High-efficiency low-pressure pulsating axial flow pump blade design method and device, and electronic equipment

Abstract

The application discloses a high-efficiency low-pressure pulsation axial flow pump blade design method and device and electronic equipment, improves a traditional axial flow pump blade surface, and comprises the following steps: determining structural design parameters according to external characteristic requirements; establishing a three-dimensional model according to the structural design parameters and performing simulation calculation; considering the influence of an impeller structure on pump performance, setting a plurality of groups of blade concave-convex surfaces based on a cylindrical laminar flow independence assumption and multi-curvature control, and optimizing key geometric parameters of the blade concave-convex surfaces; and performing optimal selection on simulation calculation results of the plurality of groups of blade concave-convex surfaces to obtain high-efficiency low-pressure pulsation axial flow pump blade design geometric parameters. The uneven structure has a flow guiding effect on fluid on the blade surface, makes a blade surface flow separation point be delayed, and makes streamline distribution be more uniform, so that the lift is improved while various performance requirements are ensured, especially in a saddle area of the axial flow pump.

Description

Technical Field

[0001] This application relates to the field of axial flow pump blade design technology, and in particular to a high-efficiency, low-pressure pulsating axial flow pump blade design method and device, and electronic equipment. Background Technology

[0002] Axial flow pumps, as the most common type of hydraulic machinery, are characterized by low head and large flow rate. They are widely used in industries such as farmland irrigation, urban sewage drainage systems, and water transfer in water network hubs. The demand for high-performance axial flow pumps continues to increase.

[0003] As the core component of an axial flow pump, the impeller has a significant impact on the internal flow of the pump. Traditional impeller design generally involves many design parameters and a complex design process, using methods such as lift method, conformal transformation method, and singularity distribution method. Summary of the Invention

[0004] The purpose of this application is to provide a high-efficiency, low-pressure pulsating axial flow pump blade design method, device, and electronic equipment to solve the technical problem of complex design process in related technologies, thereby improving head, reducing internal flow loss and pressure pulsation.

[0005] According to a first aspect of the embodiments of this application, a method for designing blades for a high-efficiency, low-pressure pulsating axial flow pump is provided, comprising:

[0006] The structural design parameters of the axial flow pump are determined according to the predetermined external characteristic requirements, which include head, efficiency, flow rate, and outlet pressure. The structural design parameters include impeller hub ratio, number of blades, angle of attack, blade density, and inlet and outlet diameters of the axial flow pump.

[0007] Based on the structural design parameters, a three-dimensional solid domain model of the axial flow pump is established, and a fluid domain is extracted based on the three-dimensional solid domain model of the axial flow pump. Numerical simulation calculations are performed on the fluid domain, including external characteristic calculations, internal flow calculations, and pressure pulsation calculations for the axial flow pump under all operating conditions.

[0008] The results of the numerical simulation calculations were analyzed. Considering that the impeller structure plays an important role in the performance of the axial flow pump, the key geometric parameters of the concave and convex surfaces of the axial flow pump blades were optimized based on the assumption of laminar flow independence of the cylinder and multi-curvature control. Several sets of blade concave and convex surfaces were set. The key geometric parameters are the arrangement position, length, width, protrusion height and protrusion radius of the blade concave and convex surfaces.

[0009] Numerical simulation calculations were performed on several sets of axial flow pumps with concave and convex blade surfaces. Based on the comprehensive performance obtained from the numerical simulation calculations of the axial flow pumps and the optimal selection of key geometric parameters of the concave and convex blade surfaces, the design geometric parameters of the high-efficiency low-pressure pulsating axial flow pump blades based on multi-curvature control of the blade surface were obtained. The comprehensive performance includes external characteristics, internal flow performance, and pressure pulsation performance.

[0010] Optionally, based on the structural design parameters, a three-dimensional model of the solid domain of the axial flow pump is established, and a fluid domain is extracted based on the three-dimensional model of the solid domain of the axial flow pump. Numerical simulation calculations are then performed on the fluid domain, including the following sub-steps:

[0011] Based on the determined structural design parameters, a solid domain three-dimensional model is established. The fluid domain three-dimensional model is extracted from the solid domain three-dimensional model of the axial flow pump, and then the fluid domain three-dimensional model is meshed.

[0012] After mesh generation, numerical simulation is performed on the three-dimensional model of the fluid domain. In the calculation of external characteristics and internal flow, the rotational speed, flow velocity and inlet pressure conditions are set according to the full operating conditions of the axial flow pump. In the calculation of pressure pulsation, monitoring points are set on the three-dimensional model of the fluid domain to monitor pressure pulsation.

[0013] The streamlines, turbulent kinetic energy distribution, and vortex structure distribution of the axial flow pump are analyzed, and the external characteristics and pressure pulsation of different blade surfaces are compared.

[0014] Optionally, numerical simulation calculations are performed on several sets of axial flow pumps with uneven blade surfaces. Based on the comprehensive performance obtained from the numerical simulation calculations of the axial flow pumps and the optimal selection of key geometric parameters of the uneven blade surfaces, including:

[0015] Numerical simulation calculations were performed on several groups of axial flow pumps with concave and convex blade surfaces. The head, efficiency, streamline, turbulent kinetic energy and vortex structure correlation parameters obtained from the numerical simulation calculations of axial flow pumps with different concave and convex blade surfaces were compared using a comparative analysis method. Based on this, the optimal selection of comprehensive performance and key geometric parameters of the concave and convex blade surfaces was determined. The comprehensive performance includes external characteristics, internal flow performance and pressure pulsation performance.

[0016] According to a second aspect of the embodiments of this application, a high-efficiency, low-pressure pulsating axial flow pump blade design device is provided, comprising:

[0017] The parameter determination module is used to determine the structural design parameters of the axial flow pump according to predetermined external characteristic requirements. The external characteristic requirements include head, efficiency, flow rate, and outlet pressure. The structural design parameters include impeller hub ratio, number of blades, angle of attack, blade density, and inlet and outlet diameters of the axial flow pump.

[0018] The modeling and simulation module is used to establish a three-dimensional solid domain model of the axial flow pump based on the structural design parameters, and to extract the fluid domain based on the three-dimensional solid domain model of the axial flow pump, and to perform numerical simulation calculations on the fluid domain. The numerical simulation calculations include external characteristic calculations, internal flow calculations, and pressure pulsation calculations for the axial flow pump under all operating conditions.

[0019] The simulation result analysis module is used to analyze the results of the numerical simulation calculation. Considering that the impeller structure plays an important role in the performance of the axial flow pump, the key geometric parameters of the concave and convex surfaces of the axial flow pump blades are optimized based on the assumption of laminar flow independence of the cylinder and multi-curvature control. Several sets of blade concave and convex surfaces are set. The key geometric parameters are the arrangement position, length, width, protrusion height and protrusion radius of the blade concave and convex surfaces.

[0020] The simulation optimization module is used to perform numerical simulation calculations on axial flow pumps with several sets of blade concave and convex surfaces. Based on the comprehensive performance obtained from the numerical simulation calculation of the axial flow pump and the optimal selection of key geometric parameters of the blade concave and convex surfaces, the design geometric parameters of the high-efficiency low-pressure pulsating axial flow pump blade based on multi-curvature control of the blade surface are obtained. The comprehensive performance includes external characteristics, internal flow performance, and pressure pulsation performance.

[0021] According to a second aspect of the embodiments of this application, an electronic device is provided, comprising:

[0022] One or more processors;

[0023] Memory, used to store one or more programs;

[0024] When the one or more programs are executed by the one or more processors, the one or more processors perform the method as described in the first aspect.

[0025] According to a second aspect of the embodiments of this application, a computer-readable storage medium is provided, having stored thereon computer instructions that, when executed by a processor, implement the steps of the method as described in the first aspect.

[0026] The technical solutions provided by the embodiments of this application may include the following beneficial effects:

[0027] As can be seen from the above embodiments, this application, from the perspective of axial flow pump optimization design, adopts a novel design method for axial flow pump blades to control the efficiency and pressure pulsation of axial flow pumps. This invention employs an uneven surface arrangement on the impeller, and through simulation calculations and experimental verification, obtains the optimal selection of the comprehensive performance of the axial flow pump and the key geometric parameters of the blade's uneven surface. This overcomes the problem of complex blade design. Blades designed based on the optimized key geometric parameters can improve the fluid flow inside the pump, reduce turbulent kinetic energy, improve flow separation and pressure pulsation, thereby reducing fluid energy loss inside the pump and achieving the high efficiency and low pressure pulsation requirements of axial flow pumps.

[0028] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0030] Figure 1 This is a technical roadmap of the present invention provided in the embodiments of the present invention.

[0031] Figure 2 This is a schematic diagram of the fluid domain and solid domain provided in the embodiments of the present invention.

[0032] Figure 3 This is a schematic diagram of the mesh division of the fluid domain and solid domain of an axial flow pump provided in an embodiment of the present invention.

[0033] Figure 4 This is an illustration of the key design parameters of the blade provided in the embodiments of the present invention.

[0034] Figure 5 This is a diagram showing the distribution of pressure pulsation monitoring points on the blade and the changes in pressure pulsation, as provided in an embodiment of the present invention.

[0035] Figure 6 This is a comparison diagram of external characteristics provided in the embodiments of the present invention.

[0036] Figure 7 This is a streamline diagram provided in an embodiment of the present invention.

[0037] Figure 8 This is a turbulent kinetic energy distribution diagram provided in an embodiment of the present invention.

[0038] Figure 9 This is a vortex structure distribution diagram provided in an embodiment of the present invention.

[0039] Figure 10This is a block diagram illustrating a high-efficiency, low-pressure pulsating axial flow pump blade design device according to an exemplary embodiment.

[0040] Figure 11 This is a block diagram illustrating an electronic device according to an exemplary embodiment. Detailed Implementation

[0041] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0042] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0043] Figure 1 This is a technical roadmap illustrating a high-efficiency, low-pressure pulsating axial flow pump blade design method according to an exemplary embodiment, such as... Figure 1 As shown, the method may include the following steps:

[0044] S1: Determine the structural design parameters of the axial flow pump according to the predetermined external characteristic requirements. The external characteristic requirements include head, efficiency, flow rate, and outlet pressure. The structural design parameters include impeller hub ratio, number of blades, angle of attack, blade density, and inlet and outlet diameters of the axial flow pump.

[0045] Specifically, the formula for calculating the head of an axial flow pump is:

[0046]

[0047] In the formula: P1 and P2 represent the liquid pressure at the pump inlet and outlet, C1 and C2 represent the fluid velocity at the pump inlet and outlet, and z1 and z2 represent the inlet and outlet installation heights. Let g be the density of the fluid medium and g be the local gravitational acceleration.

[0048] It should be noted that the selection of efficiency, flow rate, and outlet pressure, as well as the determination of impeller hub ratio, number of blades, angle of attack, blade density, and inlet and outlet diameters of axial flow pumps, are general procedures in pump design and can be selected based on experience, so they will not be elaborated here.

[0049] Determining the initial structural design parameters and performance parameters of the axial flow pump meets the requirements for 3D design and modeling of the axial flow pump, laying the foundation for subsequent steps.

[0050] S2: Based on the structural design parameters, establish a three-dimensional solid domain model of the axial flow pump, and extract the fluid domain based on the three-dimensional solid domain model of the axial flow pump. Perform numerical simulation calculations on the fluid domain. The numerical simulation calculations include external characteristic calculations, internal flow calculations, and pressure pulsation calculations for the axial flow pump under all operating conditions.

[0051] Specifically, based on the structural design parameters provided by S1, the 3D modeling software SolidWorks and SpaceClaim were used to establish 3D models of the solid domain and fluid domain respectively, according to the determined geometric design parameters, resulting in the attached figure. Figure 2 The three-dimensional models of the flow field and solid field are shown.

[0052] The flow and pressure pulsation calculations for the axial flow pump under full operating conditions are performed on the created 3D model of the flow field domain. Specifically:

[0053] The fluid domains were meshed using ICEM and TurboGrid software. All fluid domains employed structured meshes with refined boundary layers at the walls. The mesh generation process is as follows: Figure 3 As shown, CFX software and its batch processing commands were used to perform numerical simulation of the fluid domain model of the axial flow pump. The rotational speed, flow rate, and inlet pressure conditions were set according to the full operating conditions of the axial flow pump, and monitoring points were set to monitor pressure pulsation. CFD-POST software was used to analyze the streamline, turbulent kinetic energy distribution, and vortex structure distribution of the axial flow pump. Origin was used to process the external characteristics and compare the pressure pulsation.

[0054] Numerical simulation calculations were used to obtain the performance parameters of the axial flow pump that meet the requirements of high efficiency and low pressure pulsation under all operating conditions, but do not yet meet the requirements of high efficiency and low pressure pulsation. This provides an initial reference for the axial flow pump after subsequent blade optimization design.

[0055] S3: Analyze the results of the numerical simulation calculation, considering that the impeller structure plays an important role in the performance of the axial flow pump, optimize the key geometric parameters of the concave and convex surfaces of the axial flow pump blades based on the assumption of laminar flow independence of the cylinder and multi-curvature control, and set several sets of blade concave and convex surfaces. The key geometric parameters are the arrangement position, length, width, protrusion height and protrusion radius of the blade concave and convex surfaces.

[0056] Specifically, with other blade parameters remaining unchanged, the original blade is optimized based on the assumption of laminar flow independence of the cylinder and multi-curvature control. This is achieved by changing the key geometric parameters of the blade's concave and convex surfaces. These key geometric parameters include the arrangement position, lengths L1-L3, width L4, protrusion heights H1-H4, and protrusion radii R1-R4 of the concave and convex surfaces. The target parameters are illustrated below. Figure 4 As shown, several sets of design parameters for different blade surface textures were obtained. For axial flow pumps requiring high efficiency and low pressure pulsation, the impeller surface design needs to minimize flow losses and flow separation.

[0057] The concave and convex surfaces are arranged on the impeller suction surface. In cylindrical coordinates, the starting position is at 1 / 2R of the impeller and the ending position is at R of the impeller in the radial direction. In the circumferential direction, the starting position is at the leading edge of the impeller and the ending position is at the trailing edge of the impeller.

[0058] Where R is the radial length of the impeller.

[0059] The uneven surface includes, along the circumferential direction, each protrusion having a length of L1, L2, L3, and along the radial direction, a width of L4.

[0060] The three protrusions on the uneven surface have circumferential heights of H1, H2, and H3, and protrusion radii of R1, R2, and R3, respectively. Their radial height is H4, and protrusion radius is R4.

[0061] S4: Numerical simulation calculations are performed on axial flow pumps with several sets of blade concave and convex surfaces. Based on the comprehensive performance obtained from the numerical simulation calculations of the axial flow pumps and the optimal selection of key geometric parameters of the blade concave and convex surfaces, the design geometric parameters of the high-efficiency low-pressure pulsating axial flow pump blades based on multi-curvature control of the blade surface are obtained. The comprehensive performance includes external characteristics, internal flow performance, and pressure pulsation performance.

[0062] Specifically, CFX software was used to perform numerical simulations on the three-dimensional fluid domain model of the axial flow pump. Rotational speed, flow velocity, and inlet pressure conditions were set according to the full operating conditions of the axial flow pump, and monitoring points were established to monitor pressure pulsations. CFD-POST software was used to analyze the streamline, turbulent kinetic energy distribution, and vortex structure distribution of the axial flow pump. Origin was used to process and compare external characteristics and pressure pulsations. A comparative analysis method was employed to compare the head, efficiency, streamline, turbulent kinetic energy, and vortex structure correlation parameters obtained from the numerical simulation calculations of axial flow pumps with different blade surfaces (concave and convex). Based on this, the optimal selection of comprehensive performance and key geometric parameters of the blade surfaces (concave and convex) was determined.

[0063] Among them, the pressure pulsations obtained from monitoring are dimensionless, and the dimensionless coefficient C is used. P To characterize the intensity of pressure pulsation, C P The larger the value, the more intense the pressure pulsation. The calculation formula is as follows:

[0064]

[0065] Where P and These represent static pressure and its average value, respectively. U represents density, and u2 represents the outlet velocity at the outer edge of the impeller.

[0066] Based on the initial simulation data, multiple sets of comparisons were used to analyze the performance parameters obtained from the numerical simulation of the axial flow pump with blades optimized by multi-curvature. This determined the key geometric parameters of the optimal blade surface. The axial flow pump with the determined parameters can improve the flow of fluid inside the pump from the simulation perspective, improve flow separation, reduce vortex structure and pressure pulsation, and thus improve the pump head efficiency.

[0067] like Figure 5 The modified blades shown have significantly reduced pulsation intensity under standard operating conditions compared to the original blades, effectively reducing pressure pulsation inside the axial flow pump.

[0068] like Figure 6 The modified blade shown has significantly improved external characteristics compared to the original blade under all operating conditions, especially in the saddle area.

[0069] like Figure 7 The modified blade shown has a more uniform streamline distribution than the original blade under standard operating conditions, and the delayed flow separation point increases the uniform flow area.

[0070] like Figure 8 The modified blades shown have significantly reduced turbulent kinetic energy distribution compared to the original blades under standard operating conditions, resulting in reduced flow energy loss within the pump.

[0071] like Figure 9 The modified blades shown have a significantly reduced vortex structure distribution compared to the original blades under standard operating conditions, which can effectively reduce pressure pulsation inside the axial flow pump.

[0072] As can be seen from the above embodiments, this application determines several groups of blades with different concave and convex surfaces by changing the key geometric parameters of the blade's concave and convex surfaces, based on the assumption of laminar flow independence of the cylinder and multi-curvature control. Then, by comprehensively considering the optimal selection between the performance parameters such as the internal flow distribution, head, efficiency, pressure pulsation, and turbulent kinetic energy of all groups of axial flow pumps and the key geometric parameters of the blade's concave and convex surfaces, the optimal geometric design parameters of the axial flow pump blade's concave and convex surfaces that meet the requirements of high efficiency and low pressure pulsation are determined. The designed blades can improve the flow of fluid inside the pump, improve flow separation, reduce vortex structures and pressure pulsation, thereby improving the pump's head efficiency.

[0073] Corresponding to the aforementioned embodiments of the high-efficiency low-pressure pulsating axial flow pump blade design method, this application also provides embodiments of the high-efficiency low-pressure pulsating axial flow pump blade design device.

[0074] Figure 10 This is a block diagram illustrating a high-efficiency, low-pressure pulsating axial flow pump blade design device according to an exemplary embodiment. (Refer to...) Figure 10 The device includes:

[0075] Parameter determination module 1 is used to determine the structural design parameters of the axial flow pump according to predetermined external characteristic requirements. The external characteristic requirements include head, efficiency, flow rate, and outlet pressure. The structural design parameters include impeller hub ratio, number of blades, angle of attack, blade density, and inlet and outlet diameters of the axial flow pump.

[0076] Modeling and simulation module 2 is used to establish a three-dimensional model of the solid domain of the axial flow pump based on the structural design parameters, and to extract the fluid domain based on the three-dimensional model of the solid domain of the axial flow pump, and to perform numerical simulation calculations on the fluid domain. The numerical simulation calculations include the calculation of the external characteristics, internal flow and pressure pulsation of the axial flow pump under all working conditions.

[0077] The simulation result analysis module 3 is used to analyze the results of the numerical simulation calculation. Considering that the impeller structure plays an important role in the performance of the axial flow pump, the key geometric parameters of the concave and convex surfaces of the axial flow pump blades are optimized based on the assumption of laminar flow independence of the cylinder and multi-curvature control. Several sets of blade concave and convex surfaces are set. The key geometric parameters are the arrangement position, length, width, protrusion height and protrusion radius of the blade concave and convex surfaces.

[0078] Simulation optimization module 4 is used to perform numerical simulation calculations on axial flow pumps with several sets of blade concave and convex surfaces. Based on the comprehensive performance obtained from the numerical simulation calculation of the axial flow pump and the optimal selection of key geometric parameters of the blade concave and convex surfaces, the design geometric parameters of the high-efficiency low-pressure pulsating axial flow pump blade based on multi-curvature control of the blade surface are obtained. The comprehensive performance includes external characteristics, internal flow performance, and pressure pulsation performance.

[0079] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0080] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to in the description of the method embodiments. The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this application according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0081] Accordingly, this application also provides an electronic device, comprising: one or more processors; a memory for storing one or more programs; and, when the one or more programs are executed by the one or more processors, causing the one or more processors to implement the high-efficiency, low-pressure pulsating axial flow pump blade design method described above. Figure 11 The diagram shown is a hardware structure diagram of any data processing-capable device, including a high-efficiency, low-pressure pulsating axial flow pump blade design device provided in an embodiment of the present invention. Except for... Figure 11 In addition to the processor, memory, DMA controller, disk, and non-volatile memory shown, any data processing device in the embodiment may also include other hardware depending on the actual function of the data processing device, which will not be described in detail here.

[0082] Accordingly, this application also provides a computer-readable storage medium storing computer instructions that, when executed by a processor, implement the high-efficiency, low-pressure pulsating axial flow pump blade design method described above. The computer-readable storage medium can be an internal storage unit of any data-processing device as described in any of the foregoing embodiments, such as a hard disk or memory. The computer-readable storage medium can also be an external storage device, such as a plug-in hard disk, smart media card (SMC), SD card, flash card, etc., equipped on the device. Furthermore, the computer-readable storage medium can include both internal storage units of any data-processing device and external storage devices. The computer-readable storage medium is used to store the computer program and other programs and data required by the data-processing device, and can also be used to temporarily store data that has been output or will be output.

[0083] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0084] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for designing blades for a high-efficiency, low-pressure pulsating axial flow pump, characterized in that, include: The structural design parameters of the axial flow pump are determined according to the predetermined external characteristic requirements, which include head, efficiency, flow rate, and outlet pressure. The structural design parameters include impeller hub ratio, number of blades, angle of attack, blade density, and inlet and outlet diameters of the axial flow pump. Based on the structural design parameters, a three-dimensional solid domain model of the axial flow pump is established, and a fluid domain is extracted based on the three-dimensional solid domain model of the axial flow pump. Numerical simulation calculations are performed on the fluid domain, including external characteristic calculations, internal flow calculations, and pressure pulsation calculations for the axial flow pump under all operating conditions. The results of the numerical simulation calculations were analyzed. Considering that the impeller structure plays an important role in the performance of the axial flow pump, the key geometric parameters of the concave and convex surfaces of the axial flow pump blades were optimized based on the assumption of laminar flow independence of the cylinder and multi-curvature control. Several sets of blade concave and convex surfaces were set. The key geometric parameters are the arrangement position, length, width, protrusion height and protrusion radius of the blade concave and convex surfaces. Numerical simulation calculations were performed on several sets of axial flow pumps with concave and convex blade surfaces. Based on the comprehensive performance obtained from the numerical simulation calculations of the axial flow pumps and the optimal selection of key geometric parameters of the concave and convex blade surfaces, the design geometric parameters of the high-efficiency low-pressure pulsating axial flow pump blades based on multi-curvature control of the blade surface were obtained. The comprehensive performance includes external characteristics, internal flow performance, and pressure pulsation performance.

2. The method according to claim 1, characterized in that: Based on the structural design parameters, a three-dimensional model of the solid domain of the axial flow pump is established. Then, based on this three-dimensional model, the fluid domain is extracted, and numerical simulation calculations are performed on the fluid domain, including the following sub-steps: Based on the determined structural design parameters, a solid domain three-dimensional model is established. The fluid domain three-dimensional model is extracted from the solid domain three-dimensional model of the axial flow pump, and then the fluid domain three-dimensional model is meshed. After mesh generation, numerical simulation is performed on the three-dimensional model of the fluid domain. In the calculation of external characteristics and internal flow, the rotational speed, flow velocity and inlet pressure conditions are set according to the full operating conditions of the axial flow pump. In the calculation of pressure pulsation, monitoring points are set on the three-dimensional model of the fluid domain to monitor pressure pulsation. The streamlines, turbulent kinetic energy distribution, and vortex structure distribution of the axial flow pump are analyzed, and the external characteristics and pressure pulsation of different blade surfaces are compared.

3. The method according to claim 1, characterized in that: Numerical simulations were performed on several sets of axial flow pumps with uneven blade surfaces. Based on the comprehensive performance obtained from the numerical simulations and the optimal selection of key geometric parameters for the uneven blade surfaces, the following were considered: Numerical simulation calculations were performed on several groups of axial flow pumps with concave and convex blade surfaces. The head, efficiency, streamline, turbulent kinetic energy and vortex structure correlation parameters obtained from the numerical simulation calculations of axial flow pumps with different concave and convex blade surfaces were compared using a comparative analysis method. Based on this, the optimal selection of comprehensive performance and key geometric parameters of the concave and convex blade surfaces was determined. The comprehensive performance includes external characteristics, internal flow performance and pressure pulsation performance.

4. A high-efficiency, low-pressure pulsating axial flow pump blade design device, characterized in that, include: The parameter determination module is used to determine the structural design parameters of the axial flow pump according to predetermined external characteristic requirements. The external characteristic requirements include head, efficiency, flow rate, and outlet pressure. The structural design parameters include impeller hub ratio, number of blades, angle of attack, blade density, and inlet and outlet diameters of the axial flow pump. The modeling and simulation module is used to establish a three-dimensional solid domain model of the axial flow pump based on the structural design parameters, and to extract the fluid domain based on the three-dimensional solid domain model of the axial flow pump, and to perform numerical simulation calculations on the fluid domain. The numerical simulation calculations include external characteristic calculations, internal flow calculations, and pressure pulsation calculations for the axial flow pump under all operating conditions. The simulation result analysis module is used to analyze the results of the numerical simulation calculation. Considering that the impeller structure plays an important role in the performance of the axial flow pump, the key geometric parameters of the concave and convex surfaces of the axial flow pump blades are optimized based on the assumption of laminar flow independence of the cylinder and multi-curvature control. Several sets of blade concave and convex surfaces are set. The key geometric parameters are the arrangement position, length, width, protrusion height and protrusion radius of the blade concave and convex surfaces. The simulation optimization module is used to perform numerical simulation calculations on axial flow pumps with several sets of blade concave and convex surfaces. Based on the comprehensive performance obtained from the numerical simulation calculation of the axial flow pump and the optimal selection of key geometric parameters of the blade concave and convex surfaces, the design geometric parameters of the high-efficiency low-pressure pulsating axial flow pump blade based on multi-curvature control of the blade surface are obtained. The comprehensive performance includes external characteristics, internal flow performance, and pressure pulsation performance.

5. An electronic device, characterized in that, include: One or more processors; Memory, used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method as described in any one of claims 1-3.

6. A computer-readable storage medium storing computer instructions thereon, characterized in that, When executed by the processor, this instruction implements the steps of the method as described in any one of claims 1-3.

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