CN-119989579-B - Design method of integrated impeller of high-speed centrifugal pump

CN119989579BCN 119989579 BCN119989579 BCN 119989579BCN-119989579-B

Abstract

The invention provides a design method of an integrated impeller of a high-speed centrifugal pump, which belongs to the technical field of design of impellers of centrifugal pumps, and comprises the steps of designing the integrated impeller according to working conditions of the high-speed centrifugal pump; the method comprises the steps of utilizing a grid generating tool to conduct grid division on a designed integrated impeller, conducting grid independence test to obtain an integrated impeller grid, conducting numerical simulation according to the integrated impeller grid to obtain simulation steady data and cavitation data of the integrated impeller, judging whether the integrated impeller meets working condition or not according to the simulation steady data and the cavitation data of the integrated impeller, optimizing the integrated impeller by utilizing a numerical control programming tool based on a gray wolf algorithm if the integrated impeller meets the working condition, conducting grid division again and judging the working condition, and outputting the integrated impeller if the integrated impeller meets the working condition, so that the design of the integrated impeller of the high-speed centrifugal pump is completed. The invention improves the anti-cavitation capacity of the high-speed centrifugal pump and the lift of the high-speed centrifugal pump, and keeps the high-speed centrifugal pump running safely and stably.

Inventors

XIAO RUOFU
FANG XINGYU
ZHU DI
TAO RAN

Assignees

中国农业大学

Dates

Publication Date: 20260512
Application Date: 20250313

Claims (8)

1. The design method of the integrated impeller of the high-speed centrifugal pump is characterized by comprising the following steps of: s1, carrying out preliminary design on the integrated impeller according to the working condition of the high-speed centrifugal pump, wherein the specific steps are as follows: S101, designing long blades of an integrated impeller according to working conditions of a high-speed centrifugal pump, and designing inlet flow coefficients, tip diameters, inlet liquid flow attack angles, inlet long blade installation angles, outlet width of long blades, number of long blades, wrap angles of tip of the long blades and thickness of the long blades of the integrated impeller, wherein the method comprises the following specific steps of: S1011, according to the working condition of the high-speed centrifugal pump, obtaining the inlet flow coefficient of the long blade by using a cavitation coefficient calculation formula, and obtaining the tip diameter of the long blade according to the inlet flow coefficient of the long blade; S1012, designing an inlet liquid flow attack angle, an inlet long blade installation angle, an outlet long blade installation angle and a long blade outlet width of the long blade by adopting a variable pitch design method according to an inlet flow coefficient of the long blade; S1013, designing an integrated impeller into a conical impeller, setting a long-blade inlet hub ratio and a conical angle, and selecting the number of long blades of the integrated impeller based on the long-blade inlet hub ratio and the conical angle to obtain She Shan consistencies; s1014, calculating pitch according to the number of the long blades and the diameter of the tips of the long blades, and calculating the outer diameter of the inlet front edge of the long blade according to the inlet hub ratio of the long blade and the diameter of the tips of the long blades; S1015, defining a long blade front edge wrap angle, determining a long blade total wrap angle by combining She Shan consistencies and pitches through an integral impeller blade unfolding length and axial length calculation formula, and calculating to obtain a long blade tip wrap angle; S1016, setting a first thickness of the front edge of the long blade, setting a second thickness at a position of 30% -40% of the chord length of the blade, and obtaining the thickness of the long blade according to the first thickness and the second thickness of the long blade to finish the initial design of the long blade of the integrated impeller; S102, designing a short blade of the integrated impeller according to the working condition of the high-speed centrifugal pump, and designing an inlet liquid flow attack angle, an inlet mounting angle, an outlet width and a thickness of the short blade to complete the design of the short blade of the integrated impeller; S103, combining the long-blade design of the integrated impeller and the short-blade design of the integrated impeller to obtain an integrated impeller of a preliminary design; S2, utilizing a grid generating tool to carry out grid division on the designed integrated impeller, and carrying out grid independence test to obtain an integrated impeller grid; s3, carrying out numerical simulation by using a hydrodynamic calculation tool according to the integrated impeller grid to obtain simulation steady data and cavitation data of the integrated impeller; S4, judging whether the working condition is met according to the simulation steady data and cavitation data of the integrated impeller, if not, optimizing the integrated impeller by utilizing a numerical control programming tool based on a gray wolf algorithm, returning to the step S2, and if so, outputting the integrated impeller to finish the design of the integrated impeller of the high-speed centrifugal pump.
2. The method for designing an integrated impeller of a high-speed centrifugal pump according to claim 1, wherein the cavitation coefficient of the long vane is calculated as follows: Wherein, the Indicating the cavitation coefficient of the long blade, Representing the inlet flow coefficient of a long vane, Indicating the mounting angle of the inlet long blade, Representing the inlet flow angle of the long blade; The calculation formula of the outlet width of the long blade is as follows: Wherein, the Indicating the width of the outlet of the long blade, The specific rotation speed of the integrated impeller is shown, Represents the lift of the integrated impeller, Indicating the rotational speed of the integrated impeller, Indicating the outer diameter of the leading edge of the inlet of the long blade, Representing the inlet hub ratio of the long blade, Indicating the tip diameter of a long blade.
3. The method for designing an integrated impeller of a high-speed centrifugal pump according to claim 2, wherein the calculation formula of the total wrap angle of the long blades is as follows: , Wherein, the The wrap angle of the tip of the long blade is shown, The total wrap angle of the long blade is shown, Indicating the wrap angle of the leading edge of the long blade, The consistency of She Shan is indicated as such, The pitch is indicated as such, Indicating the length of the extended long blade, Indicating the tip diameter of a long blade, Indicating the number of long blades and, The representation is made of a combination of a first and a second color, Indicating the mounting angle of the inlet long blade, Indicating the mounting angle of the long blade of the outlet, Representing the axial length.
4. The method for designing an integrated impeller of a high-speed centrifugal pump according to claim 1, wherein the integrated impeller long-blade design is specifically: the inlet flow coefficient of the long blade is 0.05-0.1, the diameter of the tip of the long blade is 40 mm-72 mm, the attack angle of the inlet liquid flow of the long blade is The installation angle of the long outlet blade is The inlet hub ratio of the long blade is 0.13-0.3, and the taper angle is The number of the long blades is selected to be 2 or 3, and the wrap angle of the front edge of the long blade is The first thickness of the front edge of the long blade is 0.3 mm-0.5 mm, and the second thickness of the front edge of the long blade is 1.5 mm-2.5 mm at the position of 30% -40% of the chord length of the blade; the design of the integrated impeller short blade is specifically as follows: Inlet flow angle of short blade is The inlet mounting angle of the short blade is The installation angle of the outlet of the short blade is The thickness of the short blade is 1.5 mm-2.5 mm; the short blade outlet width calculation formula is as follows: Wherein, the Representing the width of the short vane outlet, The specific rotation speed of the integrated impeller is shown, Represents the lift of the integrated impeller, Indicating the rotational speed of the integrated impeller.
5. The method for designing an integrated impeller of a high-speed centrifugal pump according to claim 1, wherein S3 specifically comprises: And (3) introducing the integrated impeller grid into a hydrodynamic computing tool, and setting boundary conditions of an inlet and an outlet of the high-speed centrifugal pump by using the hydrodynamic computing tool according to working condition of the high-speed centrifugal pump to perform numerical simulation to obtain simulation steady data and cavitation data of the integrated impeller.
6. The method for designing an integrated impeller of a high-speed centrifugal pump according to claim 1, wherein in S4, the specific steps of optimizing the integrated impeller by using a numerical control programming tool are as follows: editing by using a numerical control programming tool to obtain a plurality of tool bodies, forming a tool body group, prioritizing and marking the tool body group to obtain a preprocessed tool body group; Taking the integrated impeller as a target body, surrounding the target body by utilizing each preprocessed tool body according to the preprocessed tool body group, performing iterative optimization to obtain a position vector of each tool body and a position vector of the target body, and calculating to obtain the distance between the position of each tool body and the position of the target body; In each iteration process, reserving three optimal tool bodies in the current tool body group as optimal tool bodies, and carrying out position update on the tool bodies except the optimal tool bodies to obtain the position information of the current candidate tool bodies; And responding to the maximum iteration times, obtaining an optimal target body according to the position information of the current candidate tool body, outputting an optimal integrated impeller, and completing optimization of the integrated impeller.
7. The method for designing an integrated impeller for a high-speed centrifugal pump according to claim 6, wherein the mathematical model expression for iterative optimization is as follows: , Wherein, the Representing the number of current iterations and, Represent the first The position vector of the tool body is iterated a number of times, Represent the first The position vector of the target volume is iterated a number of times, Represent the first The position vector of the tool body is iterated a number of times, The product of the Hadamard is represented, And Each representing a vector of co-coefficients, Representing the distance between the tool body position and the target body position, Represents the convergence factor, linearly decreasing from 2 to 0, And Representation of Is a random vector in (a).
8. The method for designing an integrated impeller for a high-speed centrifugal pump according to claim 6, wherein the mathematical model expression for updating the position of the tool body is as follows: , , , , Wherein, the Represent the first The position vector of the tool body is iterated a number of times, A position vector representing the object 1, A position vector representing the object 2, A position vector representing the object 3 is shown, Representing a first optimal tool body Is used for the position vector of (a), Representing a first optimal tool body The distance from the candidate tool body, Representing a second optimal tool body Is used for the position vector of (a), Representing a second optimal tool body The distance from the candidate tool body, Representing a third optimal tool body Is used for the position vector of (a), Representing a third optimal tool body The distance from the candidate tool body, 、、 And 、、 Each representing a vector of co-coefficients, Representing the position vector of the candidate tool body.

Description

Design method of integrated impeller of high-speed centrifugal pump Technical Field The invention belongs to the technical field of centrifugal pump impeller design, and particularly relates to a design method of an integrated impeller of a high-speed centrifugal pump. Background The integrated impeller is a structural design combining the inducer and the centrifugal impeller, and has remarkable advantages in terms of improving the performance and efficiency of the pump, firstly, the design of the integrated impeller can improve the inlet pressure of the impeller and ensure higher cavitation resistance, because the inducer blade acts, fluid is pre-pressurized before entering the centrifugal impeller, the cavitation resistance of the whole pump is improved, in addition, the problem of connection and matching between traditional split impellers is avoided, the energy loss is reduced, the efficiency of the impeller is improved to a great extent, secondly, the structure of the integrated impeller is more compact, the overall size of the pump can be reduced, and therefore, the space and material cost are saved, and meanwhile, the design also helps to reduce the manufacturing and maintenance cost of the pump due to the reduction of the number of parts. There is a close relationship between cavitation and impeller profile. The design of the impeller molded lines directly influences the flowing state of fluid in the impeller so as to influence the occurrence and development of cavitation, the design of the impeller molded lines determines the flowing path and speed distribution of the fluid in the impeller, the reasonable molded line design can enable the fluid to flow in the impeller more smoothly, the occurrence of flow separation and vortex phenomena is reduced, and geometric parameters of the impeller molded lines, such as the shape, the angle, the number and the like of blades, can influence the cavitation characteristics. For example, the back-rake angle of the blade is one of the important parameters affecting cavitation performance, and research shows that increasing the back-rake angle of the blade within a certain range can improve the cavitation performance of the high-speed centrifugal pump, because the increase of the back-rake angle can change the flow state at the inlet of the blade, so that the attack angle of fluid entering the impeller is more reasonable, and the cavitation phenomenon is reduced, however, when the back-rake angle exceeds a certain range, the cavitation performance is reduced, and the design of the impeller profile also affects the distribution and development of the cavitation phenomenon. The integrated impeller is excellent in fluid dynamics performance, the complex molded line design can realize multistage pressurization of the fluid and stable flow passage, and the design can effectively reduce the flow loss of the fluid in the impeller and further improve the performance of the pump. However, the impeller of the high-speed centrifugal pump in the prior art has the problems of low anti-cavitation capacity and low lift of the high-speed centrifugal pump, so that the design of a proper integrated impeller design method is significant for the anti-cavitation stable operation of the high-speed centrifugal pump. Disclosure of Invention Aiming at the defects in the prior art, the invention provides the design method of the integrated impeller of the high-speed centrifugal pump, which solves the problems of low cavitation resistance and low lift of the existing high-speed centrifugal pump. In order to achieve the purpose, the technical scheme adopted by the invention is that the design method of the integrated impeller of the high-speed centrifugal pump comprises the following steps: s1, primarily designing an integrated impeller according to the working condition of a high-speed centrifugal pump; S2, utilizing a grid generating tool to carry out grid division on the designed integrated impeller, and carrying out grid independence test to obtain an integrated impeller grid; s3, carrying out numerical simulation by using a hydrodynamic calculation tool according to the integrated impeller grid to obtain simulation steady data and cavitation data of the integrated impeller; S4, judging whether the working condition is met according to the simulation steady data and cavitation data of the integrated impeller, if not, optimizing the integrated impeller by utilizing a numerical control programming tool based on a gray wolf algorithm, returning to the step S2, and if so, outputting the integrated impeller to finish the design of the integrated impeller of the high-speed centrifugal pump. The method has the beneficial effects that through the initial design of the universal integrated impeller, the numerical simulation of the integrated impeller which is initially designed, the better external characteristics and anti-cavitation characteristics are realized, the blade molded lines and long a