CN101705900A - Novel blade used for ocean current power generation turbine - Google Patents
Novel blade used for ocean current power generation turbine Download PDFInfo
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- CN101705900A CN101705900A CN200910154589A CN200910154589A CN101705900A CN 101705900 A CN101705900 A CN 101705900A CN 200910154589 A CN200910154589 A CN 200910154589A CN 200910154589 A CN200910154589 A CN 200910154589A CN 101705900 A CN101705900 A CN 101705900A
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- blade
- turbine
- wing root
- power generation
- ocean current
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- 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
- Y02E10/20—Hydro energy
Abstract
The invention provides a novel blade used for an ocean current power generation turbine. The blade comprises a wing root close to a turbine rotor and a wing tip far away from the rotor; the transverse section of the blade is of an NACA series airfoil type; and the chord length of the blade continuously changes from big to small from the wing root to the wing tip, and the thickness of the blade gradually becomes smaller from the wing root to the wing tip. The blade has the advantages of small deadweight, and high turbine efficiency, and can make the turbine get high rotary speed just by low-flow rate sea water, and avoid the cavitation erosion when the turbine rotates at a high speed.
Description
Technical field
The present invention relates to a kind of blade of turbo machine, particularly a kind of blade that is used for ocean current power generation turbine.
Technical background
Energy by ocean current is cleaning, renewable energy sources, adopts the generating of energy by ocean current technology, helps improving energy resource structure, reduces environmental pollution and weather variation issue that fossil energy consumption brings.Energy by ocean current is a kind of energy of the easiest acquisition in the ocean energy, tool flexibility.Ocean current power generation turbine is exactly by the flowing of seawater, and promotes turbo machine and rotates, and the kinetic energy of seawater is transformed into the mechanical energy of turbo machine.Wherein, the efficient of turbo machine, cavitation performance and stability are three important indicators that influence the generator set performance.
Cavitation is the distinctive a kind of physical phenomenon of working fluid, and it is a kind of hydrodynamic phenomenon that produces cavity when being lower than pressure for vaporization under this temperature because of local compression in the liquid, and the cavitation cavitation in the hydraulic machinery can have serious consequences.Cavitation can cause flowing instability, produces high vibration and noise, reduces its hydraulic performance, makes material surface produce cavitation erosion, reduces working life.In turbine operation, usually extent of cavitation also be not enough to the turbine rotor characteristic produced can survey influence before, cavitation just begins.Because the current in the hydraulic machinery are more complicated, cavitation phenomenon can appear at different positions and form cavitation under different condition, in the turbine disc runner and on the local surfaces of its flow passage components, tends to take place cavitation and then causes cavitation corrosion.Slight only forms a small amount of erosion point at blade surface, and the metallic material in serious blade cavitation corrosion district is degraded in a large number, causes the surface to become cellular, even the phenomenon that makes the blade perforation or fall the limit is arranged, and the safe operation of unit in serious threat.
The dimensional airfoil section of chord lengths such as existing turbine bucket employing, equal thickness, this two-dimentional blade from great, the energy that seawater promotes blade rotation consumption is big, it is low to cause turbo machine seawater kinetic energy to be converted into the efficient of mechanical energy, and the seawater that needs high flow rate just can make turbo machine obtain high rotating speed, and cavitation and cavitation erosion takes place blade easily.
Summary of the invention
For the blade that overcomes prior art from great, the efficient that turbo machine seawater kinetic energy is converted into mechanical energy is low, need the seawater of high flow rate just can make turbo machine obtain high rotating speed, the shortcoming of cavitation and cavitation erosion takes place in blade easily, the present invention proposes that the deadweight of a kind of blade is little, the efficient height of turbo machine, cavitation and cavitation erosion does not take place, and only needs low flow velocity seawater can make turbo machine obtain the high-revolving blade that is used for ocean current power generation turbine.
A kind of novel blade that is used for ocean current power generation turbine, described blade comprise that NACA series aerofoil profile is adopted in the cross section of described blade near the wing root of turbine rotor with away from the wingtip of described rotor; It is characterized in that: the chord length of described blade along the wing root of blade to the descending continuous variation of wingtip, the thickness of blade from the wing root of blade to wingtip attenuation gradually.
Further, described vane trailing edge elliptic curve of recessed 1/4 before being, the leading edge of described blade is straight.
Further, the length ratio of the wingtip of described blade and wing root is 1: 3.
Design of the present invention is: with blade from wing root to the wingtip chord length shorten gradually, thickness attenuation gradually, dwindled blade volume, alleviated the blade deadweight, improved turbo machine and changed seawater kinetic energy the efficient of mechanical energy into, even seawater velocity is lower, turbo machine also can obtain high rotating speed.
Trailing edge along wing root to the direction of wingtip, according to 1/4 elliptic curve convergent, make the area of passage of blade reduce over half, the area of passage of blade is more little, wrap up fully in the hole that then blade is easier when being taken place by supercavitation, because of the position that cavitation and cavitation corrosion take place different, thereby avoid high rotating speed lower blade surface by cavitation corrosion.
The present invention has that blade deadweight is little, the efficient height of turbo machine, and it is high-revolving only to need low flow velocity seawater that turbo machine is obtained, and avoids turbo machine blade generation cavitation corrosion when high rotating speed.
Description of drawings
Fig. 1 is a schematic perspective view of the present invention
Fig. 2 is a schematic cross section of the present invention
Fig. 3 is a longitudinal section of the present invention schematic representation
Fig. 4 draws the graph of a relation of seawater velocity and turbine speeds for adopting embodiment two
Fig. 5 is the turbine speeds that adopts embodiment two and draw and the graph of a relation of cavitation number
Embodiment
Embodiment one
With reference to Fig. 1-3
A kind of novel blade that is used for ocean current power generation turbine, described blade 1 comprise that NACA series aerofoil profile is adopted in the cross section of described blade 1 near the wing root 11 of turbine rotor with away from the wingtip 12 of described rotor; It is characterized in that: the chord length of described blade 1 shortens to wingtip 12 gradually along the wing root 11 of blade, the thickness of blade 1 along wing root to wingtip attenuation gradually.
The leading edge of described blade 1 is straight 13, and the trailing edge 14 of described blade 1 is preceding recessed 1/4th elliptic curve.
The wingtip 12 of described blade 1 is 1 with the length ratio of wing root 11: 3.
Design of the present invention is: with blade 1 along wing root 11 to wingtip 12 chord lengths 15 shorten gradually, thickness attenuation gradually, dwindled blade 1 volume, alleviated blade 1 deadweight, improved the efficient that turbo machine changes seawater kinetic energy into mechanical energy, even seawater velocity is lower, turbo machine also can obtain high rotating speed.
Embodiment two
With reference to Fig. 4,5,, present embodiment is described in conjunction with actual conditions:
Below be unit 1 with aerofoil profile chord length c, the specific embodiment of the present invention is further described.
The NACA4415 aerofoil profile is adopted in the cross section of blade, and maximum camber f is 4% of a chord length, maximum camber position x
fFrom leading edge is 40% of chord length, and maximum ga(u)ge d is 15% of a chord length.
It is 1: 3 oval aerofoil profile that blade adopts on the longitudinal section length ratio of wingtip and wing root, and wingtip length a is about 0.333, and wing root length b is 1, and leading edge 1 is a vertical line, and trailing edge transition line 2 is 1/4th elliptic curves
Test shows, when adopting the dimensional airfoil section blade of chord length such as existing, equal thickness, the average transformation efficiency that turbo machine is converted into mechanical energy with seawater kinetic energy is 37%. when adopting blade of the present invention, turbo machine can reach the maximum conversion efficient that seawater kinetic energy is converted into mechanical energy at 56%, and average transformation efficiency is 45%.
The described content of this specification embodiment only is enumerating the way of realization of inventive concept; protection scope of the present invention should not be regarded as only limiting to the concrete form that embodiment states, protection scope of the present invention also reach in those skilled in the art conceive according to the present invention the equivalent technologies means that can expect.
Claims (3)
1. novel blade that is used for ocean current power generation turbine, described blade comprise that NACA series aerofoil profile is adopted in the cross section of described blade near the wing root of turbine rotor with away from the wingtip of described rotor; It is characterized in that: the chord length of described blade along the wing root of blade to the descending continuous variation of wingtip, the thickness of blade along the wing root of blade to wingtip attenuation gradually.
2. a kind of novel blade that is used for ocean current power generation turbine as claimed in claim 1 is characterized in that: described vane trailing edge elliptic curve of recessed 1/4 before being, described blade inlet edge is straight.
3. a kind of novel blade that is used for ocean current power generation turbine as claimed in claim 1 or 2, it is characterized in that: the wingtip of described blade and the length ratio of wing root are 1: 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910154589XA CN101705900B (en) | 2009-11-13 | 2009-11-13 | Novel blade used for ocean current power generation turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910154589XA CN101705900B (en) | 2009-11-13 | 2009-11-13 | Novel blade used for ocean current power generation turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101705900A true CN101705900A (en) | 2010-05-12 |
| CN101705900B CN101705900B (en) | 2012-02-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910154589XA Active CN101705900B (en) | 2009-11-13 | 2009-11-13 | Novel blade used for ocean current power generation turbine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012059017A1 (en) * | 2010-11-01 | 2012-05-10 | 上海奇谋能源技术开发有限公司 | Method and apparatus for utilizing tidal energy |
| CN107300456A (en) * | 2017-07-06 | 2017-10-27 | 中国人民解放军国防科学技术大学 | A kind of supercavity experimental rig and test method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK176317B1 (en) * | 2005-10-17 | 2007-07-30 | Lm Glasfiber As | Blade for a rotor on a wind turbine |
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2009
- 2009-11-13 CN CN200910154589XA patent/CN101705900B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012059017A1 (en) * | 2010-11-01 | 2012-05-10 | 上海奇谋能源技术开发有限公司 | Method and apparatus for utilizing tidal energy |
| CN107300456A (en) * | 2017-07-06 | 2017-10-27 | 中国人民解放军国防科学技术大学 | A kind of supercavity experimental rig and test method |
| CN107300456B (en) * | 2017-07-06 | 2019-04-12 | 中国人民解放军国防科学技术大学 | A kind of supercavity experimental rig and test method |
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| Publication number | Publication date |
|---|---|
| CN101705900B (en) | 2012-02-29 |
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