CN110439722B - Wear-resistant mixed-flow water turbine suitable for high water head, high rotating speed and high sand content - Google Patents
Wear-resistant mixed-flow water turbine suitable for high water head, high rotating speed and high sand content Download PDFInfo
- Publication number
- CN110439722B CN110439722B CN201910601497.5A CN201910601497A CN110439722B CN 110439722 B CN110439722 B CN 110439722B CN 201910601497 A CN201910601497 A CN 201910601497A CN 110439722 B CN110439722 B CN 110439722B
- Authority
- CN
- China
- Prior art keywords
- guide vane
- rotating wheel
- water turbine
- runner
- flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000004576 sand Substances 0.000 title claims abstract description 13
- 238000005299 abrasion Methods 0.000 claims abstract description 16
- 230000008859 change Effects 0.000 abstract description 3
- 230000010349 pulsation Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 238000011160 research Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- F03B3/16—Stators
- F03B3/18—Stator blades; Guide conduits or vanes, e.g. adjustable
-
- 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
- F03B3/183—Adjustable vanes, e.g. wicket gates
-
- 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
Landscapes
- 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 relates to an abrasion-resistant mixed-flow water turbine suitable for high water head, high rotating speed and high sand content, which comprises a volute, a fixed guide vane, a movable guide vane, a rotating wheel and a tail water pipe, wherein the molded lines of the movable guide vane are two symmetrical cubic curve groups, so that the flow velocity of a guide vane area and the resistance loss in a flow channel are smaller, the flow is smoother, and the abrasion of silt to the outlet area of the guide vane is effectively reduced; the newly designed long and short blade rotating wheel, the diameter of the rotating wheel, the wrap angle of the blades, the installation angle of the inlet of the blades and the change rule of the thickness of the blades from the inlet to the outlet can better match the structural strength of the flow field and the rotating wheel, and the abrasion of silt to the outlet edge of the rotating wheel is obviously reduced. The water turbine can greatly reduce the flow velocity of the guide vane area and the rotating wheel area, remarkably improve the abrasion resistance of the rotating wheel and the guide vane under the condition of high sand-containing water flow, reduce the vibration and pressure pulsation of a unit, remarkably prolong the overhaul and replacement period of the rotating wheel and the guide vane, and improve the operation stability and the safe operation life of the water turbine.
Description
Technical Field
The invention belongs to the technical field of fluid machinery and engineering equipment, particularly relates to a mixed-flow water turbine, and particularly relates to a low-specific-speed sand abrasion-resistant mixed-flow water turbine suitable for high water head, high rotating speed and high sand content.
Background
The sand content of water flow in a plurality of river channels in China is high, and the diameter of sand particles is large, so that the influence of sand abrasion on long-term stable operation of the water turbine is a factor needing to be considered in the design process. The mixed-flow turbine set is mostly adopted in a power station built on a sediment-rich river, and the flow channel forms are rich and diverse.
The main runner is characterized in that the rotating wheel adopts a lower rotating speed, however, the abrasion rate of the guide vane is far higher than that of the rotating wheel in the actual power station research, and the guide vane is a restriction factor influencing the normal operation of a unit and controlling the overhaul period. The reason is that in the high-head low-specific-speed francis turbine, the turbine can reach rated power when the guide vane is in a small opening, so that the absolute flow velocity of the guide vane is larger than the relative rotation velocity of the rotating wheel, and the silt abrasion part is gradually expanded from the rotating wheel to the guide vane. Meanwhile, the rotating wheel is matched with the flow velocity direction of the outlet of the guide vane, the inlet of the blade is seriously bent, and the flow velocity at the inlet and the outlet of the rotating wheel is higher. Resulting in a significant increase in the wear rate of both the runner and the vane.
Disclosure of Invention
In order to overcome a series of defects in the prior art, the invention aims to provide a wear-resistant mixed-flow water turbine to solve the problems in the background art.
The invention relates to an abrasion-resistant mixed-flow water turbine suitable for high water head, high rotating speed and high sand content, which comprises a volute (1), a fixed guide vane (2), a movable guide vane (3), a rotating wheel (4) and a draft tube (5), wherein,
the movable guide vane molded line is a closed curve formed by two symmetrical cubic curves, and the equation of the cubic curve is as follows:
y＝0.000003x3-0.006x2-0.112x+29.514
the runner (4) is structurally characterized in that a plurality of water turbine blades (7) are arranged on the lower side of a runner upper crown (8) at the upper part, a runner lower ring (6) coaxial with the runner upper crown (8) is arranged at the lower end of each water turbine blade (7), and the distance h from the highest point of the runner upper crown (8) in contact with the water turbine blades (7) to the highest point of the runner lower ring (6) corresponding to the water turbine blades (7) is 125-135 mm;
the middle sections of the long blades and the short blades of the water turbine blades (7) are closed curves formed by two sections of end-to-end connected curves.
The equations of the two curves of the long blade are respectively as follows:
y＝0.0000001x4+0.00001x3-0.0081x2+0.1904x+67.165
y＝0.00000001x4+0.00002x3-0.0103x2+0.4251x+62.951
the equations for the two curves for the short blade are:
y＝0.000002x4-0.0012x3+0.2179x2-18.193x+624.89
y＝0.0000006x4-0.002x3+0.0233x2-1.3429x+88.844
and adjusting the length of the straight cone of the tail water pipe (5) and the diameter of the inlet section to ensure that the height difference H from the center of the guide vane on the rotating wheel (4) to the bottom plate of the tail water pipe is 3200-and-3250 mm, and the diameter Dd of the inlet section is 650-and-680 mm.
The invention has the beneficial effects that:
1. the novel design is carried out by adopting the long and short blade rotating wheel, the diameter of the rotating wheel, the wrap angle of the blades, the installation angle of the inlet of the blades and the thickness change rule of the blades from the inlet to the outlet, so that the flow field and the structural strength of the rotating wheel are better matched, and the abrasion of silt to the outlet edge of the rotating wheel can be obviously reduced.
2. The flow velocity of the movable guide vane area and the resistance loss in the flow channel are smaller, the flow is smoother, and the abrasion of silt to the outlet area of the guide vane can be effectively reduced.
3. Compared with other existing units, the anti-silt abrasion performance of the runner and the guide vane is greatly improved, and the vibration, pressure pulsation and the dynamic stress of the runner blade are reduced, so that the probability of cracks of the runner blade is greatly reduced, and the operation stability and the safe operation life of the water turbine are improved.
Drawings
FIG. 1 is a schematic structural diagram of a francis turbine of the present invention;
FIG. 2 is a cross-sectional view of the runner of the francis turbine of the present invention;
FIG. 3 is a layout view of a fixed guide vane and a movable guide vane of the francis turbine of the present invention;
FIG. 4 is a schematic view of the shape of a movable guide vane of the francis turbine of the present invention;
FIG. 5 is a schematic intermediate cross-sectional view of a runner blade of the francis turbine of the present invention;
the reference numbers in the figures are:
1-a volute; 2-fixed guide vanes; 3-movable guide vanes; 4-turbine runner; 5-a draft tube; 6-rotating wheel lower ring; 7-turbine blades; 8-crown of the runner.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments and the directional terms described below with reference to the drawings are exemplary and intended to be used in the explanation of the invention, and should not be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In one broad embodiment of the present invention, the present invention provides an anti-wear mixed-flow water turbine adapted to high water head, high rotational speed and high sand content, and the present invention is further described with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, the water turbine includes a volute 1, a stationary guide vane 2, a movable guide vane 3, a turbine runner 4, and a draft tube 5.
As shown in fig. 2, the turbine runner 4 has a structure of: the lower side of the runner crown 8 at the upper part is provided with a plurality of water turbine blades 7, the lower end of each water turbine blade 7 is provided with a runner lower ring 6 which is coaxial with the runner crown 8, and the distance h from the highest point of the runner crown 8, which is in contact with the water turbine blades 7, to the highest point of the runner lower ring 6 corresponding to the water turbine blades 7 is 125-135mm, namely the height difference between the runner crown 8 and the runner lower ring surface.
As shown in fig. 3 and 4, the stationary guide vane 2 is located at the outer ring of the movable guide vane 3; in order to reduce the outlet speed of the guide vane and realize the purpose of reducing the abrasion, the shape of the movable guide vane 3 is designed into a symmetrical guide vane, and the tail part of the guide vane is specially designed, so that the thickness of the guide vane is reduced, the local speed is reduced, and the abrasion resistance of the guide vane is improved. The guide vane molded line is a closed curve formed by two symmetrical cubic curves, and the equation of the cubic curve is as follows:
y＝0.000003x3-0.0006x2-0.112x+29.514
as shown in fig. 2 and 5, in order to reduce the relative speed in the runner, improve the wear resistance of the runner, and comprehensively consider the factors of reasonable matching with the outflow of the guide vane, the hydraulic performance of the water turbine, the structural strength and the like, the research adopts a long-blade runner type and a short-blade runner type. The intermediate section of the long blade and the short blade of the water turbine blade is a closed curve formed by two curves connected end to end, and the equations of the two curves of the long blade are respectively as follows:
y＝0.0000001x4+0.00001x3-0.0081x2+0.1904x+67.165
y＝0.00000001x4+0.00002x3-0.0103x2+0.4251x+62.951
the equations for the two curves for the short blade are:
y＝0.00002x4-0.0012x3+0.2179x2-18.193x+624.89
y＝0.0000006x4-0.0002x3+0.0233x2-1.3429x+88.844
as shown in FIG. 1, the straight taper section length and the diameter of the inlet section of the draft tube 5 are increased, so that the height difference H from the center of the guide vane on the runner to the bottom plate of the draft tube is 3200-one 3250mm, and the diameter Dd of the inlet section is 650-one 680mm, thereby achieving the purposes of effectively recovering the energy in the draft tube, reducing the hydraulic loss and improving the unit efficiency.
The invention carries out numerical simulation and field test on a prototype francis turbine, analyzes the relative speed of the flow field of a runner and a guide vane area, analyzes the influence of the shape change of the runner on the energy performance, the cavitation performance and the stability, and analyzes the flow loss of each part of the runner and the hydraulic performance of different operation conditions. Through test data and practical effects, the flow velocity of the guide vane region and the guide vane region can be greatly reduced compared with other existing units by using the unit disclosed by the invention, and the abrasion resistance of the guide vane and the guide vane in a high-sand-content water flow condition is obviously improved. In addition, the vibration and pressure pulsation of the unit are reduced, the dynamic stress of the runner blades is reduced, the overhaul and replacement period of the runner and the guide vane in the sand-containing water flow can be obviously prolonged, and the operation stability and the safe operation life of the water turbine are improved.
Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (1)
1. An abrasion-resistant mixed-flow water turbine adapting to high water head, high rotating speed and high sand content, which comprises a volute (1), a fixed guide vane (2), a movable guide vane (3), a rotating wheel (4) and a draft tube (5),
the movable guide vane molded line is a closed curve formed by two symmetrical cubic curves, and the equation of the cubic curve is as follows:
y＝0.000003x3-0.0006x2-0.112x+29.514
the runner (4) is structurally characterized in that a plurality of water turbine blades (7) are arranged on the lower side of a runner upper crown (8) at the upper part, a runner lower ring (6) coaxial with the runner upper crown (8) is arranged at the lower end of each water turbine blade (7), and the distance h from the highest point of the runner upper crown (8) in contact with the water turbine blades (7) to the highest point of the runner lower ring (6) corresponding to the water turbine blades (7) is 125-135 mm;
the middle sections of the long blades and the short blades of the water turbine blades (7) are closed curves formed by two sections of end-to-end connected curves;
the equations of the two curves of the long blade are respectively as follows:
y＝0.0000001x4+0.00001x3-0.0081x2+0.1904x+67.165
y＝0.00000001x4+0.00002x3-0.0103x2+0.4251x+62.951
the equations for the two curves for the short blade are:
y＝0.000002x4-0.0012x3+0.2179x2-18.193x+624.89
y＝0.0000006x4-0.0002x3+0.0233x2-1.3429x+88.844
and adjusting the length of the straight cone of the tail water pipe (5) and the diameter of the inlet section to ensure that the height difference H from the center of the guide vane on the rotating wheel (4) to the bottom plate of the tail water pipe is 3200-and-3250 mm, and the diameter Dd of the inlet section is 650-and-680 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910601497.5A CN110439722B (en) | 2019-07-05 | 2019-07-05 | Wear-resistant mixed-flow water turbine suitable for high water head, high rotating speed and high sand content |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910601497.5A CN110439722B (en) | 2019-07-05 | 2019-07-05 | Wear-resistant mixed-flow water turbine suitable for high water head, high rotating speed and high sand content |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110439722A CN110439722A (en) | 2019-11-12 |
| CN110439722B true CN110439722B (en) | 2020-06-23 |
Family
ID=68428783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910601497.5A Active CN110439722B (en) | 2019-07-05 | 2019-07-05 | Wear-resistant mixed-flow water turbine suitable for high water head, high rotating speed and high sand content |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110439722B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59190480A (en) * | 1983-04-11 | 1984-10-29 | Toshiba Eng Co Ltd | Horizontal francis water wheel |
| CN1702317A (en) * | 2005-07-15 | 2005-11-30 | 清华大学 | Mixed flow water turbine with an eddy suppressor |
| CN102011672A (en) * | 2010-12-08 | 2011-04-13 | 清华大学 | Radial-axial flow turbine employing novel guide blade and runner blade profile |
| CN202756162U (en) * | 2011-12-09 | 2013-02-27 | 清华大学 | Mixed-flow water turbine adopting novel guide vane and runner blade molded lines |
| CN103696895A (en) * | 2013-12-19 | 2014-04-02 | 广东电网公司电力科学研究院 | Mixed-flow type water pump turbine |
| CN203962464U (en) * | 2014-06-04 | 2014-11-26 | 清华大学 | The mixed flow pump turbine runner of decline slant height flanging |
-
2019
- 2019-07-05 CN CN201910601497.5A patent/CN110439722B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59190480A (en) * | 1983-04-11 | 1984-10-29 | Toshiba Eng Co Ltd | Horizontal francis water wheel |
| CN1702317A (en) * | 2005-07-15 | 2005-11-30 | 清华大学 | Mixed flow water turbine with an eddy suppressor |
| CN102011672A (en) * | 2010-12-08 | 2011-04-13 | 清华大学 | Radial-axial flow turbine employing novel guide blade and runner blade profile |
| CN202756162U (en) * | 2011-12-09 | 2013-02-27 | 清华大学 | Mixed-flow water turbine adopting novel guide vane and runner blade molded lines |
| CN103696895A (en) * | 2013-12-19 | 2014-04-02 | 广东电网公司电力科学研究院 | Mixed-flow type water pump turbine |
| CN203962464U (en) * | 2014-06-04 | 2014-11-26 | 清华大学 | The mixed flow pump turbine runner of decline slant height flanging |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110439722A (en) | 2019-11-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102011672B (en) | Mixed flow turbine employing novel guide blade and runner blade profile | |
| WO2023077648A1 (en) | Self-adaptive design method for bulb tubular pump guide vane, and bulb tubular pump guide vane | |
| CN204591564U (en) | A kind of Francis turbine with exit guide vane | |
| CN101598138A (en) | Secondary splitter blade type centrifugal impeller | |
| CN107524557A (en) | A kind of multistage tidal current energy water turbine based on real-time, tunable kuppe corner | |
| CN101555859B (en) | Francis turbine runner with ultra-low specific rotating speed specially used for driving cooling tower fan | |
| CN105927458B (en) | A kind of extra low head backward flow type bell hydraulic turbine | |
| CN103912434A (en) | Small-hydropower axial flow turbine device | |
| CN109441691B (en) | Mixed-flow water turbine with tail water pipe and rectifying plate | |
| CN110439722B (en) | Wear-resistant mixed-flow water turbine suitable for high water head, high rotating speed and high sand content | |
| CN103114953A (en) | Mixed-flow type water turbine reversed S-shaped rotating wheel with long and short blades | |
| CN202194767U (en) | Novel rotating wheel of axial-flow hydraulic turbine | |
| CN100427753C (en) | Mixed flow type water turbin having H-type flow path rotary wheel | |
| CN202348525U (en) | Axial-flow rotary propeller type water turbine | |
| CN111535974A (en) | Low-water-head large-flow mixed-flow water turbine with double-inlet volute | |
| CN105863930B (en) | A kind of small all-in-one turbine-generator units | |
| CN111577508A (en) | High-specific-speed axial flow water turbine with double-inlet volute | |
| CN112360660B (en) | Long and short blade type reversible pump turbine | |
| CN107762965A (en) | A kind of axial-flow pump of high-lift low noise | |
| CN109798215B (en) | Novel ultra-low specific speed water pump turbine | |
| CN107829861B (en) | A kind of impulse turbine based on pyriform line airfoil fan | |
| CN201396234Y (en) | Super-low specific rotational speed mixed-flow type hydraulic turbine runner dedicated for driving cooling tower fan | |
| CN104499466A (en) | Tailrace tunnel with variable crest elevation | |
| CN105041547A (en) | Axial-flow type turbine runner with non-horizontal-shaft rotation blades | |
| CN220452232U (en) | Ten-stage axial flow compressor for large blast furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |