CN105201728A - Design method of combined wing section blade of horizontal shaft tidal current energy water turbine - Google Patents
Design method of combined wing section blade of horizontal shaft tidal current energy water turbine Download PDFInfo
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- CN105201728A CN105201728A CN201510627809.1A CN201510627809A CN105201728A CN 105201728 A CN105201728 A CN 105201728A CN 201510627809 A CN201510627809 A CN 201510627809A CN 105201728 A CN105201728 A CN 105201728A
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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 discloses a design method of a combined wing section blade of a horizontal shaft tidal current energy water turbine. The method comprises the steps of researching the hydrodynamic performance of a conventional wing section and the hydrodynamic performance of a bionic wing section separately, combining a conventional blade wing section with the bionic wing section according to the function of all blade elements in the blade, and designing out a combined wing section blade which is superior in performance; obtaining a three-dimensional digital model of a fish fin, selecting section contours of different positions of the fish fin as bionic fish-fin wing sections, selecting a bionic fish-fin wing section through analysis software, exporting the bionic fish-fin wing section and required two-dimensional coordinates of the conventional wing section, optimizing blade elements of the designed blade, obtaining parameters of each blade element, making the bionic wing section and the required conventional wing section correspond to the blade elements, converting the three-dimensional coordinates of the wing section into three-dimensional coordinate data, importing the three-dimensional coordinate data into three-dimensional design software, conducting setting-out treatment, and finally generating the combined wing section blade. By means of the design method, the hydrodynamic performance of the combined wing section blade is made to be superior, and the energy-obtaining efficiency of the water turbine is remarkably improved.
Description
Technical field
The present invention relates to a kind of design method of turbine blade, particularly relate to the design method of a kind of horizontal axis tidal current energy water turbine combination airfoil fan.
Background technique
In recent years, the exploitation of ocean energy penetrates into every field, marine tidal-current energy is especially subject to extensive research as a kind of clean renewable energy sources, marine tidal-current energy have reliability, periodically, sustainability, and the advantage of widely distributed grade, it will play an important role in future source of energy, in order to utilize marine tidal-current energy, water turbine is the main acquisition equipment of marine tidal-current energy, therefore the capacitation efficiency how improving tidal current energy water turbine becomes to be affected marine tidal-current energy and to generate electricity the key factor applied, and thus the development of water turbine is more and more paid attention to.
Blade is the core component of water turbine, and aerofoil profile is the basis forming blade, and therefore the selection of vane airfoil profile will directly affect the capacitation efficiency of water turbine.Due to horizontal axis water turbine occur more late, also do not have methodology to be applicable to the design of horizontal axis tidal current energy turbine blade completely at present, but because of its form similar to wind energy conversion system, mostly adopt the design method of more ripe pneumatic equipment blades made both at home and abroad.But there is larger difference in the two working medium, cause the water turbine capacitation efficiency obtained according to vane design of wind turbines method lower in the factors such as density, viscosity, flow velocity.Therefore, how designing a kind of blade meeting working medium characteristic is the key issue of axle tidal current energy water turbine capacitation efficiency of improving the standard.Patent CN104408260A provides a kind of tidal current energy water turbine vane airfoil profile design method, the method is based on genetic Optimization Algorithm, the All aspects of of water turbine hydrofoil profile design are considered, can require to obtain best hydrofoil profile curve according to different waters and ocean environment, there is feasible solution and represent popularity, collective search, random search and the advantage such as of overall importance, can globally optimal solution be obtained.
Bionics being applied to blade design is a new developing direction, and research shows, is applied in the design of Blades For Horizontal Axis Wind by the natural characteristic of birds wing, can significantly improve its capacitation efficiency.Meanwhile, marine fishes are through the natural derivation of For hundreds of millions of years, and its body structure feature and motion mode can adapt to live in water well, have excellent hydrodynamic performance.Research shows, the motion of fin coordinates has vital effect for hydrodynamic performance, therefore fish bionics fiber causes the interest of numerous researcher, and Push Technology field achieves better application under water, this just brings new enlightenment for the design of horizontal axis tidal current energy water turbine bionic blade.But the effect of fin is mainly used for health and advances and balance control, there is larger difference, be thus not suitable for adopting form cutting design and the identical blade of fin shape with the rotary motion of water turbine.
Summary of the invention
For the problems referred to above, the object of this invention is to provide the design method of a kind of horizontal axis tidal current energy water turbine combination airfoil fan, bionical aerofoil profile and conventional aerofoil profile is utilized mutually to be combined to form combined-wing type blade, make the hydrodynamic performance of blade more superior, improve the capacitation efficiency of water turbine, to make up the deficiencies in the prior art.
Horizontal axis tidal current energy turbine blade design method provided by the invention adopts classical WILSON theory and foline momentum theory, study the hydrodynamic performance of conventional aerofoil profile and bionical aerofoil profile respectively, according to the effect of each foline in blade, the vane airfoil profile of routine is combined with bionical aerofoil profile, designs the combined-wing type blade that performance is more superior.
For achieving the above object, the concrete technological scheme that the present invention takes is:
A design method for horizontal axis tidal current energy water turbine combination airfoil fan, is characterized in that, comprise the following steps:
1) spatial digitizer is adopted to obtain the three-dimensional digital model of fin sample, i.e. the cloud data of fin;
2) by reverse engineering software, above-mentioned cloud data is processed, obtain the three-dimensional digital model of fin, choose arbitrarily the cross-sectional profiles at fin diverse location place as Biomimetic Fish Fin aerofoil profile along fin length direction;
3) by aerofoil profile specialty analysis software by compared with the multiple conventional aerofoil profile of the Biomimetic Fish Fin aerofoil profile that is truncated to and water turbine is under different Reynolds number, choose the Biomimetic Fish Fin aerofoil profile that ratio of lift coefficient to drag coefficient when reaching best reynolds' number is maximum, and derive the two-dimensional coordinate of this aerofoil profile and each conventional aerofoil profile, obtain bionical aerofoil profile two-dimensional coordinate and each conventional aerofoil profile two-dimensional coordinate;
4) according to designing requirement, the parameters such as the power of water turbine, blade quantity, nominal flow rate, tip-speed ratio, impeller rated speed and impeller diameter are determined;
5) according to the parameter obtained in step 4), utilize conventional vane design method design blade, determine the length designing blade, its length is divided into
k-1 equal portions, now just obtain
kindividual cross section, i.e. foline, by numerical analysis software to above-mentioned
kindividual foline is optimized respectively, obtains the parameter of each foline;
6) according to the effect of designing requirement and blade diverse location, selecting step 3) in Biomimetic Fish Fin aerofoil profile and different conventional aerofoil profile each foline respectively in corresponding step 5), and be three-dimensional coordinate by each aerofoil profile two-dimensional coordinate of being obtained by step 3) according to the foline Parameter Switch in step 5);
7) aerofoil profile three-dimensional coordinate data obtained above is imported in Three-dimensional Design Software, carry out setting-out process, final generation combined-wing type blade.
Described step 2) in obtain Biomimetic Fish Fin aerofoil profile concrete grammar be: along fin length direction by fin n decile, namely obtain n-1 Biomimetic Fish Fin aerofoil profile, wherein, the size of n by fin length, intend the bionical aerofoil profile quantity decision chosen.
Conventional aerofoil profile described in described step 3) is NACA series aerofoil sections.
The concrete steps of the foline optimization described in described step 5) are: according to designing requirement, utilize conventional vane design method design blade, are divided into along its length by the blade of design
k-1 equal portions, namely obtain
kindividual foline; Each foline is studied separately, and supposes
ithe radius of individual foline is
r i , utilize numerical analysis software to objective function, constraint equation and solving equation coding code respectively; By numerical analysis software with Optimization Toolbox call said procedure code, calculate the parameters such as the radius of each foline, tip-speed ratio, axial factor, the circumferential factor, the tip loss factor, inflow angle, chord length, torsional angle.
Aerofoil profile two-dimensional coordinate in described step 6) is converted to aerofoil profile three-dimensional coordinate data by translation transformation, scale transformation, rotation transformation and the skew conversion along Z axis.
Advantage of the present invention: Leaf design of the present invention have employed Biomimetic Fish Fin aerofoil profile and conventional aerofoil profile is combined, can adapt to the characteristic of working medium better, thus have higher capacitation efficiency; The present invention is different according to different piece in blade capacitation process the role of turbine blade from blade root to blade tip, select different aerofoil profiles and the combined-wing type blade designed, experiment proves that the present invention can significantly improve capacitation efficiency and the reliability of blade; In the sea situation of different in flow rate, the flow direction, all can adopt design method provided by the invention, select different bionical aerofoil profiles and conventional aerofoil profile to carry out composite design airfoil fan, thus obtain higher capacitation efficiency.
Accompanying drawing explanation
Fig. 1 is shark tail fin cross section aerofoil profile exemplary plot in the embodiment of the present invention.
Fig. 2 is the diverse location aerofoil profile figure of shark tail fin in the embodiment of the present invention.
Fig. 3 is several bionical shark tail fin aerofoil profile hydrodynamic performance analysis examples figure in the embodiment of the present invention.
Fig. 4 is the aerofoil profile selection exemplary plot of the combined-wing type blade in the embodiment of the present invention.
Fig. 5 is the combined-wing type blade exemplary plot in the embodiment of the present invention.
Wherein, 1-NACA63-018 aerofoil profile; 2-NACA0015 aerofoil profile; 3-bionical shark tail fin aerofoil profile; 4-NACA2412 aerofoil profile; 5-NACA2410 aerofoil profile.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, further illustrate embodiments of the present invention below in conjunction with accompanying drawing by specific embodiment.
The present embodiment adopts shark tail fin as the acquisition model of bionical aerofoil profile, and the concrete operation method in this embodiment is equally applicable to the acquisition of other fins for bionical aerofoil profile, and the design of combined-wing type blade.
Be bionical object based on shark tail fin, the design method of horizontal axis tidal current energy water turbine combination airfoil fan, comprises the following steps:
1) spatial digitizer is adopted to obtain the three-dimensional digital model of shark tail fin, i.e. the cloud data of shark tail fin;
2) by reverse engineering software, above-mentioned cloud data is processed, obtain the three-dimensional digital model of shark tail fin, as shown in Figure 1;
3) according to the length of shark tail fin, carried out 8 deciles, obtained the cross section profile of 7 positions as bionical shark tail fin aerofoil profile, as shown in Figure 2;
4) by aerofoil profile specialty analysis software by the hydrodynamic performance of 7 tail fin aerofoil profiles that is truncated to respectively with the conventional aerofoil profile of horizontal axis tidal current energy water turbine NACA series under different Reynolds number compared with, the tail fin aerofoil profile that when selecting the best reynolds' number reaching designing requirement, ratio of lift coefficient to drag coefficient is maximum, and derive the two-dimensional coordinate of this aerofoil profile and each conventional aerofoil profile, obtain bionical aerofoil profile two-dimensional coordinate and each conventional aerofoil profile two-dimensional coordinate; As shown in Figure 3, when reynolds' number 80000, when the angle of attack is respectively 10 ° and 6.5 °, the aerofoil profile of bionical shark tail fin 37.5% and 12.5% position has larger ratio of lift coefficient to drag coefficient (Cl/Cd), and when being 8.5 ° with the angle of attack, the maximum lift-drag ratio of NACA63-412 aerofoil profile is close;
5) according to the rated power of designing requirement determination water turbine
p, blade quantity
b, nominal flow rate
v rated, tip-speed ratio
λ, impeller rated speed
n, water turbine capacitation coefficient
c pand impeller diameter
d, the formula of the power of water turbine is:
, wherein,
ρfor density of sea water;
6) according to the parameter obtained in step 5), utilize conventional vane design method design blade, then be optimized foline by numerical analysis software, obtain the parameter of each foline, concrete steps are as follows:
(1) according to designing requirement, utilize conventional vane design method design blade, determine the length of blade, its length is divided into
k-1 equal portions, now just obtain
kindividual cross section, i.e. foline;
(2) each foline is studied separately, if the
ithe radius of individual foline is
r i , utilize numerical analysis software to objective function, constraint equation and solving equation coding code respectively;
(3) by numerical analysis software with Optimization Toolbox call said procedure code, calculate the parameters such as the radius of each foline, tip-speed ratio, axial factor, the circumferential factor, the tip loss factor, inflow angle, chord length, torsional angle;
7) first the optimum tail fin aerofoil profile that obtains in conventional aerofoil profile and step 4) each foline respectively in corresponding step 6) is chosen according to the effect of designing requirement and blade diverse location, and according to the foline parameter in step 6), each aerofoil profile two-dimensional coordinate obtained by step 4) is converted to three-dimensional coordinate data by translation transformation, scale transformation, rotation transformation and the skew conversion along Z axis; The basis for selecting following methods of each several part aerofoil profile in blade:
A, as shown in Figure 4, the aerofoil profile being in blade root position need bear most of moment of torsion during blade rotary, by the com-parison and analysis of the conventional aerofoil profile of NACA series, selects the NACA63-018 aerofoil profile (1) that relative thickness is larger;
B, as shown in Figure 4, be in the aerofoil profile of transition portion in blade root and leaf, the effect that fraction moment of torsion plays blade capacitation again should be born, select relative thickness be 15% NACA0015 aerofoil profile (2);
C, as shown in Figure 4, the key position of capacitation in the middle part of blade, the bionical shark tail fin aerofoil profile (3) that the ratio of lift coefficient to drag coefficient obtained in selection step 4) is maximum, its relative thickness is 13.4% by analysis, relative thickness is all less than the relative thickness of root and transition part, can realize the sawtooth design of blade;
D, as shown in Figure 4, be in the aerofoil profile to blade tip transition portion in leaf, the requirement that capacitation is functional, tip loss is less need be met, select relative thickness be 12% NACA2412 aerofoil profile (4);
E, as shown in Figure 4, be in the aerofoil profile of tip segment, for reducing the impact of blade tip eddy current on blade capacitation as far as possible, select relative thickness be 10% NACA2410 aerofoil profile (5);
8) in Three-dimensional Design Software by three-dimensional coordinate data obtained above, carry out setting-out process and generate combined-wing type blade, as shown in Figure 5.
By 3 combined-wing type blades installations on water turbine, under design condition, adjust propeller pitch angle, test and record the generated output of water turbine under different propeller pitch angle, thus calculating the capacitation efficiency of water turbine; Through measured data analysis, the highest capacitation efficiency of water turbine using combined-wing type blade is 0.368, under equal operating mode, the water turbine capacitation efficiency adopting NACA63-8XX airfoil fan is 0.346, if the transmission efficiencies at different levels of water turbine are counted, then the capacitation efficiency of water turbine is higher, and the capacitation efficiency of combined-wing type is obviously better than conventional aerofoil profile as can be seen here.
Above-mentioned embodiment only illustrates principle and the method for the design, not for limiting the present invention.Any personage understood this new application without prejudice under spirit of the present invention and category, can modify above-described embodiment and changes.Therefore, have in all art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify and change, must be contained by claim of the present invention.
Claims (5)
1. a design method for horizontal axis tidal current energy water turbine combination airfoil fan, is characterized in that, comprise the following steps:
1) spatial digitizer is adopted to obtain the three-dimensional digital model of fin sample, i.e. the cloud data of fin;
2) by reverse engineering software, above-mentioned cloud data is processed, obtain the three-dimensional digital model of fin, choose arbitrarily the cross-sectional profiles at fin diverse location place as Biomimetic Fish Fin aerofoil profile along fin length direction;
3) by aerofoil profile specialty analysis software by compared with the multiple conventional aerofoil profile of the Biomimetic Fish Fin aerofoil profile that is truncated to and water turbine is under different Reynolds number, choose the Biomimetic Fish Fin aerofoil profile that ratio of lift coefficient to drag coefficient when reaching best reynolds' number is maximum, and derive the two-dimensional coordinate of this aerofoil profile and each conventional aerofoil profile, obtain bionical aerofoil profile two-dimensional coordinate and each conventional aerofoil profile two coordinates;
4) according to designing requirement, the parameters such as the power of water turbine, blade quantity, nominal flow rate, tip-speed ratio, impeller rated speed and impeller diameter are determined;
5) according to the parameter obtained in step 4), utilize conventional vane design method design blade, determine the length designing blade, its length is divided into
k-1 equal portions, now just obtain
kindividual cross section, i.e. foline, by numerical analysis software to above-mentioned
kindividual foline is optimized respectively, obtains the parameter of each foline;
6) according to the effect of designing requirement and blade diverse location, selecting step 3) in Biomimetic Fish Fin aerofoil profile and conventional aerofoil profile each foline respectively in corresponding step 5), and be three-dimensional coordinate by each aerofoil profile two-dimensional coordinate of being obtained by step 3) according to the foline Parameter Switch in step 5);
7) aerofoil profile three-dimensional coordinate data obtained above is imported in Three-dimensional Design Software, carry out setting-out process, final generation combined-wing type blade.
2. the design method of water turbine combination airfoil fan as claimed in claim 1, is characterized in that, step 2) in obtain Biomimetic Fish Fin aerofoil profile concrete grammar be: along fin length direction by fin
ndecile, namely obtains
n-1 Biomimetic Fish Fin aerofoil profile, wherein,
nsize determined by the length of fin, the bionical aerofoil profile quantity intending choosing.
3. the design method of water turbine combination airfoil fan as claimed in claim 1, it is characterized in that, the conventional aerofoil profile described in step 3) is NACA series aerofoil sections.
4. the design method of water turbine combination airfoil fan as claimed in claim 1, it is characterized in that, the concrete steps of the foline optimization described in step 5) are: according to designing requirement, utilize conventional vane design method design blade, are divided into along its length by the blade of design
k-1 equal portions, namely obtain
kindividual foline; Each foline is studied separately, and supposes
ithe radius of individual foline is
r i , utilize numerical analysis software to objective function, constraint equation and solving equation coding code respectively; By numerical analysis software with Optimization Toolbox call said procedure code, calculate the parameters such as the radius of each foline, tip-speed ratio, axial factor, the circumferential factor, the tip loss factor, inflow angle, chord length, torsional angle.
5. the design method of water turbine combination airfoil fan as claimed in claim 1, is characterized in that, the aerofoil profile two-dimensional coordinate in step 6) is converted to aerofoil profile three-dimensional coordinate data by translation transformation, scale transformation, rotation transformation and the skew conversion along Z axis.
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| CN105844034A (en) * | 2016-03-30 | 2016-08-10 | 刘雄飞 | Sparrow hawk wing section bionic method for blades of horizontal-axis wind turbines |
| CN106227985A (en) * | 2016-09-09 | 2016-12-14 | 中国海洋大学 | Marine tidal-current energy trunnion axis hydraulic turbine blade airfoil family method for designing |
| CN109185009A (en) * | 2018-09-07 | 2019-01-11 | 杭州江河水电科技有限公司 | A kind of impeller unit of the round-trip bimodal current of passive self-adaptive |
| CN110594072A (en) * | 2019-05-27 | 2019-12-20 | 合肥工业大学 | Bionic wing-shaped blade |
| CN110735759A (en) * | 2019-11-08 | 2020-01-31 | 江苏科技大学 | Bionic tidal current energy power generation device |
| CN111231055A (en) * | 2020-01-07 | 2020-06-05 | 国网四川省电力公司映秀湾水力发电总厂 | Reverse solving method for three-dimensional model of runner blade of mixed-flow water turbine |
| CN111396229A (en) * | 2020-03-18 | 2020-07-10 | 武汉大学 | Nonlinear design method for blade placement angle considering both runner efficiency and abrasion condition |
| CN112001033A (en) * | 2020-09-03 | 2020-11-27 | 哈尔滨工程大学 | Bionic crab airfoil optimization design method based on combined CST algorithm |
| CN112084594A (en) * | 2020-09-07 | 2020-12-15 | 河海大学 | Improved tidal current energy water turbine performance prediction method |
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| CN105844034A (en) * | 2016-03-30 | 2016-08-10 | 刘雄飞 | Sparrow hawk wing section bionic method for blades of horizontal-axis wind turbines |
| CN105844034B (en) * | 2016-03-30 | 2019-07-12 | 中国矿业大学银川学院 | The sparrow hawk aerofoil profile bionic method of horizontal shaft wind-driven generator vane |
| CN106227985A (en) * | 2016-09-09 | 2016-12-14 | 中国海洋大学 | Marine tidal-current energy trunnion axis hydraulic turbine blade airfoil family method for designing |
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| CN110735759A (en) * | 2019-11-08 | 2020-01-31 | 江苏科技大学 | Bionic tidal current energy power generation device |
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| CN111396229A (en) * | 2020-03-18 | 2020-07-10 | 武汉大学 | Nonlinear design method for blade placement angle considering both runner efficiency and abrasion condition |
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| CN112084594A (en) * | 2020-09-07 | 2020-12-15 | 河海大学 | Improved tidal current energy water turbine performance prediction method |
| CN112084594B (en) * | 2020-09-07 | 2023-03-24 | 河海大学 | Improved tidal current energy water turbine performance prediction method |
| RU2757242C1 (en) * | 2020-09-30 | 2021-10-12 | Общество с ограниченной ответственностью «Лизинговая Компания «ЛИАКОН» | Radial-axial hydraulic turbine and method for manufacture thereof |
| CN112632870A (en) * | 2020-12-28 | 2021-04-09 | 中国人民解放军国防科技大学 | Bionic robot fish driving optimization method based on RBF moving grid |
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| CN116729606B (en) * | 2023-08-15 | 2023-11-10 | 中国海洋大学 | Low-disturbance MPF bionic fluctuation propeller |
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