CN113239497A - Method and system for determining placement angle of centrifugal pump impeller inlet - Google Patents
Method and system for determining placement angle of centrifugal pump impeller inlet Download PDFInfo
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- 239000000411 inducer Substances 0.000 claims abstract description 156
- 239000007788 liquid Substances 0.000 claims abstract description 56
- 238000004364 calculation method Methods 0.000 claims abstract description 36
- 239000012530 fluid Substances 0.000 claims description 34
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Abstract
The invention discloses a method and a system for determining an installation angle of an impeller inlet of a centrifugal pump. The method comprises the following steps: constructing an inducer grid model; determining at least three circular lines on an exit face of the inducer grid model; calculating the inducer outlet liquid flow angle of the circular line by adopting a flow field calculation method; and calculating the placement angle of the impeller inlet of the centrifugal pump based on the liquid flow angle of the outlet of the inducer. The invention enables the inducer and the centrifugal pump impeller to be matched in a cooperative manner, thereby improving the efficiency of the centrifugal pump.
Description
Technical Field
The invention relates to the field of centrifugal pump design, in particular to a method and a system for determining an installation angle of an impeller inlet of a centrifugal pump.
Background
The inducer is arranged in front of the impeller of the centrifugal pump, which is one of main measures for improving the cavitation performance of the centrifugal pump, has certain working capacity, and can avoid cavitation in the impeller of the centrifugal pump by improving the liquid pressure at the suction inlet of the impeller, thereby ensuring the stable operation of a pump unit. However, at present, a cooperative matching design solution between the inducer and the impeller of the centrifugal pump is lacked, so that the inducer is installed in front of the impeller, and the following problems exist: because the impeller inlet placing angle of the centrifugal pump is determined by the impeller inlet flow field structure, fluid has certain circulation quantity after passing through the preposed inducer, and the circulation quantity can reset the impeller inlet flow field structure, so that the impeller inlet liquid flow angle deviates from the impeller inlet placing angle in a large range, the impeller inlet attack angle is increased, the impact loss at the inlet is increased, and the efficiency of the centrifugal pump is reduced.
Disclosure of Invention
Based on this, it is necessary to provide a method and a system for determining a placement angle of an inlet of a centrifugal pump impeller, in which the placement angle of the inlet of the centrifugal pump impeller is determined by an inducer outlet flow field structure, so that the inducer and the centrifugal pump impeller are cooperatively matched, thereby improving the efficiency of the centrifugal pump.
In order to achieve the purpose, the invention provides the following scheme:
a method of determining a placement angle of an inlet of a centrifugal pump impeller, comprising:
constructing an inducer grid model;
determining at least three circular lines on an exit face of the inducer grid model;
calculating an inducer outlet liquid flow angle of the circular line by adopting a flow field calculation method;
and calculating the placement angle of the inlet of the centrifugal pump impeller based on the inducer outlet liquid flow angle.
Optionally, the constructing of the inducer grid model specifically includes:
constructing a three-dimensional model of the variable-pitch inducer;
carrying out three-dimensional geometric modeling on an inducer fluid domain of the variable-pitch inducer three-dimensional model to obtain a fluid domain geometric model;
and carrying out meshing on the fluid domain geometric model to obtain the inducer mesh model.
Optionally, the determining at least three circular lines on the exit surface of the inducer grid model specifically includes:
determining a first circular line, a second circular line and a third circular line on an exit face of the inducer mesh model; the first round line is a streamline which is located on an outlet face of the inducer grid model and is a first set distance away from the hub; the second round line is a streamline located in the middle of an outlet face of the inducer grid model; and the third round line is a streamline which is positioned on the exit surface of the inducer grid model and is a second set distance away from the wheel rim.
Optionally, the calculating the inducer outlet fluid flow angle of the circular line by using a flow field calculation method specifically includes:
setting a boundary condition;
selecting a set number of points on the circular line;
calculating the circumferential component velocity and the axial velocity of each point by adopting a flow field calculation method based on the boundary condition;
calculating an outlet flow angle of a corresponding point according to the circumferential direction component velocity and the axial velocity;
and calculating the average value of the outlet liquid flow angles of all the points on the circular line to obtain the outlet liquid flow angle of the inducer.
Optionally, calculating a centrifugal pump impeller inlet setting angle based on the inducer outlet liquid flow angle specifically includes:
and calculating the setting angle of the inlet of the centrifugal pump impeller according to the liquid flow angle and the attack angle of the outlet of the inducer.
The invention also provides a system for determining the placement angle of the inlet of the centrifugal pump impeller, which comprises the following components:
the model construction module is used for constructing an inducer grid model;
a circle line determination module for determining at least three circle lines on an exit face of the inducer grid model;
the liquid flow angle calculation module is used for calculating the inducer outlet liquid flow angle of the circular line by adopting a flow field calculation method;
and the mounting angle calculation module is used for calculating a mounting angle of an inlet of the centrifugal pump impeller based on the inducer outlet liquid flow angle.
Optionally, the model building module specifically includes:
the first construction unit is used for constructing a three-dimensional model of the variable-pitch inducer;
the second construction unit is used for carrying out three-dimensional geometric modeling on an inducer fluid domain of the variable-pitch inducer three-dimensional model to obtain a fluid domain geometric model;
and the dividing unit is used for carrying out grid division on the fluid domain geometric model to obtain the inducer grid model.
Optionally, the circle line determining module specifically includes:
a circle line determination unit configured to determine a first circle line, a second circle line, and a third circle line on an exit surface of the inducer mesh model; the first round line is a streamline which is located on an outlet face of the inducer grid model and is a first set distance away from the hub; the second round line is a streamline located in the middle of an outlet face of the inducer grid model; and the third round line is a streamline which is positioned on the exit surface of the inducer grid model and is a second set distance away from the wheel rim.
Optionally, the liquid flow angle calculation module specifically includes:
a boundary condition setting unit for setting a boundary condition;
a selecting unit for selecting a set number of points on the circular line;
the first calculating unit is used for calculating the circumferential component velocity and the axial velocity of each point by adopting a flow field calculating method based on the boundary condition;
the second calculation unit is used for calculating an outlet liquid flow angle of the corresponding point according to the circumferential direction component velocity and the axial velocity;
and the third calculating unit is used for calculating the average value of the outlet liquid flow angles of all the points on the circular line to obtain the outlet liquid flow angle of the inducer.
Optionally, the placement angle calculating module specifically includes:
and the mounting angle calculation unit is used for calculating the mounting angle of the centrifugal pump impeller inlet according to the inducer outlet liquid flow angle and the attack angle.
Compared with the prior art, the invention has the beneficial effects that:
the embodiment of the invention provides a method and a system for determining a centrifugal pump impeller inlet placement angle. The inlet of the centrifugal pump impeller is arranged by the inducer outlet flow field structure, so that the inducer and the centrifugal pump impeller are matched in a synergistic manner, and the efficiency 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 pump configuration with an inducer positioned in front of the impeller of the centrifugal pump;
FIG. 2 is a flow chart of a method for determining a placement angle of an inlet of a centrifugal pump impeller according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a three-dimensional model of a variable pitch inducer according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a fluid domain geometric model provided by an embodiment of the invention;
FIG. 5 is a schematic diagram of an inducer grid model provided by an embodiment of the invention;
FIG. 6 is a schematic diagram of three circular line positions provided by an embodiment of the present invention;
FIG. 7 is an angular distribution diagram of the exit flow angles of three circular lines provided by an embodiment of the present invention;
fig. 8 is a block diagram of a centrifugal pump impeller inlet placement angle determination system according to an embodiment of the present invention.
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 it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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.
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.
As shown in fig. 1, the placement of the inducer 2 before the centrifugal pump impeller 1 improves the cavitation performance of the centrifugal pump. However, the improvement of the cavitation performance generally comes at the expense of partial efficiency of the centrifugal pump device, on one hand, the cavitation occurs in a runner of the inducer, the hydraulic loss is increased, on the other hand, the inducer adopts a low hub ratio and large wrap angle axial flow type structure, the efficiency of the structure inducer is lower, and the two are main reasons for ensuring the cavitation performance and sacrificing the efficiency.
The inducer is widely applied to the field of aviation, the high altitude performance of an airplane is an important performance index of the inducer, the solution of the high altitude cavitation performance of the centrifugal pump is an important way for solving the high altitude performance, and the cavitation performance and the efficiency of the current aviation fuel pump in the high altitude state are important factors for restricting the further development of the aviation technology. High cavitation performance and high efficiency are the development direction of related industrial pump products in the future.
The inducer is arranged in front of the centrifugal pump impeller, and the following problems are caused:
1) the inlet attack angle of the impeller is increased, and the impact loss at the inlet is increased further, so that the efficiency of the centrifugal pump is reduced;
2) the obvious cavitation phenomenon occurs in the inducer, the internal flow field structure is complex and disordered, the efficiency is low and difficult to estimate, in addition, the number of the inducer blades is small, the capability of controlling the fluid motion direction is limited, so that the liquid flow angle of the inducer outlet deviates from the setting angle of the inducer outlet, and the velocity triangle of the inducer outlet has larger deviation than the theoretical design value, so that the velocity triangle of the inducer outlet (the centrifugal pump impeller inlet) is difficult to accurately calculate from the theoretical design.
The increase in impact loss at the impeller inlet of a centrifugal pump not only reduces pump efficiency, but also affects the cavitation performance of the pump. At present, in the industry, under the condition that a centrifugal pump impeller exists and cannot meet the cavitation requirement, a preposed inducer is selected to be additionally arranged, and the cooperation and matching design between the inducer and the impeller is lacked. The inducer and the main pump impeller are reasonably and cooperatively designed, so that the pump efficiency can be improved, the cavitation performance of the pump can be properly improved, and the method has great significance for developing high-cavitation-performance and high-efficiency pumps. However, as can be seen from the above point 2), due to the complexity of the internal flow of the inducer, it is theoretically difficult to predict the inducer outlet flow field structure, so it is difficult to accurately realize the cooperative design of the inducer and the impeller from the theoretical design alone.
The numerical simulation technology is widely applied to the industrial field along with the development of computer science, and in view of the fact that the theoretical design cannot accurately obtain the velocity triangle of the inducer outlet, a numerical simulation method can be adopted to obtain the flow field structure of the inducer outlet, and then the setting condition of the impeller inlet is determined based on the flow field structure, so that the collaborative design of the inducer and the impeller is realized.
The method for determining the placement angle of the inlet of the centrifugal pump impeller provided by the embodiment of the invention takes the flow as 360m3The inducer design with the rotating speed of 2950RPM and the necessary cavitation allowance of less than or equal to 3.2m is adopted, the diameter of an impeller inlet is 176mm, and the diameter of a hub is 65 mm.
Fig. 2 is a flowchart of a method for determining a placement angle of an inlet of a centrifugal pump impeller according to an embodiment of the present invention.
Referring to fig. 2, the method for determining the placement angle of the centrifugal pump impeller inlet provided by the embodiment includes:
step 101: and constructing an inducer grid model.
The step 101 specifically includes:
constructing a three-dimensional model of the variable-pitch inducer; carrying out three-dimensional geometric modeling on an inducer fluid domain of the variable-pitch inducer three-dimensional model to obtain a fluid domain geometric model; and carrying out meshing on the fluid domain geometric model to obtain the inducer mesh model.
In practical application, the construction process of the inducer grid model is as follows: designing an inducer by adopting a traditional variable pitch inducer design method to obtain a three-dimensional model of the variable pitch inducer, as shown in FIG. 3; then, carrying out three-dimensional geometric modeling on an inducer fluid domain of the variable-pitch inducer three-dimensional model to obtain a fluid domain geometric model, as shown in FIG. 4; carrying out tetrahedral mesh division on the fluid domain geometric model by using ICEM software to obtain an inducer mesh model, as shown in FIG. 5; and setting boundary conditions, and carrying out cavitation numerical simulation calculation on the inducer calculation domain by adopting an RNG k-epsilon turbulence model, wherein the specific setting of the boundary conditions is shown in table 1.
TABLE 1 boundary condition settings
Step 102: determining at least three circular lines on an exit face of the inducer grid model. Specifically, at least three circle lines with different radiuses are taken at the inducer outlet position of the inducer grid model by taking a point on the pump axis as a circle center.
In this embodiment, three circular lines are taken as an example, and as shown in fig. 6, a first circular line a, a second circular line b, and a third circular line c are determined on the exit surface of the inducer mesh model; the first round line a is a streamline which is positioned on an outlet face of the inducer grid model and is a first set distance away from the hub; the second round line b is a streamline located in the middle of an outlet face of the inducer grid model; and the third round line c is a streamline which is positioned on the exit surface of the inducer grid model and is a second set distance away from the wheel rim.
The radius of the first round line a is raThe radius of the second round line b is rbThe radius of the third circle line c is rc，ra＝0.9(r2-rh)+rh；rb＝0.5(r2-rh)+rh；rc＝0.1(r2-rh)+rh. Wherein r is2The radius of the outer edge of the outlet of the inducer is 88mm, and the radius of the inlet of the centrifugal pump impeller is taken; r ishIn order to induce the radius of the hub at the outlet of the wheel, the radius of the hub at the inlet of the centrifugal pump impeller is 32.5 mm.
Step 103: and calculating the inducer outlet liquid flow angle of the circular line by adopting a flow field calculation method.
The step 103 specifically includes:
1) selecting a set number of points on the circular line; calculating the circumferential component velocity and the axial velocity of each point by adopting a flow field calculation method based on the boundary condition; and calculating the outlet liquid flow angle of the corresponding point according to the circumferential direction component velocity and the axial velocity.
Specifically, 200 points are selected on a first circular line a, a second circular line b and a third circular line c respectively, and the circumferential direction component velocity of the ith point position is read through the flow field calculation result
And axial velocity
And calculating the outlet flow angle of the ith point
Wherein:
u2the angular distribution of the outlet flow angles of the three circular lines in order to induce the peripheral speed at the corresponding position of the wheel outlet is shown in fig. 7.
As can be seen from fig. 7, since the vanes of the inducer are limited, the fluid cannot flow in the direction of the blade bone line, so that the fluid flow angle has a certain deviation from the setting angle of the outlet of the inducer, and the cavitation phenomenon in the inducer makes the internal flow field structure of the inducer complicated and difficult to predict, so that the deviation between the fluid flow angle of the outlet and the setting angle of the outlet is larger, and the positions of the rim and the middle flow line are more likely to be found
Basically takes 360/z (z is the number of blades) as a period distribution, and the flow field at the hub position has disordered structure and unsteady characteristicsParticularly obvious.
2) And calculating the average value of the outlet liquid flow angles of all the points on the circular line to obtain the outlet liquid flow angle of the inducer. In this embodiment, the average of the outlet fluid flow angles of all the points on the three circular lines is obtained, that is, the inducer outlet fluid flow angle corresponding to the first circular line, the inducer outlet fluid flow angle corresponding to the second circular line, and the inducer outlet fluid flow angle corresponding to the third circular line are obtained.
Specifically, all the cylindrical surfaces on which different circular lines are positioned are respectively aligned
Weighted average calculation is performed on the corresponding circumference, and since 200 points on each circle are uniformly sampled, the positions of the points are calculated
Summing and dividing by 200 to obtain the average value of the outlet liquid flow angles of all the points on each circular line, wherein the calculation formula is as follows:
The mean value of the outlet liquid flow angles of all the points on the first circular line, namely the calculation formula of the inducer outlet liquid flow angle corresponding to the first circular line, is as follows:
(theoretical design value 18.7 °).
The average value of the outlet liquid flow angles of all the points on the second circular line, namely the calculation formula of the outlet liquid flow angle of the inducer corresponding to the second circular line is
(theoretical design value 22.4 °).
The average value of the outlet liquid flow angles of all the points on the third circular line, namely the calculation formula of the outlet liquid flow angle of the inducer corresponding to the third circular line is
(theoretical design value 37.1 ℃ C.).
Step 104: and calculating the placement angle of the inlet of the centrifugal pump impeller based on the inducer outlet liquid flow angle. Specifically, the centrifugal pump impeller inlet placement angle is calculated according to the inducer outlet liquid flow angle and the attack angle.
In practical application, the specific calculation process is as follows:
determining the impeller at ra、rbAnd rcRadial centrifugal pump impeller inlet setting angle beta3a、β3bAnd beta3cWherein, in the step (A),
β3a＝β3a′+α；
β3b＝β3b′+α；
β3c＝β3c+α；
β3a′、β3b' and beta3c' centrifugal pump impeller inlet radius is ra、rbAnd rcThe position corresponds to a liquid flow angle, alpha is an attack angle, alpha is selected according to experience and ranges from (3 degrees to 12 degrees), and the liquid flow angle at the inlet of the centrifugal pump impeller is equal to the liquid flow angle at the outlet of the inducer, namely:
further, it is found that:
β3a、β3band beta3cRespectively, the radius of the inlet of the centrifugal pump impeller is ra、rbAnd rcThe inlet of the centrifugal pump impeller at the position is arranged at an angle.
And determining the inlet mounting angle of the corresponding position of the centrifugal pump inlet according to the calculation result, thereby realizing the cooperative matching design of the inducer and the centrifugal pump.
The method for determining the placement angle of the impeller inlet of the centrifugal pump solves the technical problems that in the prior art, due to the fact that the inducer resets the flow field structure, the angle of attack of the inlet of the centrifugal pump is increased, efficiency is reduced, and due to the fact that the liquid flow angle of the outlet of the inducer cannot be accurately determined by a traditional design method, the efficiency of a unit cannot be effectively improved due to the fact that the speed triangle of the inlet of the centrifugal pump cannot be accurately determined.
The invention also provides a system for determining the placement angle of the inlet of the centrifugal pump impeller, and fig. 8 is a structural diagram of the system for determining the placement angle of the inlet of the centrifugal pump impeller provided by the embodiment of the invention.
Referring to fig. 8, the centrifugal pump impeller inlet placement angle determination system of the present embodiment includes:
the model building module 201 is configured to build an inducer grid model.
A circle line determining module 202, configured to determine at least three circle lines on an exit face of the inducer mesh model.
And the liquid flow angle calculating module 203 is configured to calculate an inducer outlet liquid flow angle of the circular line by using a flow field calculating method.
And a placement angle calculation module 204, configured to calculate a centrifugal pump impeller inlet placement angle based on the inducer outlet liquid flow angle.
As an optional implementation manner, the model building module 201 specifically includes:
the first construction unit is used for constructing a three-dimensional model of the variable pitch inducer.
And the second construction unit is used for carrying out three-dimensional geometric modeling on the inducer fluid domain of the variable pitch inducer three-dimensional model to obtain a fluid domain geometric model.
And the dividing unit is used for carrying out grid division on the fluid domain geometric model to obtain the inducer grid model.
As an optional implementation manner, the circle line determining module 202 specifically includes:
a circle line determination unit configured to determine a first circle line, a second circle line, and a third circle line on an exit surface of the inducer mesh model; the first round line is a streamline which is located on an outlet face of the inducer grid model and is a first set distance away from the hub; the second round line is a streamline located in the middle of an outlet face of the inducer grid model; and the third round line is a streamline which is positioned on the exit surface of the inducer grid model and is a second set distance away from the wheel rim.
As an optional implementation manner, the liquid flow angle calculation module 203 specifically includes:
and a boundary condition setting unit for setting a boundary condition.
And the selecting unit is used for selecting a set number of points on the circular line.
And the first calculating unit is used for calculating the circumferential component velocity and the axial velocity of each point by adopting a flow field calculating method based on the boundary condition.
And the second calculation unit is used for calculating the outlet liquid flow angle of the corresponding point according to the circumferential direction component velocity and the axial velocity.
And the third calculating unit is used for calculating the average value of the outlet liquid flow angles of all the points on the circular line to obtain the outlet liquid flow angle of the inducer.
As an optional implementation manner, the placement angle calculating module 204 specifically includes:
and the mounting angle calculation unit is used for calculating the mounting angle of the centrifugal pump impeller inlet according to the inducer outlet liquid flow angle and the attack angle.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept 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 (10)
1. A method for determining the placement angle of an inlet of a centrifugal pump impeller is characterized by comprising the following steps:
constructing an inducer grid model;
determining at least three circular lines on an exit face of the inducer grid model;
calculating an inducer outlet liquid flow angle of the circular line by adopting a flow field calculation method;
and calculating the placement angle of the inlet of the centrifugal pump impeller based on the inducer outlet liquid flow angle.
2. The method for determining the placement angle of the centrifugal pump impeller inlet according to claim 1, wherein the constructing of the inducer grid model specifically includes:
constructing a three-dimensional model of the variable-pitch inducer;
carrying out three-dimensional geometric modeling on an inducer fluid domain of the variable-pitch inducer three-dimensional model to obtain a fluid domain geometric model;
and carrying out meshing on the fluid domain geometric model to obtain the inducer mesh model.
3. The method for determining the placement angle of the inlet of the centrifugal pump impeller according to claim 1, wherein the determining at least three circular lines on the outlet face of the inducer grid model specifically comprises:
determining a first circular line, a second circular line and a third circular line on an exit face of the inducer mesh model; the first round line is a streamline which is located on an outlet face of the inducer grid model and is a first set distance away from the hub; the second round line is a streamline located in the middle of an outlet face of the inducer grid model; and the third round line is a streamline which is positioned on the exit surface of the inducer grid model and is a second set distance away from the wheel rim.
4. The method for determining the placement angle of the centrifugal pump impeller inlet according to claim 1, wherein the calculating of the inducer outlet fluid flow angle of the circular line by using a flow field calculation method specifically includes:
setting a boundary condition;
selecting a set number of points on the circular line;
calculating the circumferential component velocity and the axial velocity of each point by adopting a flow field calculation method based on the boundary condition;
calculating an outlet flow angle of a corresponding point according to the circumferential direction component velocity and the axial velocity;
and calculating the average value of the outlet liquid flow angles of all the points on the circular line to obtain the outlet liquid flow angle of the inducer.
5. The method for determining the placement angle of the inlet of the centrifugal pump impeller according to claim 1, wherein the calculating the placement angle of the inlet of the centrifugal pump impeller based on the inducer outlet flow angle specifically comprises:
and calculating the setting angle of the inlet of the centrifugal pump impeller according to the liquid flow angle and the attack angle of the outlet of the inducer.
6. A centrifugal pump impeller inlet placement angle determination system, comprising:
the model construction module is used for constructing an inducer grid model;
a circle line determination module for determining at least three circle lines on an exit face of the inducer grid model;
the liquid flow angle calculation module is used for calculating the inducer outlet liquid flow angle of the circular line by adopting a flow field calculation method;
and the mounting angle calculation module is used for calculating a mounting angle of an inlet of the centrifugal pump impeller based on the inducer outlet liquid flow angle.
7. The centrifugal pump impeller inlet placement angle determination system of claim 6, wherein the model building module specifically comprises:
the first construction unit is used for constructing a three-dimensional model of the variable-pitch inducer;
the second construction unit is used for carrying out three-dimensional geometric modeling on an inducer fluid domain of the variable-pitch inducer three-dimensional model to obtain a fluid domain geometric model;
and the dividing unit is used for carrying out grid division on the fluid domain geometric model to obtain the inducer grid model.
8. The centrifugal pump impeller inlet placement angle determination system of claim 6, wherein the circle line determination module specifically comprises:
a circle line determination unit configured to determine a first circle line, a second circle line, and a third circle line on an exit surface of the inducer mesh model; the first round line is a streamline which is located on an outlet face of the inducer grid model and is a first set distance away from the hub; the second round line is a streamline located in the middle of an outlet face of the inducer grid model; and the third round line is a streamline which is positioned on the exit surface of the inducer grid model and is a second set distance away from the wheel rim.
9. The system for determining the placement angle of the inlet of the centrifugal pump impeller according to claim 6, wherein the fluid flow angle calculation module specifically comprises:
a boundary condition setting unit for setting a boundary condition;
a selecting unit for selecting a set number of points on the circular line;
the first calculating unit is used for calculating the circumferential component velocity and the axial velocity of each point by adopting a flow field calculating method based on the boundary condition;
the second calculation unit is used for calculating an outlet liquid flow angle of the corresponding point according to the circumferential direction component velocity and the axial velocity;
and the third calculating unit is used for calculating the average value of the outlet liquid flow angles of all the points on the circular line to obtain the outlet liquid flow angle of the inducer.
10. The centrifugal pump impeller inlet placement angle determination system of claim 6, wherein the placement angle calculation module specifically comprises:
and the mounting angle calculation unit is used for calculating the mounting angle of the centrifugal pump impeller inlet according to the inducer outlet liquid flow angle and the attack angle.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100021308A (en) * | 2008-08-14 | 2010-02-24 | 한국생산기술연구원 | Method and system for designing impeller of centrifugal and mixed flow pump |
| CN102705263A (en) * | 2012-06-21 | 2012-10-03 | 江苏大学 | Optimal design method for inducer with varying pitch of centrifugal pump |
| CN104047890A (en) * | 2014-07-25 | 2014-09-17 | 江苏大学 | Design method of axial flow type low-lift prepositioned inducer |
| CN109684664A (en) * | 2018-11-21 | 2019-04-26 | 中国电力科学研究院有限公司 | A kind of fining Meshing Method and system for conducting wire flow field simulation |
| CN112901502A (en) * | 2021-03-16 | 2021-06-04 | 兰州理工大学 | Method for setting mounting angle of inlet of spatial guide vane of axial flow pump |
-
2021
- 2021-06-17 CN CN202110671534.7A patent/CN113239497B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100021308A (en) * | 2008-08-14 | 2010-02-24 | 한국생산기술연구원 | Method and system for designing impeller of centrifugal and mixed flow pump |
| CN102705263A (en) * | 2012-06-21 | 2012-10-03 | 江苏大学 | Optimal design method for inducer with varying pitch of centrifugal pump |
| CN104047890A (en) * | 2014-07-25 | 2014-09-17 | 江苏大学 | Design method of axial flow type low-lift prepositioned inducer |
| CN109684664A (en) * | 2018-11-21 | 2019-04-26 | 中国电力科学研究院有限公司 | A kind of fining Meshing Method and system for conducting wire flow field simulation |
| CN112901502A (en) * | 2021-03-16 | 2021-06-04 | 兰州理工大学 | Method for setting mounting angle of inlet of spatial guide vane of axial flow pump |
Non-Patent Citations (1)
| Title |
|---|
| 田威;李小宁;: "单喷嘴冲击式气动旋转驱动器的三维流场数值模拟", 液压与气动, no. 03 * |
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