CN113482843A - Bionic wing-shaped vertical shaft water turbine power generation device - Google Patents
Bionic wing-shaped vertical shaft water turbine power generation device Download PDFInfo
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- CN113482843A CN113482843A CN202110894978.7A CN202110894978A CN113482843A CN 113482843 A CN113482843 A CN 113482843A CN 202110894978 A CN202110894978 A CN 202110894978A CN 113482843 A CN113482843 A CN 113482843A
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- 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
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
- F03B13/26—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using tide energy
- F03B13/264—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using tide energy using the horizontal flow of water resulting from tide movement
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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
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Turbines (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
A bionic wing-shaped vertical shaft water turbine power generation device belongs to the technical field of renewable energy sources. The device sets up three rotor in seabed platform's three tip with isosceles triangle array mode, and through the mounting means of difference, the direction of rotation that makes two rotor blades of incident flow is opposite, and two rotors form clockwise and anticlockwise whirlpool respectively, and the direct and inverse vortex pair can form anti-karman vortex street, has reduced the wake influence, improves the hydrodynamic force utilization efficiency of the hydraulic turbine. Rotating vane all adopts the protruding structure of rhomboid of imitative seat head whale fin limb, can slow down the stall interval, can follow and catch more energy in the fluid, improves the capacitation efficiency of the hydraulic turbine, and the reduction resistance can be so that reduce the structural strength of hydraulic turbine, and simultaneously, the wing section blade that adopts imitative seat head whale fin limb can change the torrent structure of wake, makes the vortex become less to reduce the influence of wake noise to the environment. The wing-shaped end plates are additionally arranged at the two ends of the bionic wing-shaped blade, so that the pressure pulsation of the blade can be reduced, and the vortex generated by the blade tip can be offset.
Description
Technical Field
The invention relates to a bionic wing-shaped vertical shaft water turbine power generation device, and belongs to the technical field of renewable energy sources.
Background
The ocean energy is a clean renewable energy source and has the characteristics of large reserve and wide distribution. At present, the development and utilization of ocean energy by human beings are focused on two forms of ocean wind power generation and tidal current energy generation. Wherein, tidal current energy power generation technology is mature and has wide application. Compared with other renewable energy sources, tidal current energy has the following characteristics: 1) strong regularity and predictability; 2) the power density is high, and the energy is stable; 3) the utilization form is open, and the influence on the marine environment is small.
In the actual arrangement of the tidal current energy water turbine power generation device, when the cloth machine is dense, the downstream water turbine is influenced by the wake flow of the upstream water turbine, so that the utilization efficiency of the water turbine is reduced, land resources cannot be fully utilized when the distance between the cloth machine is large, the utilization rate of the whole water turbine is not high, and the service life cycle is short. Experiments and numerical simulation researches find that when the two vertical axis water turbine rotors adopt different rotating directions, clockwise vortexes and anticlockwise vortexes are formed respectively, the clockwise vortexes and the anticlockwise vortexes form anti-Karman vortex streets, gain effects are achieved on the following flow fields, and wake flow influences are reduced. When the rotor is applied to a vertical shaft water turbine generator, each direct vortex pair is regarded as two vertical shaft water turbine rotors with different rotation directions. As shown, each vertex of the triangle is considered to be the location of each turbine in the array.
With the continuous development and utilization of tidal current energy, scientific environmental assessment is required before project construction, including assessment of the influence of noise of a tidal current energy water turbine on marine organisms in the construction period and the operation period, and the rotor blades of the water turbine adopt bionic wing shapes, so that the pressure pulsation on the surfaces of the wing shapes is reduced, and the influence of the noise on the marine environment is reduced.
Disclosure of Invention
The purpose of the invention is as follows: in order to improve the energy obtaining efficiency of the conventional vertical axis water turbine power generation device, enhance the stability of a water turbine system, improve the arrangement efficiency of a water turbine array, reduce the influence of wake flow and further reduce the influence of environmental noise caused by the water turbine, the invention provides the bionic wing type vertical axis water turbine power generation device. The bionic wing-shaped vertical shaft water turbine power generation device adopts the bionic wing-shaped blades of the fin-shaped limb wing sections of the bionic whale, the amplitude a of the protrusions on the bionic wing-shaped blades is 5-12% of the chord length of the wing-shaped blades, the protrusion angle alpha is 40 degrees, the protrusion length b is 10% of the blade extension length d, the stall interval of the blades can be slowed down, the lift force is increased, and the resistance is reduced; the turbulence structure of the wake flow is changed, so that the vortex becomes smaller, and the wake noise is reduced. When water flows through the first two rotors, the clockwise vortex pair and the anticlockwise vortex pair form an anti-Karman vortex street due to different rotation directions of the rotors, and a gain effect is achieved on a rear flow field. The outer half ends of the top and the bottom of the bionic wing-shaped blade are additionally provided with wing-shaped end plates, so that the pressure pulsation of the blade can be reduced, the vortex generated by the blade tip can be counteracted, and the length c of each wing-shaped end plate is 1.2 times of the chord length e of the blade; the airfoil-shaped end plate only acts in the azimuth angle range of the positive torque provided by the blade, and fails at other positions of the circumference, so that the self resistance of the end plate is reduced, the power output of the water turbine is further enhanced, and the variation amplitude of the torque is reduced.
The technical scheme adopted by the invention is as follows: the utility model provides a bionical wing section vertical axis hydraulic turbine power generation facility, includes vertical axis hydraulic turbine generating set, seabed base and spud leg, and seabed base is connected with the spud leg of fixing on the seabed, vertical axis hydraulic turbine generating set adopts three vertical axis hydraulic turbine to be the structure that triangle-shaped was arranged, and vertical axis hydraulic turbine contains cabin and vertical axis hydraulic turbine, sets up the generator in the cabin, the speed increaser, the output shaft of speed increaser is connected to the generator, the vertical axis hydraulic turbine contains bionical wing section blade, pivot, link, top cap, and bionical wing section blade passes through link and pivot fixed connection, and the pivot top is supported through the bearing of fixing in the top cap, and the pivot bottom is connected with the input shaft of speed increaser. The vertical shaft water turbine is connected with an input shaft of the speed increaser, so that the generator is driven to rotate.
The three vertical shaft hydraulic turbine units are independently arranged on the seabed base. The top covers at the upper parts of the three vertical shaft water turbines are connected through an upper support rod, and the engine rooms at the lower parts are connected through a lower support rod;
the power generation system is suitable for offshore sea areas, and the pile legs enable the seabed base to be arranged at the seabed in a piling mode.
The airfoil-shaped end plates are only arranged on the outer end faces of the top and the bottom of the bionic airfoil-shaped blade.
The bionic airfoil blade adopts an imitated whale fin limb structure provided with a plurality of semi-diamond protrusions, the amplitude a of the semi-diamond protrusions of the bionic airfoil blade is 5-12% of the chord length e of the bionic airfoil blade, the angle alpha is 40 degrees, and the length b is 10% of the extension length d of the bionic airfoil blade;
the bionic wing-shaped blade is characterized in that the top and the bottom of the bionic wing-shaped blade are provided with front ends which are aligned with the top center line and the bottom center line of the bionic wing-shaped blade, the rear ends of the bionic wing-shaped blade extend out of a streamlined wing-shaped end plate on the outer side of the bionic wing-shaped blade, and the length c of the wing-shaped end plate is 1.2 times of the chord length e of the bionic wing-shaped blade.
The three vertical axis hydraulic turbine units are arranged in an isosceles triangle shape, the rotating directions of the two incident flow vertical axis hydraulic turbines are opposite, the rotating shaft of each vertical axis hydraulic turbine is connected with the bionic wing-shaped blades which are uniformly distributed in the circumferential direction, and the distance L between every two adjacent rotating shafts is four times of the radius R of the rotor.
By adopting the technical scheme, the three rotating shafts are independently installed, the two incident flow vertical shaft water turbines rotate relatively, the bionic wing blades of each vertical shaft water turbine are arranged at equal intervals along the rotating surface of the water turbine, and the blades are connected to the rotating shafts of the water turbines through the connecting frames. When water flows through the tidal current energy water turbine power generation device, the water turbine rotors rotate around respective rotating shafts under the action of lift force, and the two vertical shaft rotors form an anti-Karman vortex street along an anti-reverse vortex pair due to different rotating directions of the two vertical shaft rotors, so that a gain effect is realized on a rear flow field; the three rotors are arranged into an isosceles triangle, and the distance L between every two rotating shafts is four times of the radius R of the rotors, so that the utilization efficiency of the whole water turbine on energy is improved, the system stability is enhanced, and the power generation device can quickly reach a stable output state.
The invention has the beneficial effects that: a bionic wing type vertical shaft water turbine power generation device comprises a vertical shaft water turbine power generation unit, a seabed base and pile legs, wherein the seabed base is connected with the pile legs fixed on a seabed, and the vertical shaft water turbine power generation unit is of a structure that three vertical shaft water turbine units are arranged in a triangular mode. According to the bionic wing-shaped vertical axis water turbine power generation device, the three rotors are arranged at the three ends of the seabed platform in an isosceles triangular array mode, the rotating directions of the two rotor blades of the incident flow are opposite through different installation modes, the gain effect is realized on the subsequent flow field, the wake flow influence is reduced, and the hydrodynamic force utilization efficiency of the water turbine is improved; rotating vane all adopts the protruding structure of the semi-rhombus of imitative prowl fin limb, can slow down the stall interval, can follow and catch more energy in the fluid, improves the capacitation efficiency of the hydraulic turbine, and the reduction resistance can be so that reduce the structural strength of hydraulic turbine, and simultaneously, the wing section blade of adopting imitative prowl fin limb can change the torrent structure of wake, makes the vortex become less to reduce the wake noise, reduce the influence of noise to the environment. The airfoil end plates are additionally arranged at the outer end parts of the two ends of the bionic airfoil blade, so that pressure pulsation of the blade can be reduced, eddy currents generated by blade tips can be offset, the airfoil end plates only act in the azimuth angle range of the forward torque provided by the blade, the airfoil end plates fail at other positions of the circumference, the resistance of the end plates is reduced, the power output of the water turbine is further enhanced, and the change amplitude of the torque is reduced. Three rotors of the device are arranged in a triangle, so that the influence of bending moment caused by a single-rotor structure is reduced, and the stability of the structure is improved.
Description of the drawings:
fig. 1 is a three-dimensional structure diagram of a bionic wing type vertical axis water turbine power generation device.
Fig. 2 is a front view of a bionic wing type vertical axis water turbine power generation device.
Fig. 3 is a left side view of a bionic wing type vertical axis water turbine power generation device.
Fig. 4 is a top view of a bionic wing type vertical axis water turbine power generation device.
Fig. 5 is a partially enlarged view of a in fig. 3.
Fig. 6 is a partially enlarged view of B in fig. 4.
Fig. 7 is a partial enlarged view of C in fig. 2.
FIG. 8 is a torque comparison diagram of a bionic wing profile and a common wing profile under different tip speed ratios.
In the figure: 1. the device comprises a vertical shaft water turbine, 2, bionic wing blades, 2a, wing end plates, 2b, semi-diamond-shaped protrusions, 3, connecting frames, 4, a rotating shaft, 5, a top cover, 6, upper supporting rods, 7, a cabin, 7a, lower supporting rods, 8, a seabed base, 9 and pile legs.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings.
The invention is further described below with reference to the accompanying drawings.
Fig. 1-4 show a structure diagram of a bionic wing type vertical axis water turbine power generation device. In the figure, the bionic wing type vertical shaft water turbine power generation device comprises a vertical shaft water turbine generator set, a seabed base 8 and spud legs 9, wherein the seabed base 8 is connected with the spud legs 9 fixed on a seabed, the vertical shaft water turbine generator set adopts a structure that three vertical shaft water turbine sets are arranged in an isosceles triangle, each vertical shaft water turbine set comprises a vertical shaft water turbine 1 and a cabin 7, the cabin 7 is arranged on the seabed base 8, an engine and a speed increaser are arranged in the cabin 7, the generator is connected with an output shaft of the speed increaser, the vertical shaft water turbine 1 comprises bionic wing type blades 2, a connecting frame 3, a rotating shaft 4 and a top cover 5, the upper parts and the lower parts of the bionic wing type blades 2 are respectively connected with the rotating shaft 4 through the connecting frame 3, the upper end of the rotating shaft 4 is fixed through a bearing on the top cover 5, the lower end is connected with an input shaft of the speed increaser in the cabin 7, the top covers 5 on the upper parts of the three vertical shaft water turbines 2 are connected through upper supporting rods 6, the lower nacelle 7 is connected by a lower support bar 7 a.
Three vertical axis hydraulic turbine group is isosceles triangle and arranges, and two meet the opposite direction of rotation settings of flowing vertical axis hydraulic turbine 2, the bionical airfoil blade 2 of three circumference equipartition is connected to pivot 4 of every vertical axis hydraulic turbine 2, and distance L between the adjacent pivot 4 is quadruple's rotor radius R.
The bionic wing type blade in the embodiment adopts an imitated whale fin limb structure provided with a plurality of semi-rhombic protrusions 2b, the amplitude a of the semi-rhombic protrusions 2b of the bionic wing type blade 2 is 5-12% of the chord length e of the bionic wing type blade 2, the angle alpha is 40 degrees, the length b is 10% of the extension length d of the bionic wing type blade 2, and therefore the stall interval can be slowed down when the water turbine rotates, and the utilization efficiency of energy is improved. The bionic wing blade can change the turbulence structure of wake flow, so that the vortex becomes smaller, thereby reducing wake noise and being beneficial to protecting marine environment.
Install wing end plate 2a additional respectively in bionical airfoil blade 2's top and bottom, wing end plate 2 a's length c is 1.2 times of blade chord length e, and wing end plate 2a adopts the streamlined board, and wing end plate 2 a's front end aligns with blade top (bottom) central line of bionical airfoil blade 2, and the rear end stretches out bionical airfoil blade 2's the outside. Carry out the same scale reduction with bionical wing section blade and ordinary wing section blade and handle, adopt chord length e =80mm, span length d =30cm, rotor radius R =15 cm's model carries out hydrodynamic analysis and calculation, set up to the incoming flow 1m/s, compare the moment of bionical wing section and ordinary wing section, figure 8 is the moment contrast picture of bionical wing section and ordinary wing section under different tip speed ratios, can see out, bionical wing section can obtain bigger moment than ordinary wing section under the same yardstick, bionical wing section can be better delay the stall interval, the moment obtains the improvement that is showing under the optimum tip speed ratio operating mode of the hydraulic turbine, thereby improve the capacitation efficiency of hydraulic turbine rotor.
The water flow impacts the blades to drive the water turbine to rotate, and further mechanical energy is converted into electric energy. The three hydraulic turbines are arranged at three ends of the seabed base in an isosceles triangle array mode, and the overall stability is better.
Three groups of water turbines are arranged at three end points of a seabed base in an isosceles triangular array mode, the rotation directions of two incident flow rotor blades of the three groups of water turbines are opposite through different installation modes, the effect of gaining is achieved on a rear flow field, wake flow influence is reduced, and the energy utilization efficiency of the water turbines is improved. According to the actual water flow speed, the distance L between the two rotors is adjusted to be four times of the radius R of the rotors so as to achieve better effect.
The seabed base sets up to isosceles triangle, can improve the stability of structure greatly, reduces because the moment of flexure influence that the single rotor structure brought, is favorable to improving whole utilization efficiency to the energy.
The foregoing detailed description of the preferred embodiments of the invention has been presented. The technical solutions available to a person skilled in the art through logical analysis, reasoning or limited experimentation on the basis of the prior art, according to the concepts of the present invention, are intended to be within the scope of protection defined by the claims.
Claims (2)
1. A bionic wing type vertical shaft water turbine power generation device comprises a vertical shaft water turbine generator set, a seabed base (8) and spud legs (9), wherein the seabed base (8) is connected with the spud legs (9) fixed on the seabed, the bionic wing type vertical shaft water turbine generator set is characterized in that the vertical shaft water turbine generator set adopts a structure that three vertical shaft water turbine sets are arranged in a triangular mode, the vertical shaft water turbine set comprises a vertical shaft water turbine (1) and a cabin (7), the cabin (7) is arranged on the seabed base (8), an engine and a speed increaser are arranged in the cabin (7), the generator is connected with an output shaft of the speed increaser, the vertical shaft water turbine (1) comprises bionic wing type blades (2), a connecting frame (3), a rotating shaft (4) and a top cover (5), the upper portion and the lower portion of the bionic wing type blades (2) are respectively connected with the rotating shaft (4) through the connecting frame (3), and the upper end of the rotating shaft (4) is fixed through a bearing on the top cover (5), the lower end of the top cover is connected with an input shaft of a speed increaser in a cabin (7), the top covers (5) at the upper parts of the three vertical shaft water turbines (2) are connected through an upper support rod (6), and the cabins (7) at the lower parts are connected through a lower support rod (7 a);
the bionic wing-shaped blade (2) adopts an imitated whale fin limb structure provided with a plurality of semi-rhombic bulges (2 b), the width a of the semi-rhombic bulges (2 b) of the bionic wing-shaped blade (2) is 5-12% of the chord length e of the bionic wing-shaped blade (2), the angle alpha is 40 degrees, and the length b is 10% of the extension length d of the bionic wing-shaped blade (2);
the top and the bottom of the bionic wing blade (2) are provided with front ends aligned with the top center line and the bottom center line of the bionic wing blade (2), the rear ends extend out of a streamline wing end plate (2 a) on the outer side of the bionic wing blade (2), and the length c of the wing end plate (2 a) is 1.2 times of the chord length e of the bionic wing blade (2).
2. The bionic wing type vertical axis water turbine power generation device of claim 1, characterized in that: three vertical axis hydraulic turbine group is isosceles triangle and arranges, and the rotation direction of two vertical axis hydraulic turbine (1) that flow to is opposite sets up, and bionic wing section blade (2) of three circumference equipartition are connected in pivot (4) of every vertical axis hydraulic turbine (1), and distance L between adjacent pivot (4) is quadruple's rotor radius R.
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| CN202110894978.7A CN113482843B (en) | 2021-08-05 | 2021-08-05 | Bionic wing-shaped vertical shaft water turbine power generation device |
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| CN202110894978.7A CN113482843B (en) | 2021-08-05 | 2021-08-05 | Bionic wing-shaped vertical shaft water turbine power generation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115081138A (en) * | 2022-06-22 | 2022-09-20 | 武汉大学 | Guide vane design method for improving operation stability of pump turbine and pump turbine |
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