CN102720622A - Vortex generator for turbine draft tube - Google Patents
Vortex generator for turbine draft tube Download PDFInfo
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- CN102720622A CN102720622A CN2012102097252A CN201210209725A CN102720622A CN 102720622 A CN102720622 A CN 102720622A CN 2012102097252 A CN2012102097252 A CN 2012102097252A CN 201210209725 A CN201210209725 A CN 201210209725A CN 102720622 A CN102720622 A CN 102720622A
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- draft tube
- turbine
- angled trapezium
- vortex generator
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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
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Abstract
The invention discloses a vortex generator for a turbine draft tube, which comprises a turbine draft tube and a plurality of metal blades uniformly arranged on the inner wall of the turbine draft tube, wherein the shape of each metal blade is a right-angled trapezoid; and each trapezoid-shaped blade has an upper bottom, a lower bottom, a height and an sloped edge. The vortex generator is characterized in that the height of the trapezoid serves as a mounting cross section which is fixed on the inner wall of the draft tube, the upper bottom is arranged on the side close to the water inlet of the draft tube, the lower bottom is arranged on the side away from the water inlet of the draft tube, the mounting cross section of the vortex generator is a cross section where the vortex appears inside the draft tube, and the two trapezoid-shaped blades in each pair of metal blades are used symmetrically and the planes where the two blades are located are symmetrical relative to the central axis. The vortex generator for the turbine draft tube has the advantages of simple structure, flexible installation and easily-available raw materials; and is applied to hydropower units with different types of water heads in different working conditions to increase the energy recovery coefficient of turbine draft tubes and improve the stability.
Description
Technical field
The present invention relates to a kind of Fluid Machinery and Engineering apparatus field, be specifically related to a kind of vortex generator that is applicable to multiple different operating mode turbine draft tubes.
Background technique
Vortex generator (Vortex Generators is called for short VG) is at first to be proposed by Taylor mid-term in 20th century, is the flow control apparatus that further improves aircraft steam-operating performance in the meticulous design of aircraft later stage.So vortex generator is applied to generally be mounted on the wing of aircraft in the aerodynamics the earliest.Common flat vortex generator all is to be vertically mounted in the aerofoil surface boundary layer, and keeps certain included angle with coming flow path direction.Its effect mainly contains: the trailing vortex that 1, produces through tablet stirs the air-flow in the separation zone, the high energy air-flow on top, boundary layer is mixed with the low energy air-flow of near wall, and then increase the kinetic energy and the energy of nearly wall fluid, to delay separation.2, the trailing vortex that utilizes vortex generator to produce intercepts internal gas flow to the flowing of outer wing, and prevents that the low energy air-flow from piling up on outer wing, thereby further increases lift and reduce resistance.
Through the development in century more than more than half, vortex generator is body and high lift device after aircraft, Diffuser, contraction, even has all obtained extensive use on the advanced fighter.After the sixties in last century; The researcher studies the heat-transfer character of vortex generator; Up to now; Scholar both domestic and external is to the existing more deep research of its application in thermal conduction study, and the heat-transfer character of shape vortex generators such as diabolo vortex generator, rectangle vortex generator, trapezoidal vortex generator contrasts and analyzes.External also have the scholar that some calculating and experimental research have been carried out in the influence of vortex, vortex stream field and the heat transfer of vortex generator generation.Simultaneously, the part scholar is also arranged, carried out relatively detailed research through the variation of experiment to " whirlpool " in the vortex generator change flow field.
At present, the research of both at home and abroad vortex generator being used in hydrodynamics also compares less, and relevant document and patent have following two: 1, the little people of Liu of Xi'an Communications University etc. have proposed this a kind of thought 2007; 2, Pan of Electronic University Of Science & Technology Of Hangzhou Hua Chen, Chen Ying, Nie Xin etc. have announced two patent of invention respectively in April, 08 and July: novel draft-tube and making method, two patents of a kind of novel draft-tube; But related vortex generator is triangular vane in these two patents, and each parameter of blade all depends on the diameter of turbine draft tube.
Yet vortex generator can produce a series of little whirlpools as the whirlpool generation device, with in the whirlpool of turbine draft tube self.The characteristic in these little whirlpools depends on shape, size and the mounting type of vortex generator, and, can only the neutralize big whirlpool of certain wavelength, the little whirlpool of confirming wavelength.Based on this, need relate to a kind of turbine draft tube energy restitution coefficient and vortex generator that improves its internal stability of improving.
Summary of the invention
Goal of the invention: in order to overcome the deficiency that exists in the existing technology, the present invention provides a kind of improved turbine draft tube energy restitution coefficient simple in structure, with low cost, easy for installation and improves the vortex generator of its internal stability.
Technological scheme: for realizing above-mentioned purpose; A kind of turbine draft tube vortex generator of the present invention; Comprise turbine draft tube and some the logarithm of metal blade is 1 ~ 20 pair to being evenly arranged in the metal blade of turbine draft tube inwall, each metal blade be shaped as right-angled trapezium.
Wherein, Described metal blade thickness is 1mm ~ 2mm; The trapezoidal height of metal blade is 1/50～1/40 of the turbine draft tube current master whirlpool long λ in whirlpool, long 1/20～1/15 of the draft tube water inlet diameter d that is of going to the bottom of right-angled trapezium, and the upper base of right-angled trapezium is long long by 1/4～1/3 for going to the bottom; The angle of trapezoidal height and trapezoidal hypotenuse elongation line is α, satisfied 8 °≤α≤20 °; The angle on plane, two trapezoid blades place is β, satisfied 5 °≤β≤45 °.
As preferably; The metal blade of described right-angled trapezium shape is perpendicular to the draft tube inwall, and the right angle side of right-angled trapezium the limit and linked to each other with draft tube internal face treating selvedge as the limit is installed; Going to the bottom of right-angled trapezium near the water inlet of draft tube; The upper base of right-angled trapezium is away from the water inlet of draft tube, and the height of right-angled trapezium and the intersection point of upper base are apart from half the less than draft tube water inlet diameter d of the distance L of draft tube water inlet, and two metal blades that are provided with in pairs are symmetrically distributed; Plane, two blades place is about the central axis symmetry, and the angle of each blade plane, place and central axis is β/2.
As preferably, the reynolds number Re of fluid satisfies Re＜4 * 10 in the described turbine draft tube
8The time, the metal blade logarithm of right-angled trapezium shape is N, satisfies N＜3, every pair of blade is evenly distributed in the draft tube inwall, so depend on the water inlet diameter d of draft tube apart from l between the every pair of blade; If the reynolds number Re of fluid in the draft tube: satisfy Re>=4 * 10
8The time, the metal blade of every pair of right-angled trapezium is evenly distributed in the draft tube inwall, and the spacing l between the two installation limit mid points of two metal blades that are provided with in pairs satisfies d/10≤l≤d/2.
Beneficial effect: a kind of turbine draft tube vortex generator of the present invention compared with prior art, has the following advantages:
When (1) flowing through trapezoid blade, can produce a series of little whirlpools, and in the actual turbine draft tube of engineering, the reynolds number Re of current generally is far longer than 4 * 10 near the turbine draft tube tube wall owing to current
8So the thickness of viscous sublayer is also bigger.These microvovtexs not only can suppress tangential velocity; Also stop the generation of Maelstrom, reduced the thickness in boundary layer, promoted turbine draft tube interior flow field homogenization; And then reduced the pressure pulsation of turbine draft tube, improved the stability of turbine draft tube operation; Simultaneously, the energy restitution coefficient of turbine draft tube is had a certain upgrade.Be lower than 4 * 10 at reynolds number Re
8The time, at the draft tube inwall 1 pair or 2 pairs of vortex generators are installed, can reduce the non-permanent backflow of near wall in the turbine draft tube, and then reach the purpose that improves turbine draft tube energy restitution coefficient.
(2) a kind of turbine draft tube vortex generator of the present invention simple in structure, easy for installation, safeguard economical, draw materials extensively, the Hydropower Unit of different heads, different operating modes is all had the turbine draft tube energy restitution coefficient of raising and improves its stable effect.The characteristic in the inner whirlpool of turbine draft tube is all depended in vortex generator blade characteristics parameter and mounting point; With in turbine draft tube interior section trailing vortex; Partial vibration also there is certain neutralization; And the volume of blade is little, in use is difficult for producing the deposition of silt and impurity, so easy to maintenance, with low cost.
(3) the present invention can improve the stability of turbine draft tube work, improves the stability of whole hydroelectric power unit operation, has prolonged the life-span of unit, has reduced the apparatus maintenance number of times, reduced hydroelectric system maintenance cost, practiced thrift cost.Simultaneously, the present invention has improved the utilization ratio of water, and the important engineering practical significance was arranged in today of resource worsening shortages.
Description of drawings
Fig. 1 is the structural representation of vortex generator metal blade.
Fig. 2 is the mounting structure figure of vortex generator in draft tube.
The A-A that Fig. 3 installs in draft tube for vortex generator is to sectional drawing.
The B-B that Fig. 4 installs in draft tube for vortex generator is to sectional drawing.
Embodiment
Below in conjunction with accompanying drawing the present invention is done explanation further.
Like Fig. 1～shown in Figure 4; A kind of turbine draft tube vortex generator of the present invention; Comprise turbine draft tube 3 and some the logarithm of metal blade 1 is 1 ~ 20 pair to being evenly arranged in the metal blade 1 of turbine draft tube 3 inwalls, each metal blade 1 be shaped as right-angled trapezium.A kind of turbine draft tube vortex generator of the present invention is installed on the internal face of turbine draft tube 3, and it is the cross section that the inner volute of turbine draft tube becomes that the cross section is installed.So for the turbine draft tube of arbitrary definite operating mode, should simulate its water flow inside characteristic through computational fluid mechanics (CFD) earlier, find out the cross section that inner whirlpool begins to form.
Among the present invention; Metal blade 1 thickness is 1mm ~ 2mm; The trapezoidal height of metal blade 1 is 1/50～1/40 of the turbine draft tube 3 current master whirlpool long λ in whirlpool, long 1/20～1/15 of the draft tube 3 water inlet diameter d that are of going to the bottom of right-angled trapezium, and the upper base of right-angled trapezium is long long by 1/4～1/3 for going to the bottom; The angle of trapezoidal height and trapezoidal hypotenuse elongation line is α, satisfied 8 °≤α≤20 °; The angle on plane, two trapezoid blades place is β, satisfied 5 °≤β≤45 °.
In the present invention, the reynolds number Re of fluid in the turbine draft tube 3 satisfies Re＜4 * 10
8The time, then the metal blade 1 logarithm N of right-angled trapezium shape satisfies N=1 or 2, and every pair of blade is evenly distributed in the inwall of draft tube 3, so depend on the water inlet diameter d of draft tube 3 apart from l between the every pair of blade; If the reynolds number Re of fluid satisfies Re>=4 * 10 in the draft tube
8The time, the metal blade 1 of every pair of right-angled trapezium is evenly distributed in the inwall of draft tube 3, and the spacing l between the every pair two blade two installation limit mid point satisfies d/10≤l≤d/2.
In the present invention; The metal blade 1 of right-angled trapezium shape is perpendicular to the inwall of draft tube 3; The right angle side of right-angled trapezium the limit and is linked to each other with the internal face treating selvedge of draft tube 3 as the limit is installed, the going to the bottom near the water inlet 2 of turbine draft tube 3 of right-angled trapezium; The upper base of right-angled trapezium is away from the water inlet 2 of draft tube 3, and the height of right-angled trapezium and the intersection point of upper base are apart from half the less than draft tube 3 water inlet diameter d of the distance L of the water inlet 2 of turbine draft tube 3; Two metal blades 1 that are provided with in pairs are symmetrically distributed, and plane, two metal blade 1 places is about the central axis symmetry, and the angle of each metal blade plane, 1 place and central axis is β/2.
The present invention installs a series of little vortex generators at the water inlet place of turbine draft tube 3; When current are flowed through vortex generator; Vortex generator can produce a series of little whirlpool; With the formation that stops draft tube 3 inner Maelstroms or in and Maelstrom, to reduce the possibility that negative pressure appears in draft tube 3 center portions, improved the pressure and the speed of draft tube 3 center portion current.Simultaneously, these little whirlpools can stir flowing of water in the separation zone, make away from the high energy current on border to mix with the near low energy current of wall; Increased the energy of place, boundary layer low energy current; Improve the uniformity of draft tube 3 inner each cross section current, avoided the formation of non-permanent recirculation zone, reduced the vibration of draft tube 3 inside; And then, increased the stability of draft tube 3 water flow inside.So for the draft tube 3 of various different operating modes, the present invention all can reach stability that increases its operation and the purpose that improves its energy restitution coefficient, and then improved the generating efficiency of whole hydraulic turbine generator.This in numerous, low head hydropower station has important theory and practice significance.
Simultaneously, turbine draft tube 3 is Diffusers, and the unstability of current is more obvious at the water inlet place of draft tube 3, has great significance so at its water inlet place vortex generator is installed.The vortex generator that the present invention designed can produce a series of little whirlpools as the whirlpool generation device, with in the whirlpool of turbine draft tube 3 self.The characteristic in these little whirlpools depends on shape, size and the mounting type of vortex generator, and, can only the neutralize big whirlpool of certain wavelength, the little whirlpool of confirming wavelength.Based on this, vortex generator design had certain versatility according to whirlpool characteristic in the turbine draft tube 3.In addition, the upper base of right-angled trapezium blade has certain interception to current, and the trailing vortex that vortex generator is produced is more approaching with the center portion of turbine draft tube 3, and the possibility of the negative pressure region formation in turbine draft tube 3 center portions is reduced greatly.
Simultaneously, the size of trapezoid blade can change according to the characteristic in draft tube 3 inner whirlpools, and the distance between the every pair of trapezoid blade is according to the diameter of turbine draft tube 3 water inlets.The current at draft tube 3 water inlet places are with seasonal variations, and the whirlpool of generation can dwindle thereupon or increase, because eddy current generation blade installation is convenient, easy to maintenance, can select and arrange each blade flexibly.
The above only is a preferred implementation of the present invention; Be noted that for those skilled in the art; Under the prerequisite that does not break away from the principle of the invention, can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (4)
1. turbine draft tube vortex generator; It is characterized in that: comprise turbine draft tube (3) and some being evenly arranged in the metal blade (1) of turbine draft tube (3) inwall; The logarithm of metal blade (1) is 1 ~ 20 pair, each metal blade (1) be shaped as right-angled trapezium.
2. turbine draft tube vortex generator according to claim 1; It is characterized in that: the thickness of described right-angled trapezium metal blade (1) is 1mm ~ 2mm; The height of right-angled trapezium metal blade (1) is 1/50～1/40 of turbine draft tube (3) the current master whirlpool long λ in whirlpool; Long 1/20～1/15 of the draft tube water inlet diameter d that is of going to the bottom of right-angled trapezium; The upper base of right-angled trapezium is long long by 1/4～1/3 for going to the bottom, and the angle of the height of right-angled trapezium and right-angled trapezium hypotenuse elongation line is α, 8 °≤α≤20 °; The angle on the plane, two trapezoid blade places that is provided with in pairs is β, 5 °≤β≤45 °.
3. turbine draft tube vortex generator according to claim 2; It is characterized in that: described right-angled trapezium metal blade (1) is perpendicular to the inwall of draft tube (3); The right angle side of right-angled trapezium is as the limit is installed; The limit is installed to link to each other with the internal face treating selvedge of draft tube (3); Going to the bottom near the water inlet (2) of turbine draft tube (3) of right-angled trapezium, the upper base of right-angled trapezium be away from the water inlet (2) of draft tube (3), and the height of right-angled trapezium and the intersection point of upper base are apart from half the less than the water inlet diameter d of draft tube (3) of the distance L of the water inlet (2) of turbine draft tube (3); Two metal blades (1) that are provided with in pairs are symmetrically distributed, and plane, two metal blades (1) place is about the central axis symmetry, and the angle of each metal blade (1) plane, place and central axis is β/2.
4. turbine draft tube vortex generator according to claim 3 is characterized in that: the reynolds number Re of fluid satisfies Re＜4 * 10 in the described turbine draft tube (3)
8The time, the metal blade of right-angled trapezium shape (1) logarithm is N, satisfies N＜3, every pair of blade is evenly distributed in the draft tube inwall; If the reynolds number Re of fluid satisfies Re>=4 * 10 in the draft tube
8The time, the metal blade of every pair of right-angled trapezium (1) is evenly distributed in the draft tube inwall, and the spacing l between the two installation limit mid points of two metal blades (1) that are provided with in pairs satisfies d/10≤l≤d/2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210209725.2A CN102720622B (en) | 2012-06-21 | 2012-06-21 | Vortex generator for turbine draft tube |
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| CN201210209725.2A CN102720622B (en) | 2012-06-21 | 2012-06-21 | Vortex generator for turbine draft tube |
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| CN102720622A true CN102720622A (en) | 2012-10-10 |
| CN102720622B CN102720622B (en) | 2015-02-04 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015184954A1 (en) * | 2014-06-03 | 2015-12-10 | 中山市创想模型设计有限公司 | Draft tube for water turbine |
| CN106542046A (en) * | 2016-09-29 | 2017-03-29 | 中国运载火箭技术研究院 | A kind of disturbed flow type turbo-charger set afterbody damping device |
| CN109441691A (en) * | 2018-10-12 | 2019-03-08 | 西北农林科技大学 | A kind of draft tube band cowling panel Francis turbine |
| CN110222389A (en) * | 2019-05-24 | 2019-09-10 | 河海大学 | Reaction type runner global property numerical computation method and system based on virtual thickness |
| CN110886673A (en) * | 2019-11-26 | 2020-03-17 | 清华大学 | Draft tube and method for reducing water pressure pulsation and pressure gradient of water turbine |
| CN114526392A (en) * | 2022-02-10 | 2022-05-24 | 国网福建省电力有限公司电力科学研究院 | Vortex band device is eliminated in mixing of draft tube |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015184954A1 (en) * | 2014-06-03 | 2015-12-10 | 中山市创想模型设计有限公司 | Draft tube for water turbine |
| CN106542046A (en) * | 2016-09-29 | 2017-03-29 | 中国运载火箭技术研究院 | A kind of disturbed flow type turbo-charger set afterbody damping device |
| CN109441691A (en) * | 2018-10-12 | 2019-03-08 | 西北农林科技大学 | A kind of draft tube band cowling panel Francis turbine |
| CN110222389A (en) * | 2019-05-24 | 2019-09-10 | 河海大学 | Reaction type runner global property numerical computation method and system based on virtual thickness |
| CN110222389B (en) * | 2019-05-24 | 2020-08-25 | 河海大学 | Virtual thickness-based counterattack type rotating wheel global characteristic numerical calculation method and system |
| CN110886673A (en) * | 2019-11-26 | 2020-03-17 | 清华大学 | Draft tube and method for reducing water pressure pulsation and pressure gradient of water turbine |
| CN110886673B (en) * | 2019-11-26 | 2021-06-08 | 清华大学 | Draft tube and method for reducing water pressure pulsation and pressure gradient of water turbine |
| CN114526392A (en) * | 2022-02-10 | 2022-05-24 | 国网福建省电力有限公司电力科学研究院 | Vortex band device is eliminated in mixing of draft tube |
| CN114526392B (en) * | 2022-02-10 | 2023-09-22 | 国网福建省电力有限公司电力科学研究院 | Vortex band eliminating device for mixing of draft tube |
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