CN111594369A - Mixed-flow water turbine with double-inlet volute suitable for cooling tower - Google Patents
Mixed-flow water turbine with double-inlet volute suitable for cooling tower Download PDFInfo
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- CN111594369A CN111594369A CN202010395158.9A CN202010395158A CN111594369A CN 111594369 A CN111594369 A CN 111594369A CN 202010395158 A CN202010395158 A CN 202010395158A CN 111594369 A CN111594369 A CN 111594369A
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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
- 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
- F03B3/02—Machines or engines of reaction type; Parts or details peculiar thereto with radial flow at high-pressure side and axial flow at low-pressure side of rotors, e.g. Francis 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
- F03B3/12—Blades; Blade-carrying rotors
- F03B3/121—Blades, their form or construction
-
- 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
- F03B3/125—Rotors for radial flow at high-pressure side and axial flow at low-pressure side, e.g. for Francis-type turbines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Turbines (AREA)
Abstract
The invention discloses a mixed-flow water turbine with a double-inlet volute suitable for a cooling tower, wherein a seat ring is sleeved at an annular opening at the inner side of the double-inlet volute, a circle of movable guide vanes are arranged in the seat ring, a rotating wheel is sleeved at the inner ring of the seat ring, and a water drainage cone is sleeved at the inner ring of the rotating wheel; a tail water pipe is arranged at the bottom of the rotating wheel; the blades of the rotating wheel are of non-uniform thickness twisted structures, and the front surfaces and the back surfaces of the blades are smoothly connected through curved surfaces with different curvatures from top to bottom. According to the mixed-flow water turbine with the double-inlet volute, which is suitable for the cooling tower, the two water inlets are respectively communicated with the water inlet pipe of the cooling tower, so that bidirectional water inflow is realized, the uniformity of water flow in the volute in the circumferential direction is improved, the velocity component of the water flow in the circumferential direction is enhanced, the water flow circulation quantity of incoming flow is further effectively increased, the water flow condition entering the water distributor is improved, the hydraulic loss of the water distributor is reduced, and the mixed-flow water turbine has the advantages of good hydraulic performance, high operation efficiency and the like.
Description
Technical Field
The invention relates to a mixed-flow water turbine with a double-inlet volute suitable for a cooling tower, and belongs to the technical field of water turbines.
Background
In recent years, water turbines have been increasingly used in cooling towers in addition to generators to generate electricity. The cooling tower water turbine is driven by the complementary energy of the circulating cooling water to drive the fan to operate, and has the advantages of low consumption, environmental protection, energy conservation and the like. The mixed flow water turbine is one of the most widely used water turbines, and its main components include water guiding chamber, seat ring, water guiding mechanism, runner and tail pipe, and is suitable for low specific speed working condition.
In the market, a mixed-flow water turbine is also adopted as a cooling tower water turbine. The volute is used as a water diversion component of the water turbine, and has the function of enabling water flow to form a ring amount from the hydraulic viewpoint so as to ensure that the water flow can enter the seat ring and the movable guide vane at a smaller attack angle and reduce the hydraulic loss of the water guide mechanism.
In the prior art, all sections of the volute-shaped structure section are set to be oval, so that the diameter of the rotating wheel is effectively increased, and the output of a unit is increased. But it only changes the shape of the volute section and does not optimize the water inlet condition.
The existing volute is designed to be a one-way water inlet, and the section of the volute-shaped structure section is gradually reduced to form necessary annular quantity in front of the water distributor. When the water flow passes through the cross section of the inlet of the volute to the cross section of the nose end, the tangential component velocity change of the water flow is greatly influenced by the size of the cross section and cannot ideally form axisymmetric potential flow.
Therefore, how to overcome the defects of the prior art becomes one of the key problems to be solved in the technical field of the mixed-flow water turbine.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a mixed-flow water turbine with a double-inlet volute, which is suitable for a cooling tower.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a mixed-flow water turbine with a double-inlet volute suitable for a cooling tower comprises the double-inlet volute, wherein a seat ring is sleeved at an annular opening at the inner side of the double-inlet volute, a circle of movable guide vanes are arranged in the seat ring, a rotating wheel is sleeved at the inner ring of the seat ring, and a water drainage cone is sleeved at the inner ring of the rotating wheel; and a tail water pipe is arranged at the bottom of the rotating wheel.
Preferably, the dual-inlet volute comprises: the spiral structure section is provided with two nose end straight pipe sections in the circumferential direction respectively, and the inlet section of the spiral structure section is an oval section; the two nose end straight pipe sections are arranged in a centrosymmetric manner relative to the snail-shaped structure section.
Preferably, the ratio of the length of the major axis to the length of the minor axis of the oval section is 1.05-1.5: 1.
preferably, the runner is a mixed-flow runner.
As the preferred scheme, the blades of the runner adopt a non-uniform thickness twisted structure, and the front surface and the back surface of each blade are smoothly connected by curved surfaces with different curvatures from top to bottom.
Preferably, the number of the blades is 14-19.
Preferably, centers of the double-inlet volute, the seat ring, the rotating wheel and the draft tube are on the same vertical axis.
Preferably, the draft tube is of a straight conical structure.
Preferably, the section airfoil curves of the curved surfaces of the front surface and the back surface of the blade from top to bottom are set as follows:
at the position which is 100mm away from the transverse axis of the lower edge of the drainage cone, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝0.0018x2-1.44395x+390.86743
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝0.00187x2-1.50257x+399.45313
at a distance of 150mm from the transverse axis of the lower edge of the drainage cone, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝3.922×10-6x3-0.0021x2-0.09877x+213.81885
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝3.22687×10-6x3-0.00137x2-0.36516x+243.22
at the position which is 200mm away from the transverse axis of the lower edge of the drainage cone, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.2885×10-6x3-2.64996×10-4x2-0.70085x+261.97
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝3.5575×10-6x3-0.00185x2-0.087x+182.41278
the section airfoil curve formula of the curved surface of the front surface of the blade at the position 250mm away from the transverse axis of the lower edge of the drainage cone is as follows:
y＝7.71574×10-7x3+0.00168x2-1.48645x+360.08014
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝6.81816×10-6x3-0.00653x2+2.15092x-174.62416。
has the advantages that: the mixed-flow water turbine with the double-inlet volute suitable for the cooling tower provided by the invention adopts the double-inlet volute, the two water inlets are respectively communicated with the water inlet pipe of the cooling tower to realize bidirectional water inlet, the uniformity of water flow in the volute in the circumferential direction is improved, the velocity component of the water flow in the circumferential direction is enhanced, the water flow circulation quantity of incoming flow is further effectively increased, the water flow condition entering the water distributor is improved, the hydraulic loss of the water distributor is reduced, and the mixed-flow water turbine has the advantages of good hydraulic performance, high operation efficiency and the like.
Drawings
Fig. 1 is a schematic structural diagram of a francis turbine with a double-inlet volute suitable for a cooling tower according to the present invention.
Fig. 2 is a schematic structural diagram of a dual-inlet volute according to the present invention.
Fig. 3 is a schematic sectional view of a francis turbine with a double-inlet volute suitable for a cooling tower according to the present invention.
Fig. 4 is a schematic view of a vane according to the present invention in a forward direction.
Fig. 5 is a schematic top view of a blade according to the present invention.
FIG. 6 is a schematic view of airfoil profiles on the blades at different lateral axial distances from the lower edge of the bleed cone in accordance with the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, a francis turbine with a double-inlet volute suitable for a cooling tower sequentially comprises a double-inlet volute 1, a seat ring 2, movable guide vanes 3, a rotating wheel 4 and a tail water pipe 5 according to a water inlet direction, wherein the seat ring 2 is sleeved at an annular opening at the inner side of the double-inlet volute 1, a circle of movable guide vanes 3 are arranged in the seat ring 2, the rotating wheel 4 is sleeved at an inner ring of the seat ring 2, and a water drainage cone 6 is sleeved at an inner ring of the rotating wheel 4; and a tail water pipe 5 is arranged at the bottom of the rotating wheel 4.
As shown in fig. 2, the dual-inlet scroll 1 includes: snail form structure section 101, snail form structure section 101 circumferencial direction is provided with two nose straight tube sections 102 respectively, and the import cross-section of snail form structure section 101 is oval section, and the ratio of oval section major axis and minor axis length is 1.05 ~ 1.5: 1. the two nose straight pipe sections 102 are respectively used for being communicated with a water inlet pipe of the cooling tower.
As shown in fig. 3, the runner 4 is a mixed-flow runner, blades 401 of the runner 4 are of a non-uniform-thickness twisted structure, and the number of the blades is 14-19. As shown in fig. 4-5, the front and back surfaces of the blade are smoothly connected by curved surfaces with different curvatures from top to bottom, and the section airfoil curves of the curved surfaces of the front and back surfaces of the blade from top to bottom are set as follows:
as shown in FIG. 6, the numerical values of the point coordinates on the airfoil curves of the front and back sections of the blade at a distance of 100mm from the transverse axis of the lower edge of the bleed cone are shown in Table 1.
TABLE 1
The two curves fitted are respectively represented as:
the front side of the blade is as follows: y is 0.0018x2-1.44395x+390.86743
The reverse side of the blade: 0.00187x2-1.50257x+399.45313
The numerical values of the point coordinates on the airfoil curves of the front and back cross sections of the blade at a distance of 150mm from the transverse axis of the lower edge of the drainage cone are shown in table 2.
TABLE 2
The two curves fitted are respectively represented as:
front face of blade y 3.922 × 10-6x3-0.0021x2-0.09877x+213.81885
Blade reverse side y is 3.22687 × 10-6x3-0.00137x2-0.36516x+243.22
The numerical values of the point coordinates on the airfoil curves of the front and back sections of the blade at a distance of 200mm from the transverse axis of the lower edge of the drainage cone are shown in Table 3.
TABLE 3
The two curves fitted are respectively represented as:
front face of blade y 2.2885 × 10-6x3-2.64996×10-4x2-0.70085x+261.97
Blade reverse side y is 3.5575 × 10-6x3-0.00185x2-0.087x+182.41278
The numerical values of the point coordinates on the airfoil curves of the front and back sections of the blade at a distance of 250mm from the transverse axis of the lower edge of the drainage cone are shown in Table 4.
TABLE 4
The two curves fitted are respectively represented as:
front face of blade y 7.71574 × 10-7x3+0.00168x2-1.48645x+360.08014
Blade reverse side y is 6.81816 × 10-6x3-0.00653x2+2.15092x-174.62416
The centers of the double-inlet volute, the seat ring, the rotating wheel and the draft tube are on the same vertical axis.
The two nose end straight pipe sections are arranged in a centrosymmetric manner relative to the snail-shaped structure section.
The tail water pipe adopts a straight cone-shaped structure, and the water outlet of the tail water pipe is used for communicating a water pipe of a cooling tower circulating water system.
Example 1:
taking a mixed-flow water turbine applying the double-inlet volute provided by the invention to a certain cooling tower as an example, the rated shaft power of a fan of the cooling tower is 98kW, and the surplus water head of circulating cooling water is 14 m.
The optimized parameters of the invention are as follows: two nose straight tube sections in the circumferential direction of the volute structure section are arranged in a centrosymmetric manner about the volute structure section, the inlet section of the volute structure section is an elliptical section, and the ratio of the long axis to the short axis of the elliptical section is 1.1: 1; the number of movable guide vanes is 16; the diameters of the inlet and the outlet of the mixed-flow runner are 1200mm and 800mm respectively; the blades adopt a non-uniform thickness twisted structure, and the number of the blades is 19; the draft tube adopts a straight cone-shaped draft tube with a cone angle of 12 degrees.
Example 2:
the optimized parameters of the invention are as follows: two nose straight tube sections in the circumferential direction of the volute structure section are arranged in a centrosymmetric manner about the volute structure section, the inlet cross section of the volute structure section is an elliptical cross section, and the ratio of the long axis to the short axis of the elliptical cross section is 1.05: 1; the number of movable guide vanes is 16; the diameters of the inlet and the outlet of the mixed-flow runner are 1200mm and 800mm respectively; the blades adopt a non-uniform thickness twisted structure, and the number of the blades is 16; the draft tube adopts a straight cone-shaped draft tube with a cone angle of 12 degrees.
Example 3:
the optimized parameters of the invention are as follows: two nose straight tube sections in the circumferential direction of the volute structure section are arranged in a centrosymmetric manner relative to the volute structure section, the inlet cross section of the volute structure section is an elliptical cross section, and the ratio of the long axis to the short axis of the elliptical cross section is 1.15: 1; the number of movable guide vanes is 16; the diameters of the inlet and the outlet of the mixed-flow runner are 1200mm and 800mm respectively; the blades adopt a non-uniform thickness twisted structure, and the number of the blades is 14; the draft tube adopts a straight cone-shaped draft tube with a cone angle of 14 degrees.
Example 4:
the specific application process of the invention is as follows: two nose straight tube sections of the double-inlet volute are directly communicated with a water inlet pipe of the cooling tower, water flows into the rotating wheel through the water guide mechanism to drive the rotating wheel to rotate, the potential energy of the water is converted into mechanical energy to drive the water turbine to operate, and the tail water pipe is directly communicated with a water pipe of a circulating water system of the cooling tower.
Descriptions not related to the embodiments of the present invention are well known in the art, and may be implemented by referring to the well-known techniques.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (9)
1. The utility model provides a mixed flow turbine of taking two import formula volutes suitable for cooling tower which characterized in that: the double-inlet volute comprises a double-inlet volute, wherein a seat ring is sleeved at an annular opening at the inner side of the double-inlet volute, a circle of movable guide vanes are arranged in the seat ring, a rotating wheel is sleeved at the inner ring of the seat ring, and a water drainage cone is sleeved at the inner ring of the rotating wheel; and a tail water pipe is arranged at the bottom of the rotating wheel.
2. A francis turbine with a dual-inlet volute adapted for use in a cooling tower according to claim 1, wherein: the dual-inlet volute comprises: the spiral structure section is provided with two nose end straight pipe sections in the circumferential direction respectively, and the inlet section of the spiral structure section is an oval section; the two nose end straight pipe sections are arranged in a centrosymmetric manner relative to the snail-shaped structure section.
3. A francis turbine with a dual-inlet volute adapted for use in a cooling tower according to claim 2, wherein: the ratio of the length of the long semi-axis to the length of the short semi-axis of the oval section is 1.05-1.5: 1.
4. a francis turbine with a dual-inlet volute adapted for use in a cooling tower according to claim 1, wherein: the rotating wheel is a mixed-flow rotating wheel.
5. A francis turbine with a dual-inlet volute adapted for use in a cooling tower according to claim 1, wherein: the blades of the rotating wheel are of non-uniform thickness twisted structures, and the front surfaces and the back surfaces of the blades are smoothly connected through curved surfaces with different curvatures from top to bottom.
6. The francis turbine of claim 5, wherein the francis turbine is adapted to a cooling tower and has a double-inlet volute, and the francis turbine further comprises: the number of the blades is 14-19.
7. A francis turbine with a dual-inlet volute adapted for use in a cooling tower according to claim 1, wherein: the centers of the double-inlet volute, the seat ring, the rotating wheel and the draft tube are on the same vertical axis.
8. A francis turbine with a dual-inlet volute adapted for use in a cooling tower according to claim 1, wherein: the draft tube adopts a straight conical structure.
9. The francis turbine of claim 5, wherein the francis turbine is adapted to a cooling tower and has a double-inlet volute, and the francis turbine further comprises: the front surface and the back surface of the blade are arranged as follows from top to bottom according to the section airfoil curve of the curved surface:
at the position which is 100mm away from the transverse axis of the lower edge of the drainage cone, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝0.0018x2-1.44395x+390.86743
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝0.00187x2-1.50257x+399.45313
at a distance of 150mm from the transverse axis of the lower edge of the drainage cone, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝3.922×10-6x3-0.0021x2-0.09877x+213.81885
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝3.22687×10-6x3-0.00137x2-0.36516x+243.22
at the position which is 200mm away from the transverse axis of the lower edge of the drainage cone, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.2885×10-6x3-2.64996×10-4x2-0.70085x+261.97
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝3.5575×10-6x3-0.00185x2-0.087x+182.41278
the section airfoil curve formula of the curved surface of the front surface of the blade at the position 250mm away from the transverse axis of the lower edge of the drainage cone is as follows:
y＝7.71574×10-7x3+0.00168x2-1.48645x+360.08014
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝6.81816×10-6x3-0.00653x2+2.15092x-174.62416。
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| CN202010395158.9A CN111594369A (en) | 2020-05-11 | 2020-05-11 | Mixed-flow water turbine with double-inlet volute suitable for cooling tower |
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| CN202010395158.9A CN111594369A (en) | 2020-05-11 | 2020-05-11 | Mixed-flow water turbine with double-inlet volute suitable for cooling tower |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114593514A (en) * | 2020-12-03 | 2022-06-07 | 阿自倍尔株式会社 | Hydraulic turbine type flow control device |
| CN115405454A (en) * | 2022-08-31 | 2022-11-29 | 扬州大学 | Multifunctional mixed-flow water turbine and automatic adjusting system |
| CN115822839A (en) * | 2022-11-19 | 2023-03-21 | 江苏大学流体机械温岭研究院 | Energy recovery turbine draft tube with guide vanes |
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| CN114593514A (en) * | 2020-12-03 | 2022-06-07 | 阿自倍尔株式会社 | Hydraulic turbine type flow control device |
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| CN115822839A (en) * | 2022-11-19 | 2023-03-21 | 江苏大学流体机械温岭研究院 | Energy recovery turbine draft tube with guide vanes |
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Application publication date: 20200828 |
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| RJ01 | Rejection of invention patent application after publication |