A CN103174604 A CN 103174604A CN 2011104431883 A CN2011104431883 A CN 2011104431883A CN 201110443188 A CN201110443188 A CN 201110443188A CN 103174604 A CN103174604 A CN 103174604A
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Abstract
The invention discloses a small-size wind turbine blade airfoil family. Each airfoil comprises a front edge, a front edge upper side edge, a front edge side upper transition arc, a suction force side, a rear edge side upper transition arc, a rear edge upper side edge, a rear edge and a pressure side which are connected in sequence. The front edge side upper transition arc is arranged above the front edge and close to 0%-25% of the chord length of the front edge, and the length of the front edge side upper transition arc is 0%-19.6% of the chord length. The rear edge side upper transition arc is arranged above the rear edge and close to 0%-25% of the chord length of the rear edge, and the length of the rear edge side upper transition arc is 0%-19.6% of chord length. The relative thickness of the airfoil is 5%-25%, and the largest relative thickness is located at a position close to 0%-50% of the chord length of the front edge. The small-size wind turbine blade airfoil family is provided with a small zero lifting angle and a large stall angle. After stall, great lifting force still can be provided in a large attack angle. A wind turbine with the airfoil family has the advantages that wind energy conversion efficiency is high within a long range, and low starting wind speed is realized.
Description
Technical field
The present invention relates to the small wind turbine technical field, be specifically related to be applied to the aerofoil profile structure family of Miniature Wind Turbine Blades inboard.
Background technique
Aerofoil profile refers to the cross section of pneumatic equipment blades made, and the blade inboard refers to that blade is near a side of root of blade.
It is not to aim at the wind energy conversion system design that conventional aerofoil profile is generally Flight Vehicle Design, and conventional aerofoil profile work angle of attack scope is generally all narrower, and namely angle of zero lift is large, stalling incidence is little, and after stall, lift is undesirable.Therefore adopt the wind energy conversion system of conventional airfoil fan design only to use rotating speed wind energy conversion efficiency in a shorter segment limit just higher, be difficult to utilize in higher efficiency wind energy when causing wind regime to change greatly always.In addition when wind speed hour, wind energy conversion system does not also rotate and during to good wind direction, do not adopt the wind energy conversion system that becomes the oar technology, at this time the work angle of attack of aerofoil profile is generally the scope of 40 °～90 °, conventional aerofoil profile is very low at this section angle of attack scope lift coefficient, so adopt the startup wind speed of conventional aerofoil profile wind energy conversion system higher, when causing wind speed low, wind energy can not be utilized.Small wind turbine often can be used in some monsoon zones, medium wind energy distributed areas and some other wind regime and change large zone, and these wind energy conversion systems design expectation rotating speeds wind energy conversion efficiency in long segment limit is all higher; Also expectation startup wind speed is less.
Because wind blade need to work long hours in the open air, can deposit the particles such as freezing or dust on blade outer surface, so wind energy conversion system design expectation aerofoil profile is more insensitive on the impact of pollution and roughness.
In addition, for the ease of installing, the root of small wind turbine generally is designed to rectangle or round rectangle, conventional aerofoil profile can't directly be connected the smooth connection of round rectangle with rectangle, may cause so the not smooth generation stress of root of blade to be concentrated and make blade strength impaired, and be difficult to calculate the Wind Power Utilization loss of leaf root part.For can be directly and blade root fastenings, custom-designed aerofoil profile need to be arranged.
Summary of the invention
The present invention is directed to the deficiency of conventional aerofoil profile on small wind turbine is used, a kind of family of aerofoil sections that is suitable for small wind turbine is provided; This purpose is realized by following technological scheme:
A kind of Miniature Wind Turbine Blades family of aerofoil sections is characterized in that: each aerofoil profile comprises the leading edge that connects by consecutive order, the leading edge upper side edge, and excessive arc on front edge side, suction side, excessive arc on the trailing edge side, the trailing edge upper side edge, trailing edge, on the pressure side; On described front edge side, excessive arc is positioned at the top near leading edge 0%～25% chord length, and on front edge side, the length of excessive arc is 0%～19.6% chord length; On described trailing edge side, excessive arc is positioned at the top near trailing edge 0%～25% chord length, and on the trailing edge side, the length of excessive arc is 0%～19.6% chord length; Relative thickness of airfoil is 5%～25%, and the maximum relative thickness position is near leading edge 0%～50% chord length place.
Described leading edge is for being roughly camber, and described leading edge upper side edge is the camber line straight than leading edge, length 0%～23% chord length.
On described front edge side, excessive arc is the excessive camber line of leading edge upper side edge and suction side, and on described trailing edge side, excessive arc is the excessive camber line of suction side and trailing edge upper side edge.
Described trailing edge upper side edge is more straight camber line, and length is 0%～23% chord length.
Described trailing edge is comprised of one first camber line and one second camber line angle, perhaps is comprised of the first camber line and the second tangential, is perhaps one section camber line or one section straight line.
The main feature of family of aerofoil sections of the present invention is: have less angle of zero lift, larger stalling incidence after stall, still can provide larger lift in the larger angle of attack, and positive lift coefficient is namely arranged in wider angular range.The wind energy conversion system of using family of aerofoil sections of the present invention has all higher characteristics of in long segment limit wind energy conversion efficiency.After stall, still can provide larger lift in the larger angle of attack, the wind energy conversion system of using family of aerofoil sections of the present invention has the low characteristics that start wind speed.
Description of drawings
The aerofoil profile of the family of aerofoil sections that Fig. 1 provides for embodiment.
The trailing edge of the aerofoil profile of the family of aerofoil sections that Fig. 2 provides for embodiment.
Several shapes that the aerofoil profile of the family of aerofoil sections that Fig. 3 provides for embodiment may occur.
Fig. 4 is existing aerofoil profile (before improving) and the wind energy conversion efficiency that adopts the present embodiment family of aerofoil sections (after improvement)-rotating speed contrast.
Fig. 5 is the startup wind speed contrast of existing aerofoil profile (before improving) and employing the present embodiment family of aerofoil sections (after improving).
Fig. 6 is existing aerofoil profile (before improving) and the wind energy conversion efficiency that adopts the present embodiment family of aerofoil sections (after improvement)-rotating speed contrast.
Embodiment
As shown in Figure 1, each aerofoil profile of the family of aerofoil sections that the present embodiment provides comprises the leading edge 101 that connects by consecutive order, leading edge upper side edge 102, excessive arc 103 on front edge side, suction side 104, excessive arc 105 on the trailing edge side, trailing edge upper side edge 106, trailing edge 107, on the pressure side 108.
It should be noted that the relative thickness of airfoil that the present embodiment provides is 5%～25%, the maximum relative thickness position is near leading edge 0%～50% chord length place.On front edge side, excessive arc 103 is positioned at the top near leading edge 0%～25% chord length, and on front edge side, the length of excessive arc 103 is 0%～19.6% chord length.On the trailing edge side, excessive arc 105 is positioned at the top near trailing edge 0%～25% chord length, and on the trailing edge side, the length of excessive arc 105 is 0%～19.6% chord length.
In addition, leading edge 101 is for being roughly camber, and leading edge upper side edge 102 is the camber line straight than leading edge 101, length 0%～23% chord length.On front edge side, excessive arc 103 is the excessive camber line of leading edge upper side edge 102 and suction side 104.Suction side 104 is the camber line of epirelief roughly.Also can be more straight slightly to recessed or suction surveys 104, for example on the close aerofoil profile of blade root of family of aerofoil sections of the present invention, as shown in Fig. 3 (a).On the trailing edge side, excessive arc 105 is the excessive camber line of suction side 104 and trailing edge upper side edge 106.Trailing edge upper side edge 106 is more straight camber line, and length is 0%～23% chord length.
On the pressure side 108 is the camber line of fovea superior roughly, also can be more straight or protruding slightly downwards, for example at family of aerofoil sections of the present invention near on the aerofoil profile of blade root and on the aerofoil profile near in blade or rear portion, as shown in Fig. 3 (a) and Fig. 3 (e).
On leading edge upper side edge 102, front edge side, excessively the curvature variation between arc 103, suction side 104, the upper excessive arc 105 of trailing edge survey, trailing edge upper side edge 106 each sections can be apparent in view, namely easily tell the differentiation between each section, as shown in Fig. 3 (a) and Fig. 3 (b).
On leading edge upper side edge 102, front edge side excessively arc 103, suction side 104, trailing edge survey between upper excessive arc 105, trailing edge upper side edge 106 each sections or the curvature between some section change can be not obvious, namely be not easy each section or some section and be similar to one section continuous camber line, as shown in Fig. 3 (c), Fig. 3 (d) and Fig. 3 (e).
Family of aerofoil sections of the present invention has less angle of zero lift, and larger stalling incidence after stall, still can provide larger lift in the larger angle of attack, and positive lift coefficient is namely arranged in wider angular range.The wind energy conversion system of using family of aerofoil sections of the present invention has all higher characteristics of in long segment limit wind energy conversion efficiency.After stall, still can provide larger lift in the larger angle of attack, the wind energy conversion system of using family of aerofoil sections of the present invention has the low characteristics that start wind speed.
Family of aerofoil sections of the present invention also has following characteristics:
Family of aerofoil sections of the present invention can directly be connected the smooth connection of root of blade of round rectangle with rectangle, avoid occurring root stress and concentrate, and is convenient to control and reduces the loss of root of blade wind energy.
The wind energy conversion system of using family of aerofoil sections of the present invention has all higher characteristics of in long segment limit wind energy conversion efficiency, sees Fig. 4.Can make wind energy conversion system like this and greatly also can keep higher Wind Power Utilization in the situation that wind regime changes.
The wind energy conversion system of using family of aerofoil sections of the present invention has the low wind speed characteristics that start, and sees Fig. 5.Can utilize wind energy under low wind friction velocity like this.
Less demanding due to family of aerofoil sections of the present invention to size, and adopt larger leading edge and the design of similar pair of leading edge, family of aerofoil sections of the present invention to pollute and the roughness condition more insensitive.The aerofoil profile that the present invention is bright and clean and coarse profile lift-angle of attack curve comparison is seen Fig. 6.Wind energy conversion system still can keep higher wind energy conversion efficiency in use for some time like this, subtracts the reduced-maintenance cost.
Some aerofoil profile of family of aerofoil sections of the present invention or family of aerofoil sections of the present invention can be carried out a large amount of changes and modification by those skilled in the art, and does not depart from general spirit and the scope of claims of the present invention and equivalent restriction.
Claims (5)
1. Miniature Wind Turbine Blades family of aerofoil sections is characterized in that: each aerofoil profile comprises the leading edge that connects by consecutive order, the leading edge upper side edge, and excessive arc on front edge side, suction side, excessive arc on the trailing edge side, the trailing edge upper side edge, trailing edge, on the pressure side; On described front edge side, excessive arc is positioned at the top near leading edge 0%～25% chord length, and on front edge side, the length of excessive arc is 0%～19.6% chord length; On described trailing edge side, excessive arc is positioned at the top near trailing edge 0%～25% chord length, and on the trailing edge side, the length of excessive arc is 0%～19.6% chord length; Relative thickness of airfoil is 5%～25%, and the maximum relative thickness position is near leading edge 0%～50% chord length place.
2. Miniature Wind Turbine Blades family of aerofoil sections according to claim 1, it is characterized in that: described leading edge is for being roughly camber, and described leading edge upper side edge is the camber line straight than leading edge, length 0%～23% chord length.
3. Miniature Wind Turbine Blades family of aerofoil sections according to claim 1 is characterized in that: on described front edge side excessively arc be the excessive camber line of leading edge upper side edge and suction side, on described trailing edge side excessively arc be the excessive camber line of suction side and trailing edge upper side edge.
4. Miniature Wind Turbine Blades family of aerofoil sections according to claim 1, it is characterized in that: described trailing edge upper side edge is more straight camber line, length is 0%～23% chord length.
5. Miniature Wind Turbine Blades family of aerofoil sections according to claim 1, it is characterized in that: described trailing edge is comprised of one first camber line and one second camber line angle, perhaps is comprised of the first camber line and the second tangential, is perhaps one section camber line or one section straight line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104431883A CN103174604A (en) | 2011-12-26 | 2011-12-26 | Small-size wind turbine blade airfoil family |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104431883A CN103174604A (en) | 2011-12-26 | 2011-12-26 | Small-size wind turbine blade airfoil family |
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| CN103174604A true CN103174604A (en) | 2013-06-26 |
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| CN2011104431883A Pending CN103174604A (en) | 2011-12-26 | 2011-12-26 | Small-size wind turbine blade airfoil family |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104819106A (en) * | 2015-04-30 | 2015-08-05 | 南京北大工道创新有限公司 | Wind turbine blade wing section group |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2517083A1 (en) * | 1974-04-19 | 1975-11-06 | James William Foster | PROPELLER |
| GB2246398A (en) * | 1990-07-26 | 1992-01-29 | Howden Wind Turbines Limited | Wind turbine blade and rotor incorporating same |
| EP1607624A2 (en) * | 2004-06-15 | 2005-12-21 | NORDEX ENERGY GmbH | Turbine blade for a wind turbine |
| WO2009105835A1 (en) * | 2008-02-28 | 2009-09-03 | Windworks Engineering Limited | An airfoil for a vertical axis wind turbine |
| US20090257884A1 (en) * | 2007-12-24 | 2009-10-15 | Clark Philip G | Wind turbine blade and assembly |
| CN102022259A (en) * | 2010-12-04 | 2011-04-20 | 河南科技大学 | Lift-to-drag blending wing plate type vertical axis wind wheel |
-
2011
- 2011-12-26 CN CN2011104431883A patent/CN103174604A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2517083A1 (en) * | 1974-04-19 | 1975-11-06 | James William Foster | PROPELLER |
| GB2246398A (en) * | 1990-07-26 | 1992-01-29 | Howden Wind Turbines Limited | Wind turbine blade and rotor incorporating same |
| EP1607624A2 (en) * | 2004-06-15 | 2005-12-21 | NORDEX ENERGY GmbH | Turbine blade for a wind turbine |
| US20090257884A1 (en) * | 2007-12-24 | 2009-10-15 | Clark Philip G | Wind turbine blade and assembly |
| WO2009105835A1 (en) * | 2008-02-28 | 2009-09-03 | Windworks Engineering Limited | An airfoil for a vertical axis wind turbine |
| CN102022259A (en) * | 2010-12-04 | 2011-04-20 | 河南科技大学 | Lift-to-drag blending wing plate type vertical axis wind wheel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104819106A (en) * | 2015-04-30 | 2015-08-05 | 南京北大工道创新有限公司 | Wind turbine blade wing section group |
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