CN108412668B - Double-duct water turbine power generation system - Google Patents
Double-duct water turbine power generation system Download PDFInfo
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- CN108412668B CN108412668B CN201810146270.1A CN201810146270A CN108412668B CN 108412668 B CN108412668 B CN 108412668B CN 201810146270 A CN201810146270 A CN 201810146270A CN 108412668 B CN108412668 B CN 108412668B
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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
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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
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/12—Blades; Blade-carrying rotors
- F03B3/121—Blades, their form or construction
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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
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/12—Blades; Blade-carrying rotors
- F03B3/126—Rotors for essentially axial flow, e.g. for propeller turbines
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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
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/16—Stators
- F03B3/18—Stator blades; Guide conduits or vanes, e.g. adjustable
- F03B3/186—Spiral or volute casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2220/00—Application
- F05B2220/70—Application in combination with
- F05B2220/706—Application in combination with an electrical 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
Abstract
The invention discloses a double-duct water turbine power generation system which comprises an inner duct, wherein a water turbine power generation unit is arranged in the inner duct, an outer duct is sleeved on the outer side of the inner duct, and a shared diffuser is arranged on the water outlet sides of the inner duct and the outer duct. The invention firstly creates a double-duct system consisting of an inner duct and an outer duct, wherein the outer duct plays a role in accelerating water flow, the accelerated water flow is discharged into a diffuser, a plurality of high-speed jet flows are formed in the diffuser, the high-speed jet flows reduce the pressure in the diffuser, the high-speed jet flows play a role in accelerating the water flow of the inner duct, and the efficiency of the whole power generation system is improved; meanwhile, the invention comprises the variable flap type water turbine and the double-stage water turbine power generation system, can improve the self-starting system energy of the water turbine at low flow rate, and improves the water energy utilization rate. The invention has the advantages of high water energy utilization rate, simple structure, long service life, wide applicable water area and high flexibility.
Description
Technical Field
The invention relates to structural improvement of a dam-free water turbine power generation system, in particular to a double-duct water turbine power generation system.
Background
The exhaustion of global fossil fuel reserves and the growing environmental problems have forced people to focus on developing renewable alternative energy sources suitable for ecological environments. The cleanness and the reproducibility of water energy and the maturity of large-scale application technology thereof enable the hydroelectric power generation to become a clean power generation mode with the most mature technology, the most development conditions and the most development prospect. At present, the traditional hydropower development mode in China mainly comprises damming and water storage, potential energy of water is increased, and the rotating speed of a water turbine is improved. However, the hydropower development mode has certain damage to the environment, needs immigration and has large early investment. Therefore, the dam-free water turbine power generation technology has wide application prospect because of no need of damming and water storage, little influence on environment, no need of migration of people and little investment.
Chinese patent application No. CN201710395877.9 discloses a floating pipe type hydroelectric power generation system, which does not need to be dammed, but has some problems: the speed increasing effect of the diversion speed increasing shell is realized by gradually reducing the sectional area of the shell and a diffuser in the prior art, the speed increasing effect on water flow is not obvious, and the water energy utilization rate is not high; the floating pipe is fixed, and only the water flow on the upper layer of the river can be utilized; the capacity of a single machine can be improved only by improving the section area of an inlet and the length of the blades of the water turbine, the quality of the whole system is obviously improved by the scheme, a larger floating pipe is needed to support the whole system, the complexity of production and deployment is improved, and meanwhile, the longer blades of the water turbine enable the water turbine to have larger rotational inertia and to be difficult to start. Chinese patent application No. CN 201511014030.9 discloses a resistance type water turbine and a hydroelectric power generation system, which do not need to be dammed, have good self-starting performance and high stability, but have low efficiency.
In addition, the series of the horizontal-axis tidal current energy water turbines with the spiral blades with the publication numbers of CN105697224B, CN105736213B, CN105736227B, CN105736230B and CN105736231B have the advantages of easiness in maintenance, high reliability, good protection on aquatic organisms and the like, but because the structure is too simple, a water flow accelerating device is not arranged, the single-machine capacity of the water turbine is difficult to improve, and the starting is more difficult along with the capacity improvement.
In general, the turbine power generation system, which is applied to both the dam-less power generation of rivers and the tidal current power generation of oceans, has problems of difficulty in self-starting or low power generation efficiency, thus limiting its application.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the invention provides a double-duct water turbine power generation system which has the advantages of high water energy utilization rate, simple structure, long service life, wide applicable water area and high flexibility.
In order to solve the technical problems, the invention adopts the technical scheme that:
the invention provides a double-duct water turbine power generation system which comprises an inner duct, wherein a water turbine power generation unit is arranged in the inner duct, an outer duct is sleeved outside the inner duct, and a shared diffuser is arranged at the water outlet sides of the inner duct and the outer duct; the water turbine power generation unit comprises a water turbine and a generator which are connected with each other, wherein a front centrifugal self-cleaning pump blade is arranged on the front side of the water turbine, and a rear centrifugal self-cleaning pump blade is arranged on the rear side of the water turbine; the diffuser is of a multi-section annular structure or a spiral structure formed by guide plates, a nozzle is formed by a gap between adjacent guide plates, and the diffuser is communicated with the rear side of the inner duct through the nozzle; the nozzles are arranged in a stepped manner in the flow direction, and the size of the nozzles surrounding in the circumferential direction gradually increases in the flow direction.
Preferably, the hydraulic turbine includes one-level hydraulic turbine and second grade hydraulic turbine, the generator includes one-level generator and second grade generator, be connected with the one-level main shaft between one-level hydraulic turbine, the one-level generator, be connected with the second grade main shaft between second grade hydraulic turbine, the second grade generator, the rotation opposite direction of one-level hydraulic turbine and second grade hydraulic turbine, the front side that the one-level hydraulic turbine was located to preceding centrifugal self-cleaning pump leaf, the rear side that the second grade hydraulic turbine was located to the centrifugal self-cleaning pump leaf in back.
Preferably, the inner duct is a venturi tube-shaped channel formed by a front inner air guide sleeve and a front outer air guide sleeve of the inner duct which are coaxially arranged, the outer duct is a venturi tube contraction segment-shaped channel formed by a front outer air guide sleeve and a front outer air guide sleeve of the inner duct which are coaxially arranged, a protective net and a front rib plate are sequentially arranged on the water inlet side of the water turbine power generation unit in the inner duct, a rear inner air guide sleeve and a rear rib plate are sequentially arranged on the water outlet side of the water turbine power generation unit in the inner duct, the diffuser is arranged around the outer sides of the rear inner air guide sleeve and the rear rib plate in the inner duct, the diffuser is arranged at the tail of the front outer air guide sleeve in the inner duct, the water outlet side of the outer duct is communicated with the water outlet side of the inner duct through the diffuser, the diffuser is provided with an annular nozzle, and the nozzle water outlet is used as a water outlet of the outer duct.
Preferably, the first-stage generator is arranged inside the inner air guide sleeve before the inner duct, the second-stage generator is arranged inside the inner air guide sleeve behind the inner duct, and heat dissipation grooves arranged along the water flow direction are formed in the outer walls of the inner air guide sleeve and the inner air guide sleeve behind the inner duct.
Preferably, the first-stage water turbine is a variable flap type water turbine, the variable flap type water turbine comprises a hub, a plurality of blades are arranged on the hub, the blades consist of a fixed main wing and a flap which can rotate relative to the main wing, and a control assembly for driving the flap to rotate is arranged in the hub.
Preferably, the curve equation of the section outer chord line of the blade of the first-stage water turbine is shown as the formula (1), and the curve equation of the section inner chord line is shown as the formula (2); the curve equation of the section outer chord line of the blade of the secondary water turbine is shown as the formula (3), and the curve equation of the section inner chord line is shown as the formula (4);
yo1= -0.0001x 3- 0.0039x 2- 1.3492x+5.7122 （1）
in the formula (1), the reaction mixture is,yo1representing the outer chord of the cross-section of the blades of a primary turbineyThe coordinates of the position of the object to be imaged,xrepresenting the outer chord of the cross-section of the blades of a primary turbinexCoordinates;
yi1= -0.0001x 3- 0.0143x 2- 1.4592x+0.0629 （2）
in the formula (2), the reaction mixture is,yi1representing chord lines in cross-section of blades of one-stage water turbinesyThe coordinates of the position of the object to be imaged,xrepresenting chord lines in cross-section of blades of one-stage water turbinesxCoordinates;
yo2= -0.0001x 3 +0.0019x 2 +1.3037x -4.1178 （3）
in the formula (3), the reaction mixture is,yo2representing the outer chord of the cross-section of the blades of a two-stage water turbineyThe coordinates of the position of the object to be imaged,xrepresenting the outer chord of the cross-section of the blades of a two-stage water turbinexCoordinates;
yi2= -0.0001x 3 +0.0029x 2 +1.1619x -0.2491 （4）
in the formula (4), the reaction mixture is,yi2representing chord lines in cross-section of blades of secondary turbinesyThe coordinates of the position of the object to be imaged,xcross section showing blades of two-stage hydraulic turbineOf inner stringxAnd (4) coordinates.
Preferably, the flap is movably connected with the main wing through a rotating shaft, an eccentric wheel assembly is arranged at the root of the flap, the control assembly comprises a rotating control rod arranged in the wheel hub, and an eccentric wheel driving assembly used for driving the eccentric wheel assembly to rotate is arranged at the end part of the rotating control rod.
Preferably, the eccentric wheel assembly comprises a rotating disc and a poking rod arranged on one side of the rotating disc in an eccentric mode, the eccentric wheel driving assembly comprises at least one polygonal column, the number of the side faces of the polygonal column is the same as that of blades on the hub, and each side face of the polygonal column is in contact with the side wall of one poking rod.
The double-duct water turbine power generation system has the following beneficial effects: the invention comprises an inner duct, a water turbine power generation unit is arranged in the inner duct, an outer duct is sleeved outside the inner duct, and a shared diffuser is arranged at the water outlet sides of the inner duct and the outer duct; meanwhile, the invention comprises the variable flap type water turbine, which can improve the self-starting system energy of the water turbine at low flow speed; the invention comprises a double-stage water turbine power generation system, and can improve the water energy utilization rate. Therefore, the invention has the advantages of high water energy utilization rate, simple structure, long service life, wide applicable water area and high flexibility.
Drawings
Fig. 1 is a schematic perspective view of an embodiment of the present invention.
FIG. 2 is a schematic side view of the embodiment of the present invention.
FIG. 3 is a schematic sectional view A-A of FIG. 2.
Figure 4 is a three-dimensional exploded structure diagram of the inner duct part component of the embodiment of the invention
FIG. 5 is a three-dimensional exploded view of the bypass portion and the diffuser according to the embodiment of the present invention
Fig. 6 is a schematic perspective view of a water turbine according to an embodiment of the present invention.
Fig. 7 is a schematic side view of a water turbine according to an embodiment of the present invention.
Fig. 8 is a partial schematic structural view of the eccentric wheel driving assembly according to the embodiment of the present invention.
FIG. 9 is a schematic view of a partial structure of an eccentric wheel assembly according to an embodiment of the present invention.
Fig. 10 is a schematic sectional view showing a blade of a one-stage hydraulic turbine in an activated state according to an embodiment of the present invention.
Fig. 11 is a schematic sectional view of a blade of a first-stage hydraulic turbine in a steady state according to an embodiment of the present invention.
Fig. 12 is a schematic sectional structure view of a blade of a secondary turbine in an embodiment of the present invention.
Illustration of the drawings: 1. an inner duct; 101. the front inner air guide sleeve of the inner duct; 102. the front outer air guide sleeve of the inner duct; 11. a protective net; 12. a front rib plate; 13. the inner duct is provided with an inner air guide sleeve; 14. a rear rib plate; 2. an outer duct; 201. an outer flow guide cover of the outer duct; 3. a water turbine power generation unit; 31. a water turbine; 311. a first-stage water turbine; 312. a secondary water turbine; 313. a primary spindle; 32. a generator; 321. a primary generator; 322. a secondary generator; 323. a secondary main shaft; 33. front centrifugal self-cleaning pump blades; 34. a rear centrifugal self-cleaning pump blade; 4. a diffuser; 51. a hub; 52. a blade; 521. a main wing; 522. a flap; 523. a rotating shaft; 524. an eccentric wheel assembly; 5241. rotating the disc; 5242. a poke rod; 53. a control component; 531. rotating the control lever; 532. an eccentric drive assembly.
Detailed Description
As shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, the present embodiment provides a dual-duct hydraulic turbine power generation system, which includes an inner duct 1, a hydraulic turbine power generation unit 3 is disposed in the inner duct 1, an outer duct 2 is sleeved outside the inner duct 1, and a shared diffuser 4 is disposed on the water outlet side of the inner duct 1 and the outer duct 2. The invention initiates a double-duct system consisting of an inner duct 1 and an outer duct 2, the outer duct 2 plays a role in accelerating water flow, the accelerated water flow is discharged into a diffuser 4, a plurality of high-speed jet flows are formed in the diffuser 4, the high-speed jet flows reduce the pressure in the diffuser 4, the water flow in the inner duct 1 plays a role in accelerating, the efficiency of the whole power generation system is improved, and the double-duct system has the advantages of high water energy utilization rate, simple structure, long service life, wide applicable water area and high flexibility.
As shown in fig. 3 and 4, the hydraulic turbine power generation unit 3 includes a hydraulic turbine 31 and a power generator 32 connected to each other, and the hydraulic turbine 31 is provided with a front centrifugal self-cleaning pump blade 33 on the front side and a rear centrifugal self-cleaning pump blade 34 on the rear side. The front centrifugal self-cleaning pump blade 33 and the rear centrifugal self-cleaning pump blade 34 clean the bearing of the generator 32, and the flow velocity of the water flow after doing work is remarkably reduced and flows into the diffuser 4.
As shown in fig. 3 and 4, the water turbine 31 includes a first-stage water turbine 311 and a second-stage water turbine 312, the generator 32 includes a first-stage generator 321 and a second-stage generator 322, a first-stage main shaft 313 is connected between the first-stage water turbine 311 and the first-stage generator 321, a second-stage main shaft 323 is connected between the second-stage water turbine 312 and the second-stage generator 322, the front centrifugal self-cleaning pump vane 33 is arranged on the front side of the first-stage water turbine 311, and the rear centrifugal self-cleaning pump vane 34 is arranged on the rear side of the second-stage water turbine 312. In this embodiment, the rotation directions of the first-stage water turbine 311 and the second-stage water turbine 312 are opposite, so that the water energy utilization rate can be further improved.
As shown in fig. 3 and 4, the endoprosthesis 1 is a venturi-shaped passage formed between a coaxially arranged endoprosthesis front inner fairing 101 and an endoprosthesis front outer fairing 102, the extraductal 2 is a venturi-shaped passage formed between a coaxially arranged endoprosthesis front outer fairing 102 and an extraductal outer fairing 201, a protective net 11 is sequentially arranged in the endoprosthesis 1 at the water inlet side of the turbine power generation unit 3, the front ribbed plate 12, the play water side that is located hydraulic turbine power generation unit 3 in the inner duct 1 is equipped with inner duct back inner kuppe 13, back ribbed plate 14 in proper order, diffuser 4 encircles and arranges in the outside of inner duct back inner kuppe 13 and back ribbed plate 14, diffuser 4 arranges in the tail of outer kuppe 102 before the inner duct, and outer duct 2's play water side passes through diffuser 4 and inner duct 1's play water side intercommunication, diffuser area 4 has annular nozzle, the nozzle delivery port is as outer duct 2's delivery port.
As shown in fig. 3 and 4, the first-stage generator 321 is arranged inside the inner dome 101 before the inner duct, the second-stage generator 322 is arranged inside the inner dome 13 after the inner duct, and heat dissipation grooves arranged along the water flow direction are formed in the outer walls of the inner dome 101 before the inner duct and the inner dome 13 after the inner duct, so that the overall structure is more compact, and the generator can be protected. Moreover, a heat dissipation groove is formed in the outer wall of the inner air guide sleeve 101 in front of the inner duct, so that the contact area between the air guide sleeve and water flow is increased, and heat dissipation is provided for the primary generator 321; the outer wall of the inner air guide sleeve 13 behind the inner duct is carved with a heat dissipation groove, so that the contact area of the air guide sleeve and water flow is increased, and heat dissipation is provided for the secondary generator 322.
The working process of the double-duct water turbine power generation system in the embodiment is as follows:
The outer duct 2 adopts the structural design of a Venturi tube contraction section, the sectional area of an outer channel formed between the outer air guide sleeve 102 and the outer air guide sleeve 201 of the outer duct before the inner duct is continuously reduced, acceleration effect is achieved on water flow, the accelerated water flow is discharged into the diffuser 4, a plurality of high-speed jet flows are formed inside the diffuser 4, the pressure inside the diffuser 4 is reduced through the high-speed jet flows, the acceleration effect is achieved on the water flow of the inner duct 1, and the efficiency of the whole power generation system is improved. The outer duct 2 is equivalent to a jet vacuum pump, the high-speed jet forms suction to the inner duct 1, works on the inner duct 1, and indirectly works on the first-stage water turbine 311 and the second-stage water turbine 312.
As shown in fig. 5, the diffuser 4 in this embodiment is a multi-segment annular structure formed by deflectors, and the gap between adjacent deflectors forms a nozzle, through which the diffuser 4 communicates with the rear side of the inner duct 1, and the jet flow direction (see the arrow in fig. 5) of the nozzle will affect the flow field in the diffuser, so that the accelerated water flow forms a plurality of high-speed jets inside the diffuser 4. It goes without saying that the diffuser 4 may also adopt other structures capable of performing the diffusion function as required, and the diffuser 4 may further adopt a spiral structure formed by a deflector, or the structure and shape of the deflector and/or the nozzle are modified to improve the efficiency of the diffuser 4.
In this embodiment, first-stage hydraulic turbine 311 is a variable flap hydraulic turbine. As shown in fig. 6 and 7, the variable flap turbine includes a hub 51, a plurality of blades 52 are provided on the hub 51, the blades 52 are composed of a fixed main wing 521 and a flap 522 rotatable relative to the main wing 521, and a control assembly 53 for driving the flap 522 to rotate is provided in the hub 51. The control assembly 53 is used for adjusting the rotating position of the flap 522 relative to the main wing 521, so that the included angle A between the flap 522 and the main wing 521 is changed, the hydrodynamic characteristics of the blade 52 are changed, in the starting stage, the included angle A between the flap 522 and the main wing 521 is reduced, the resistance of the blade of the water turbine is increased, the output of the water turbine is higher in torque, the water turbine is easier to start, and at the moment, the efficiency is relatively lower because the water turbine is more inclined to the resistance type water turbine characteristic; after the water turbine is started to reach the rated rotating speed and enters a stable stage, the included angle A between the flap 522 and the main wing 521 is increased, the water turbine is deviated to a lift type water turbine, and the high energy conversion efficiency of the water turbine is kept, so that the starting performance of the water turbine is improved in the starting stage, and the high energy conversion efficiency of the water turbine is kept after the water turbine is started to reach the rated rotating speed.
As shown in fig. 8 and 9, the flap 522 is movably connected to the main wing 521 through a rotating shaft 523, the root of the flap 522 is provided with an eccentric wheel assembly 524, the control assembly 53 includes a rotating control rod 531 arranged in the hub 51, the end of the rotating control rod 531 is provided with an eccentric wheel driving assembly 532 for driving the eccentric wheel assembly 524 to rotate, and the eccentric wheel driving assembly 532 drives the eccentric wheel assembly 524, so as to ensure that the blade 52 has a compact structure and does not affect the fluid dynamics characteristics of the blade 52.
As shown in fig. 8 and 9, the eccentric wheel assembly 524 includes a rotating disc 5241 and a tap lever 5242 eccentrically disposed on one side of the rotating disc 5241, and the eccentric wheel driving assembly 532 includes at least one polygonal column (two in the present embodiment) having the same number of sides as the number of blades 52 on the hub 51 (six in the present embodiment), and each side of the polygonal column is in contact with a side wall of one tap lever 5242. When the polygonal column rotates, the side surface of the polygonal column is in contact with the poke rod 5242 to push the poke rod 5242, so that the rotating disc 5241 rotates, the rotating position of the flap 522 relative to the main wing 521 changes, the included angle a between the flap 522 and the main wing 521 changes, and the purpose of changing the hydrodynamic characteristics of the blade 52 is achieved. The working principle of the variable flap turbine of the embodiment is as follows: (1) in the starting stage, by adjusting the rotating position of the rotating control rod 531, the eccentric wheel driving assembly 532 drives the rotating disc 5241 to rotate through the polygonal column poke rod 5242, and further drives the flap 522 to rotate around the rotating shaft 523, so that the included angle a between the flap 522 and the main wing 521 is reduced, as shown in fig. 10, the resistance of the blades of the water turbine is increased, the water turbine outputs larger torque, the water turbine is easier to start, and at the moment, the efficiency is relatively low because the water turbine is more biased to the resistance type water turbine characteristic; after the water turbine is started to reach a rated rotating speed (a stable stage), the rotating position of the rotating control rod 531 is adjusted, so that the eccentric wheel driving assembly 532 drives the rotating disc 5241 to rotate through the polygonal column poke rod 5242, and further drives the flap 522 to rotate around the rotating shaft 523, so that the included angle a between the flap 522 and the main wing 521 is increased, as shown in fig. 11, the water turbine is deviated to a lift type water turbine, and the energy conversion efficiency is improved.
The sectional line of the blade 52 of the first-stage hydraulic turbine 311 in the steady operation condition is shown in fig. 11, and the point on the sectional line of the blade 52 of the first-stage hydraulic turbine 311 is in the rectangular coordinate systemCoordinate parameters of (a), (b)x,y) See table 1; the blade cross-sectional line shape of the secondary water turbine 312 is shown in fig. 12, and the coordinate parameter of the point on the blade cross-sectional line shape of the secondary water turbine 312 in the rectangular coordinate system (c: (c) (c))x, y) See table 2.
Table 1:
| serial number | x | y | Serial number | x | y |
| 1 | -7.506 | 15.049 | 11 | -82.455 | 56.824 |
| 2 | -15.368 | 25.908 | 12 | -79.281 | 55.291 |
| 3 | -24.222 | 35.909 | 13 | -71.185 | 53.274 |
| 4 | -33.135 | 44.351 | 14 | -62.844 | 50.361 |
| 5 | -40.447 | 50.239 | 15 | -54.08 | 46.55 |
| 6 | -49.05 | 56.017 | 16 | -42.063 | 40.292 |
| 7 | -61.959 | 62.244 | 17 | -30.746 | 33.133 |
| 8 | -70.983 | 64.536 | 18 | -19.218 | 23.5 |
| 9 | -80.758 | 64.653 | 19 | -9.636 | 12.837 |
| 10 | -85.649 | 60.385 | 20 | 0 | 0 |
Table 2:
| serial number | x | y | Serial number | x | y |
| 1 | -6.604 | -11.927 | 12 | -82.455 | 56.824 |
| 2 | -13.124 | -21.105 | 13 | -78.982 | -39.512 |
| 3 | -18.976 | -28.09 | 14 | -71.813 | -43.18 |
| 4 | -26.609 | -36.033 | 15 | -62.625 | -45.505 |
| 5 | -34.546 | -42.641 | 16 | -55.329 | -43.974 |
| 6 | -43.871 | -48.753 | 17 | -48.773 | -41.535 |
| 7 | -54.232 | -52.789 | 18 | -42.611 | -38.53 |
| 8 | -65.968 | -53.807 | 19 | -34.546 | -33.744 |
| 9 | -74.339 | -51.581 | 20 | -25.899 | -27.535 |
| 10 | -81.858 | -46.962 | 21 | -18.372 | -20.431 |
| 11 | -83.549 | -39.925 | 22 | 0 | 0 |
And fitting a curve equation of the outer chord line of the cross section of the blade 52 of the first-stage water turbine 311 shown in the table 1 and a curve equation of the inner chord line of the cross section of the blade 52 of the second-stage water turbine 311 shown in the formula (1) according to the linear coordinate parameters of the blade 52 of the first-stage water turbine 311 shown in the table 1.
yo1= -0.0001x 3- 0.0039x 2- 1.3492x+5.7122 （1）
In the formula (1), the reaction mixture is,yo1representing the chord line outside the section of blades 52 of first-stage turbine 311yThe coordinates of the position of the object to be imaged,xrepresenting the chord line outside the section of blades 52 of first-stage turbine 311xAnd (4) coordinates.
yi1= -0.0001x 3- 0.0143x 2- 1.4592x+0.0629 （2）
In the formula (2), the reaction mixture is,yi1representing chord lines in cross-section of blades 52 of first-stage turbine 311yThe coordinates of the position of the object to be imaged,xrepresenting chord lines in cross-section of blades 52 of first-stage turbine 311xAnd (4) coordinates.
And (3) fitting a section outer chord curve equation and a section inner chord curve equation of the blades of the second-stage water turbine 312 shown in the table 2 according to the linear coordinate parameters of the blades of the second-stage water turbine 312 shown in the table 2, wherein the section outer chord curve equation and the section inner chord curve equation are shown in the formula (4).
yo2= -0.0001x 3 +0.0019x 2 +1.3037x -4.1178 （3）
In the formula (3), the reaction mixture is,yo2representing the outer chord line of the cross-section of the blades of the secondary turbine 312yThe coordinates of the position of the object to be imaged,xrepresenting the outer chord line of the cross-section of the blades of the secondary turbine 312xAnd (4) coordinates.
yi2= -0.0001x 3 +0.0029x 2 +1.1619x -0.2491 （4）
In the formula (4), the reaction mixture is,yi2representing chord lines in cross-section of blades of secondary turbine 312yThe coordinates of the position of the object to be imaged,xrepresenting the outer chord line of the cross-section of the blades of the secondary turbine 312xAnd (4) coordinates.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. The utility model provides a two duct hydraulic turbine power generation system, includes interior duct (1), be equipped with hydraulic turbine power generation unit (3) in interior duct (1), its characterized in that: the outer side of the inner duct (1) is sleeved with an outer duct (2), and the water outlet sides of the inner duct (1) and the outer duct (2) are provided with a shared diffuser (4); the water turbine power generation unit (3) comprises a water turbine (31) and a generator (32) which are connected with each other, a front centrifugal self-cleaning pump blade (33) is arranged on the front side of the water turbine (31), a rear centrifugal self-cleaning pump blade (34) is arranged on the rear side of the water turbine, the diffuser (4) is of a multi-section annular structure or a spiral structure formed by guide plates, a nozzle is formed by a gap between every two adjacent guide plates, and the diffuser (4) is communicated with the rear side of the inner duct (1) through the nozzle; the nozzles are arranged in a stepped manner in the flow direction, and the size of the nozzles surrounding in the circumferential direction gradually increases in the flow direction.
2. The dual ducted water turbine power generation system in accordance with claim 1, wherein: the hydraulic turbine (31) comprises a first-level water turbine (311) and a second-level water turbine (312), the generator (32) comprises a first-level generator (321) and a second-level generator (322), a first-level main shaft (313) is connected between the first-level water turbine (311) and the first-level generator (321), a second-level main shaft (323) is connected between the second-level water turbine (312) and the second-level generator (322), the rotation directions of the first-level water turbine (311) and the second-level water turbine (312) are opposite, and the front centrifugal self-cleaning pump blades (33) are arranged on the front side of the first-level water turbine (311) and the rear side of the second-level water turbine (.
3. The dual ducted water turbine power generation system in accordance with claim 2, wherein: the inner duct (1) is a Venturi tube-shaped channel formed by a coaxially arranged inner duct front inner air guide sleeve (101) and an inner duct front outer air guide sleeve (102), the outer duct (2) is a Venturi tube contraction section-shaped channel formed by the coaxially arranged inner duct front outer air guide sleeve (102) and the outer duct outer air guide sleeve (201), a protective net (11) and a front rib plate (12) are sequentially arranged on the water inlet side of the water turbine power generation unit (3) in the inner duct (1), an inner duct rear inner air guide sleeve (13) and a rear rib plate (14) are sequentially arranged on the water outlet side of the water turbine power generation unit (3) in the inner duct (1), the diffuser (4) is arranged around the outer sides of the inner duct rear inner air guide sleeve (13) and the rear rib plate (14), and the diffuser (4) is arranged at the tail part of the inner duct front outer air guide sleeve (102), and the water outlet side of the outer duct (2) is communicated with the water outlet side of the inner duct (1) through a diffuser (4).
4. The dual ducted water turbine power generation system in accordance with claim 3, wherein: one-level generator (321) is arranged inside inner air guide sleeve (101) before the inner duct, two-level generator (322) is arranged inside inner air guide sleeve (13) behind the inner duct, and heat dissipation grooves arranged along the water flow direction are formed in the outer walls of inner air guide sleeve (101) and inner air guide sleeve (13) behind the inner duct.
5. The dual ducted water turbine power generation system according to any one of claims 2 to 4, wherein: the first-stage water turbine (311) is a variable flap water turbine, the variable flap water turbine comprises a hub (51), a plurality of blades (52) are arranged on the hub (51), the blades (52) are composed of a fixed main wing (521) and a flap (522) which can rotate relative to the main wing (521), and a control assembly (53) for driving the flap (522) to rotate is arranged in the hub (51).
6. The dual ducted water turbine power generation system in accordance with claim 5, wherein: the curve equation of the section outer chord line of the blade (52) of the first-stage water turbine (311) is shown as a formula (1), and the curve equation of the section inner chord line is shown as a formula (2); the curve equation of the section outer chord line of the blade of the second-stage water turbine (312) is shown as a formula (3), and the curve equation of the section inner chord line is shown as a formula (4);
yo1= -0.0001x 3- 0.0039x 2- 1.3492x+5.7122 （1）
in the formula (1), the reaction mixture is,yo1representing the chord line outside the section of the blades (52) of a primary turbine (311)yThe coordinates of the position of the object to be imaged,xrepresenting the chord line outside the section of the blades (52) of a primary turbine (311)xCoordinates;
yi1= -0.0001x 3- 0.0143x 2- 1.4592x+0.0629 （2）
in the formula (2), the reaction mixture is,yi1representing chord lines in cross-section of blades (52) of a first-stage water turbine (311)yThe coordinates of the position of the object to be imaged,xrepresenting chord lines in cross-section of blades (52) of a first-stage water turbine (311)xCoordinates;
yo2 = -0.0001x 3 +0.0019x 2 +1.3037x -4.1178 （3）
in the formula (3), the reaction mixture is,yo2representing the outer chord line of the cross section of the blades of a secondary turbine (312)yThe coordinates of the position of the object to be imaged,xrepresenting the outer chord line of the cross section of the blades of a secondary turbine (312)xCoordinates;
yi2= -0.0001x 3 +0.0029x 2 +1.1619x -0.2491 （4）
in the formula (4), the reaction mixture is,yi2representing the chord line in the cross section of the blades of a secondary turbine (312)yThe coordinates of the position of the object to be imaged,xrepresenting the chord line in the cross section of the blades of a secondary turbine (312)xAnd (4) coordinates.
7. The dual ducted water turbine power generation system in accordance with claim 6, wherein: the flap (522) is movably connected with the main wing (521) through a rotating shaft (523), an eccentric wheel assembly (524) is arranged at the root of the flap (522), the control assembly (53) comprises a rotating control rod (531) arranged in the hub (51), and an eccentric wheel driving assembly (532) for driving the eccentric wheel assembly (524) to rotate is arranged at the end part of the rotating control rod (531).
8. The dual ducted water turbine power generation system in accordance with claim 7, wherein: the eccentric wheel assembly (524) comprises a rotating disc (5241) and a poke rod (5242) which is eccentrically arranged on one side of the rotating disc (5241), the eccentric wheel driving assembly (532) comprises at least one polygonal column, the number of the side surfaces of the polygonal column is the same as that of blades (52) on a wheel hub (51), and each side surface of the polygonal column is in contact with the side wall of one poke rod (5242).
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| CN202468349U (en) * | 2011-12-29 | 2012-10-03 | 顾进发 | Self-cleaning reamer submersible sewage pump |
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| CN1828042A (en) * | 2006-03-10 | 2006-09-06 | 清华大学 | Runner of opposite-rotating through flow turbine capable of bidirectionally generating electricity |
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Effective date of registration: 20230919 Address after: No. 52 Quanzhou North Road, Ningxiang High tech Zone, Changsha City, Hunan Province, 410000 Patentee after: HUNAN HONGTAI EAST ELECTRICAL AND MECHANICAL EQUIPMENT Co.,Ltd. Address before: 410114 No. 960, Second Section of Wanjiali South Road, Tianxin District, Changsha City, Hunan Province Patentee before: CHANGSHA University OF SCIENCE AND TECHNOLOGY |