CN114876858A - Vortex generator applied to centrifugal pump - Google Patents
Vortex generator applied to centrifugal pump Download PDFInfo
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- CN114876858A CN114876858A CN202210415133.XA CN202210415133A CN114876858A CN 114876858 A CN114876858 A CN 114876858A CN 202210415133 A CN202210415133 A CN 202210415133A CN 114876858 A CN114876858 A CN 114876858A
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- vortex
- vortex generator
- centrifugal pump
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- 239000000178 monomer Substances 0.000 claims abstract description 26
- 238000009434 installation Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000411 inducer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2261—Rotors specially for centrifugal pumps with special measures
- F04D29/2272—Rotors specially for centrifugal pumps with special measures for influencing flow or boundary layer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a vortex generator applied to a centrifugal pump, wherein a vortex generator group is formed by a plurality of vortex generator monomers and is arranged at the front end of a suction surface of a centrifugal pump blade, in the paired vortex generator groups, two monomers are respectively rotated inwards, the included angle between the two monomers and a middle symmetrical line is 18 degrees, a monomer model is of a triangular wing type structure, and the whole structure is vertical to the surface of the blade. The vortex generator is used for disturbing the incoming flow at the front end of the blade, forming a vortex on the inner side of the model group, expanding and developing towards a downstream area, and then generating an impact effect on cavitation bubbles generated in the middle area of the impeller flow passage due to the reduction of local pressure, so that the development of cavitation is inhibited or weakened.
Description
Technical Field
The invention relates to the field of fluid machinery, in particular to a vortex generator applied to a centrifugal pump.
Background
The centrifugal pump is widely applied to the fields of energy, chemical engineering, electric power and the like due to compact structure and reliable operation. During operation of a centrifugal pump, the phenomenon of vaporization and liquefaction occurs due to a pressure drop in a localized region within the impeller flowpath, known as cavitation. When the cavitation is serious, the cavitation is accompanied by some obvious physical phenomena such as noise, vibration and the like, and even can cause the erosion damage of equipment materials.
In the marine field, more research has been conducted on the use of vortex generators to control cavitation of propellers, and less research has been conducted in the field of centrifugal pumps. For the vortex generator applied in the centrifugal pump, the vortex generated by the vortex generator is mainly used for controlling the growth and development of cavitation bubbles, so that the blocking effect of the attached cavitation bubbles on a flow channel is reduced, and the aim of improving the cavitation performance is finally fulfilled.
At present, cavitation control of a centrifugal pump comprises methods of changing a wrap angle and roughness of a blade, adding an inducer and the like, but the methods either need to recast the blade or need to consider whether to be adaptive or not, and the implementation process is complex. Therefore, it is necessary to find a simple and convenient method to replace the conventional complicated cavitation control method.
Disclosure of Invention
Considering that cavitation is still a big problem in the field of hydraulic machinery at present, the invention provides a vortex generator applied to a centrifugal pump, which can effectively control cavitation by generating a vortex to impact and destroy attached cavitation bubbles in a flow passage.
To achieve the above object, the present invention provides a vortex generator comprising:
further, the model monomer is the triangular prism column structure, includes: the device comprises a rectangular bottom surface 1, a parallelogram incident flow surface 2, a triangular inner side surface 3, a triangular outer side surface 4 and a rectangular back surface 5;
further, the rectangular bottom surface 1 is used for being connected with the surface of a centrifugal pump blade;
further, the triangular inner side surface 3 is connected with the bottom surface 1, and an inner side vortex generation area is formed between the adjacent inner side wall surfaces 3 and is used for manufacturing inner side vortices between the paired model monomers;
further, the triangular outer side surface 4 is connected with the bottom surface 1, and an outer vortex generating area is formed between the adjacent outer side wall surfaces 4 and is used for manufacturing outer vortices between the paired model monomers;
furthermore, the parallelogram incident flow surface 2 is connected with the bottom surface 1 at an angle and used for blocking the flow of the incoming flow;
further, the rectangular back surface 5 is in contact with the bottom surface 1, and a vortex mixing area for mixing the inner vortex and the outer vortex is formed in the rear area thereof.
Optionally, the vortex generator further comprises:
furthermore, the rectangular bottom surface is respectively connected with a parallelogram incident flow surface and a rectangular back surface, and the length of the connecting edge is delta; the side length of the bottom edge of the side face of the triangle is 3.8 delta, the bottom edge of the side face of the triangle is in common with the long edge of the rectangle on the bottom face, the side length of the first side edge of the side face of the triangle is 4 delta, the first side edge of the side face of the triangle is in common with the long edge of the parallelogram, the side length of the second side edge of the side face of the triangle is 2.5 delta, and the second side edge of the triangle is in common with the long edge of the back face of the rectangle.
Furthermore, the vortex generator model single body is turned, and the turned model single body is welded on a centrifugal pump blade.
Furthermore, the pairwise model monomers are arranged in an internal rotation symmetry mode.
Further, the installation angle of the model monomer which is arranged in an internal rotation symmetrical mode is 18 degrees, and the installation angle is an included angle between the bottom edge of the side face of the model monomer and the symmetry line of the model.
Further, the distance between the front edges of the two model monomers which are arranged in the internal rotation symmetry mode is 4 delta.
Further, the distance between the trailing edges of the two adjacent groups of vortex generator monomers which are arranged in the internal rotation symmetry is 4 delta.
Further, the vortex generators are arranged at positions where cavitation is easy to occur, wherein the length of the back of the blade is 10% -30%.
Technical effects
Compared with the prior art, the invention has the beneficial effects that:
a vortex generator group is formed by a plurality of vortex generator monomers, and the two vortex generator monomers are arranged on the back of the blade in an internal rotation symmetrical mode. Because the arrangement mode has a certain angle with the incoming flow direction, a large number of vortexes can be manufactured in the inner vortex generation area of the paired vortex generators and the outer vortex generation area of the adjacent vortex generators, attached cavitation bubbles blocking a flow channel are reduced, and the cavitation performance of the centrifugal pump is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a vortex generator according to the present invention;
FIG. 2 is a schematic view of a flow path of a vortex generator according to the present invention;
FIG. 3 is a schematic view of the arrangement of the vortex generators of the present invention on the suction side of a centrifugal pump blade;
FIG. 4 is a schematic view of a detail of the arrangement on the suction side of a centrifugal pump blade of the vortex generator of the present invention;
FIG. 5 is a graph comparing cavitation performance curves for vortex generators of the present invention;
in fig. 1: 1. a bottom surface; 2. the head-on surface; 3. an inner side surface; 4. an outer side surface; 5. a back side;
in fig. 3: 6. a group of vortex generators; 7. a blade suction surface; 8. a blade leading edge.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the embodiments described herein are only a part of the embodiments of the present invention, but not all of the embodiments. 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.
The invention aims to provide a vortex generator to improve the cavitation performance of a centrifugal pump
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a structural diagram of a vortex generator according to an embodiment of the present invention, and as shown in fig. 1, the present invention provides a vortex generator including:
a plurality of two liang of paired model monomers, the model monomer is the triangular prism structure, includes: the rectangular bottom surface, the triangular inner and outer side surfaces, the parallelogram incident surface and the rectangular back surface;
the rectangular bottom surface is used for being connected with the surface of a centrifugal pump blade; the triangular inner side surface is connected with the bottom surface, and an inner side vortex generation area is formed between the adjacent inner side wall surfaces and is used for manufacturing inner side vortices between the paired model monomers; the triangular outer side surface is connected with the bottom surface, and an outer eddy generation area is formed between the adjacent outer side wall surfaces and is used for manufacturing outer eddy between the paired model monomers; the parallelogram incident surface is connected with the bottom surface at an angle and used for blocking the flow of the incoming flow; the rectangular back surface is connected with the bottom surface, and a vortex mixing area is formed in the back area of the rectangular back surface and is used for mixing the inner vortex and the outer vortex.
Specifically, the rectangular bottom surface is respectively connected with a parallelogram incident flow surface and a rectangular back surface, and the length of the connecting edge is delta; the side length of the bottom edge of the side face of the triangle is 3.8 delta, the bottom edge of the side face of the triangle is in common with the long edge of the rectangle on the bottom face, the side length of the first side edge of the side face of the triangle is 4 delta, the first side edge of the side face of the triangle is in common with the long edge of the parallelogram, the side length of the second side edge of the side face of the triangle is 2.5 delta, and the second side edge of the triangle is in common with the long edge of the back face of the rectangle.
In this embodiment, the vortex generator model single body is turned, and the turned model single body is welded on the centrifugal pump blade.
In this embodiment, the two paired model monomers are arranged in an internal rotation symmetry manner.
In this embodiment, the installation angle of the model single bodies which are arranged in an internal rotation symmetry manner is 18 °, and the installation angle is an included angle between the bottom side of the side surface of the model single body and the symmetry line of the model.
In the embodiment, the distance between the leading edges of the two model monomers which are arranged in the internal rotation symmetry mode is 4 delta.
In the embodiment, the distance between the trailing edges of the two adjacent groups of vortex generator single bodies which are arranged in the internal rotation symmetry is 4 delta.
In this embodiment, the vortex generators are installed at locations where cavitation is likely to occur 5% -30% of the length of the back of the blade.
The simulation proves that the vortex generator can improve the cavitation performance of the centrifugal pump.
As shown in fig. 5, which is a comparison graph of cavitation curves of a prototype blade and a blade provided with a vortex generator, it can be known from the graph that when the cavitation margin is less than a curve segment of 2.5m, the lift of a centrifugal pump provided with a vortex generator is more slowly reduced under the action of cavitation, and the cavitation margin of the lift is smaller, thereby illustrating that the cavitation condition in the centrifugal pump can be improved by the vortex generator.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist in understanding the core concepts of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A vortex generator for use in a centrifugal pump, the vortex generator comprising: a plurality of two liang of paired model monomers, the model monomer is the triangular prism structure, includes: the device comprises a rectangular bottom surface (1), a parallelogram incident surface (2), a triangular inner side surface (3), a triangular outer side surface (4) and a rectangular back surface (5);
the rectangular bottom surface (1) is used for being connected with the surface of a centrifugal pump blade;
the triangular inner side surface (3) is connected with the bottom surface (1), and an inner side vortex generation area is formed between the adjacent inner side wall surfaces and is used for manufacturing inner side vortices between the paired model monomers;
the triangular outer side surface (4) is connected with the bottom surface (1), and an outer vortex generating area is formed between adjacent outer side wall surfaces and is used for manufacturing outer vortices between the paired model monomers;
the parallelogram incident flow surface (2) is connected with the bottom surface (1) at an angle and used for blocking the flow of the incoming flow;
the rectangular back surface (5) is connected with the bottom surface (1), and a vortex mixing area is formed in the rear area of the rectangular back surface and used for mixing the inner vortex and the outer vortex.
2. The vortex generator applied to a centrifugal pump according to claim 1, further comprising:
the rectangular bottom surface (1) is respectively connected with the parallelogram incident flow surface (2) and the rectangular back surface (5), and the length of the connecting edge is delta;
the length of side of triangle-shaped side base is 3.8 delta, triangle-shaped side base with rectangle back (5) long limit is on a common side, the length of side of triangle-shaped side first side is 4 delta, triangle-shaped side first side with parallelogram incident flow face (2) long limit is on a common side, the length of side of triangle-shaped side second side is 2.5 delta, triangle-shaped second side and rectangle back (5) long limit are on a common side.
3. The vortex generator applied to the centrifugal pump is characterized in that the model single bodies are machined in a turning mode, and the machined model single bodies are welded to the centrifugal pump blades.
4. The vortex generator applied to the centrifugal pump as claimed in claim 1, wherein the model monomers paired two by two are arranged in an internal rotation symmetry.
5. The vortex generator applied to the centrifugal pump is characterized in that the installation angle of the model single bodies which are arranged in the internal rotation symmetry mode is 18 degrees, and the installation angle is the included angle between the rectangular bottom surface (1) of the model single body and the symmetry line of the model single body.
6. The vortex generator applied to the centrifugal pump according to claim 4, wherein the distance between the leading edges of the two model monomers in the internal rotation symmetrical arrangement is 4 δ.
7. The vortex generator applied to the centrifugal pump according to claim 4, wherein the interval between the trailing edges of the two adjacent sets of vortex generators in the internal rotation symmetry arrangement is 4 δ.
8. Vortex generator for application in centrifugal pumps according to claim 1, characterized in that it is mounted on the suction surface (7) of the blade in the form of a group (6) of vortex generators, 10-30% of the locations susceptible to cavitation from the leading edge (8) of the blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210415133.XA CN114876858A (en) | 2022-04-20 | 2022-04-20 | Vortex generator applied to centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210415133.XA CN114876858A (en) | 2022-04-20 | 2022-04-20 | Vortex generator applied to centrifugal pump |
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| Publication Number | Publication Date |
|---|---|
| CN114876858A true CN114876858A (en) | 2022-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210415133.XA Pending CN114876858A (en) | 2022-04-20 | 2022-04-20 | Vortex generator applied to centrifugal pump |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203463240U (en) * | 2013-09-09 | 2014-03-05 | 庄岳兴 | Vortex generator, vortex generator unit plate and wind turbine blade with vortex generators |
| CN103974878A (en) * | 2011-07-22 | 2014-08-06 | Lmwp专利控股有限公司 | A vortex generator arrangement for an airfoil |
| CN109611356A (en) * | 2018-11-30 | 2019-04-12 | 泛仕达机电股份有限公司 | A kind of backward centrifugal blower |
| CN209539646U (en) * | 2019-01-24 | 2019-10-25 | 大连海事大学 | A kind of bionical leading edge blade of INVESTIGATION ON A HIGH SPEED CENTRIFUGAL COMPRESSOR and impeller |
| CN213981328U (en) * | 2020-12-25 | 2021-08-17 | 西安理工大学 | Centrifugal pump impeller for inhibiting air mass retention |
| CN216241499U (en) * | 2021-11-12 | 2022-04-08 | 重庆交通大学 | Cavitation-resistant flow guide structure suitable for centrifugal pump |
-
2022
- 2022-04-20 CN CN202210415133.XA patent/CN114876858A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103974878A (en) * | 2011-07-22 | 2014-08-06 | Lmwp专利控股有限公司 | A vortex generator arrangement for an airfoil |
| CN203463240U (en) * | 2013-09-09 | 2014-03-05 | 庄岳兴 | Vortex generator, vortex generator unit plate and wind turbine blade with vortex generators |
| CN109611356A (en) * | 2018-11-30 | 2019-04-12 | 泛仕达机电股份有限公司 | A kind of backward centrifugal blower |
| CN209539646U (en) * | 2019-01-24 | 2019-10-25 | 大连海事大学 | A kind of bionical leading edge blade of INVESTIGATION ON A HIGH SPEED CENTRIFUGAL COMPRESSOR and impeller |
| CN213981328U (en) * | 2020-12-25 | 2021-08-17 | 西安理工大学 | Centrifugal pump impeller for inhibiting air mass retention |
| CN216241499U (en) * | 2021-11-12 | 2022-04-08 | 重庆交通大学 | Cavitation-resistant flow guide structure suitable for centrifugal pump |
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Application publication date: 20220809 |